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:pencil2: Leetcode Solutions with Cpp,Javascript,Python

Update time: 2018-09-12 22:01:06

I have solved 203 / 851 problems while there are 139 problems still locked.

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#	Title	Source Code	Article	Difficulty
1	two-sum	Javascript	:memo:	Easy
2	add-two-numbers	Javascript	:memo:	Medium
3	longest-substring-without-repeating-characters	Javascript	:memo:	Medium
4	median-of-two-sorted-arrays	Javascript	:memo:	Hard
5	longest-palindromic-substring	Javascript	:memo:	Medium
6	zigzag-conversion	Javascript	:memo:	Medium
7	reverse-integer	Javascript	:memo:	Easy
8	string-to-integer-atoi	Javascript		Medium
9	palindrome-number	Javascript	:memo:	Easy
10	regular-expression-matching	Javascript	:memo:	Hard
11	container-with-most-water	Javascript	:memo:	Medium
12	integer-to-roman	Javascript		Medium
13	roman-to-integer	Javascript		Easy
14	longest-common-prefix	Javascript	:memo:	Easy
15	3sum	Javascript		Medium
16	3sum-closest	Javascript		Medium
17	letter-combinations-of-a-phone-number	Javascript		Medium
18	4sum	Javascript		Medium
19	remove-nth-node-from-end-of-list	Javascript	:memo:	Medium
20	valid-parentheses	Javascript		Easy
21	merge-two-sorted-lists	Javascript	:memo:	Easy
22	generate-parentheses	Javascript	:memo:	Medium
23	merge-k-sorted-lists	Javascript	:memo:	Hard
24	swap-nodes-in-pairs	Javascript		Medium
25	reverse-nodes-in-k-group	Javascript		Hard
26	remove-duplicates-from-sorted-array	Javascript	:memo:	Easy
27	remove-element	Javascript	:memo:	Easy
28	implement-strstr	Javascript Cpp		Easy
29	divide-two-integers	Javascript		Medium
30	substring-with-concatenation-of-all-words	Javascript		Hard
31	next-permutation	Javascript	:memo:	Medium
32	longest-valid-parentheses	Javascript	:memo:	Hard
33	search-in-rotated-sorted-array	Javascript		Medium
34	find-first-and-last-position-of-element-in-sorted-array	Javascript	:memo:	Medium
35	search-insert-position	Javascript		Easy
36	valid-sudoku	Javascript		Medium
37	sudoku-solver	Javascript		Hard
38	count-and-say	Javascript		Easy
39	combination-sum	Javascript		Medium
40	combination-sum-ii	Javascript		Medium
41	first-missing-positive	Javascript		Hard
42	trapping-rain-water	Javascript	:memo:	Hard
43	multiply-strings	Javascript		Medium
44	wildcard-matching	Javascript		Hard
45	jump-game-ii	Javascript		Hard
46	permutations	Javascript		Medium
47	permutations-ii	Javascript		Medium
48	rotate-image	Python Javascript		Medium
49	group-anagrams	Javascript	:memo:	Medium
50	powx-n	Javascript	:memo:	Medium
51	n-queens	Javascript		Hard
52	n-queens-ii	Javascript		Hard
53	maximum-subarray	Javascript		Easy
54	spiral-matrix	Javascript	:memo:	Medium
55	jump-game	Javascript	:memo:	Medium
56	merge-intervals	Javascript	:memo:	Medium
57	insert-interval	Javascript		Hard
58	length-of-last-word	Javascript		Easy
59	spiral-matrix-ii	Javascript		Medium
60	permutation-sequence	Javascript		Medium
61	rotate-list	Javascript		Medium
62	unique-paths	Javascript		Medium
63	unique-paths-ii	Javascript		Medium
64	minimum-path-sum	Javascript	:memo:	Medium
65	valid-number	Javascript		Hard
66	plus-one	Javascript		Easy
67	add-binary	Javascript		Easy
68	text-justification	Javascript		Hard
69	sqrtx	Javascript		Easy
70	climbing-stairs	Javascript	:memo:	Easy
71	simplify-path	Javascript		Medium
72	edit-distance	Javascript		Hard
73	set-matrix-zeroes	Javascript		Medium
74	search-a-2d-matrix	Javascript		Medium
75	sort-colors	Javascript		Medium
76	minimum-window-substring	Javascript	:memo:	Hard
77	combinations	Javascript		Medium
78	subsets	Javascript		Medium
79	word-search	Javascript		Medium
80	remove-duplicates-from-sorted-array-ii	Javascript		Medium
81	search-in-rotated-sorted-array-ii	Javascript		Medium
82	remove-duplicates-from-sorted-list-ii	Javascript		Medium
83	remove-duplicates-from-sorted-list	Javascript	:memo:	Easy
84	largest-rectangle-in-histogram	Javascript	:memo:	Hard
85	maximal-rectangle	Javascript		Hard
86	partition-list	Javascript		Medium
87	scramble-string	Javascript		Hard
88	merge-sorted-array	Javascript		Easy
89	gray-code	Javascript		Medium
90	subsets-ii	Javascript		Medium
91	decode-ways	Javascript		Medium
92	reverse-linked-list-ii	Javascript		Medium
93	restore-ip-addresses	Javascript		Medium
94	binary-tree-inorder-traversal	Javascript	:memo:	Medium
95	unique-binary-search-trees-ii	Javascript		Medium
96	unique-binary-search-trees	Javascript	:memo:	Medium
97	interleaving-string	Javascript	:memo:	Hard
98	validate-binary-search-tree	Javascript		Medium
99	recover-binary-search-tree	Javascript		Hard
100	same-tree	Javascript		Easy
101	symmetric-tree	Javascript	:memo:	Easy
102	binary-tree-level-order-traversal	Javascript		Medium
103	binary-tree-zigzag-level-order-traversal	Javascript		Medium
104	maximum-depth-of-binary-tree	Javascript		Easy
105	construct-binary-tree-from-preorder-and-inorder-traversal	Javascript		Medium
106	construct-binary-tree-from-inorder-and-postorder-traversal	Javascript		Medium
107	binary-tree-level-order-traversal-ii	Javascript		Easy
108	convert-sorted-array-to-binary-search-tree	Javascript		Easy
109	convert-sorted-list-to-binary-search-tree	Javascript		Medium
110	balanced-binary-tree	Javascript		Easy
111	minimum-depth-of-binary-tree	Javascript		Easy
112	path-sum	Javascript		Easy
113	path-sum-ii	Javascript		Medium
114	flatten-binary-tree-to-linked-list	Javascript		Medium
115	distinct-subsequences	Cpp		Hard
116	populating-next-right-pointers-in-each-node	Cpp		Medium
117	populating-next-right-pointers-in-each-node-ii	Cpp		Medium
118	pascals-triangle	Cpp	:memo:	Easy
119	pascals-triangle-ii	Cpp		Easy
120	triangle	Cpp		Medium
121	best-time-to-buy-and-sell-stock	Javascript Cpp	:memo:	Easy
122	best-time-to-buy-and-sell-stock-ii	Cpp	:memo:	Easy
123	best-time-to-buy-and-sell-stock-iii	Cpp		Hard
124	binary-tree-maximum-path-sum	Cpp		Hard
125	valid-palindrome	Cpp		Easy
126	word-ladder-ii	Cpp		Hard
127	word-ladder	Cpp		Medium
128	longest-consecutive-sequence	Cpp	:memo:	Hard
129	sum-root-to-leaf-numbers	Cpp		Medium
130	surrounded-regions	Cpp		Medium
131	palindrome-partitioning	Cpp		Medium
132	palindrome-partitioning-ii	Cpp		Hard
133	clone-graph	Cpp		Medium
134	gas-station	Cpp		Medium
135	candy	Cpp	:memo:	Hard
136	single-number	Cpp	:memo:	Easy
137	single-number-ii	Cpp		Medium
138	copy-list-with-random-pointer	Cpp	:memo:	Medium
139	word-break	Cpp	:memo:	Medium
140	word-break-ii	Cpp	:memo:	Hard
141	linked-list-cycle	Cpp	:memo:	Easy
142	linked-list-cycle-ii	Cpp	:memo:	Medium
143	reorder-list	Cpp		Medium
144	binary-tree-preorder-traversal	Cpp		Medium
145	binary-tree-postorder-traversal	Cpp		Hard
146	lru-cache	Cpp		Hard
147	insertion-sort-list	Cpp		Medium
148	sort-list	Cpp		Medium
149	max-points-on-a-line	Cpp		Hard
150	evaluate-reverse-polish-notation	Cpp		Medium
151	reverse-words-in-a-string	Cpp		Medium
152	maximum-product-subarray	Cpp		Medium
153	find-minimum-in-rotated-sorted-array	Cpp	:memo:	Medium
154	find-minimum-in-rotated-sorted-array-ii	Cpp		Hard
155	min-stack	Cpp		Easy
156	binary-tree-upside-down	:lock:		Medium
157	read-n-characters-given-read4	:lock:		Easy
158	read-n-characters-given-read4-ii-call-multiple-times	:lock:		Hard
159	longest-substring-with-at-most-two-distinct-characters	:lock:		Hard
160	intersection-of-two-linked-lists	Cpp	:memo:	Easy
161	one-edit-distance	:lock:		Medium
162	find-peak-element	Cpp	:memo:	Medium
163	missing-ranges	:lock:		Medium
164	maximum-gap	Cpp	:memo:	Hard
165	compare-version-numbers	Javascript Cpp		Medium
166	fraction-to-recurring-decimal	Cpp	:memo:	Medium
167	two-sum-ii-input-array-is-sorted	Cpp	:memo:	Easy
168	excel-sheet-column-title	Cpp		Easy
169	majority-element	Javascript Cpp	:memo:	Easy
170	two-sum-iii-data-structure-design	:lock:		Easy
171	excel-sheet-column-number	Cpp		Easy
172	factorial-trailing-zeroes	Cpp		Easy
173	binary-search-tree-iterator	Cpp		Medium
174	dungeon-game	Cpp		Hard
179	largest-number	Cpp	:memo:	Medium
186	reverse-words-in-a-string-ii	:lock:		Medium
187	repeated-dna-sequences	Cpp		Medium
188	best-time-to-buy-and-sell-stock-iv	Cpp		Hard
189	rotate-array	Javascript Cpp	:memo:	Easy
190	reverse-bits	Javascript Cpp		Easy
191	number-of-1-bits	Javascript Cpp	:memo:	Easy
198	house-robber	Cpp	:memo:	Easy
199	binary-tree-right-side-view	Cpp	:memo:	Medium
200	number-of-islands	Cpp	:memo:	Medium
201	bitwise-and-of-numbers-range	Cpp		Medium
202	happy-number	Cpp		Easy
203	remove-linked-list-elements	Cpp		Easy
204	count-primes	Cpp		Easy
205	isomorphic-strings	Javascript Cpp		Easy
206	reverse-linked-list	Cpp	:memo:	Easy
207	course-schedule	Cpp		Medium
208	implement-trie-prefix-tree	Cpp	:memo:	Medium
209	minimum-size-subarray-sum	Cpp	:memo:	Medium
210	course-schedule-ii	Cpp		Medium
211	add-and-search-word-data-structure-design	Cpp		Medium
212	word-search-ii	Cpp		Hard
213	house-robber-ii	Cpp		Medium
214	shortest-palindrome	Cpp	:memo:	Hard
215	kth-largest-element-in-an-array	Cpp		Medium
216	combination-sum-iii	Cpp		Medium
217	contains-duplicate	Javascript Cpp	:memo:	Easy
218	the-skyline-problem	Cpp		Hard
219	contains-duplicate-ii	Javascript Cpp	:memo:	Easy
220	contains-duplicate-iii	Cpp	:memo:	Medium
221	maximal-square	Cpp	:memo:	Medium
222	count-complete-tree-nodes	Cpp		Medium
223	rectangle-area	Cpp		Medium
224	basic-calculator	Cpp		Hard
225	implement-stack-using-queues	Javascript	:memo:	Easy
226	invert-binary-tree		:memo:	Easy
227	basic-calculator-ii			Medium
228	summary-ranges		:memo:	Medium
229	majority-element-ii			Medium
230	kth-smallest-element-in-a-bst			Medium
231	power-of-two			Easy
232	implement-queue-using-stacks		:memo:	Easy
233	number-of-digit-one		:memo:	Hard
234	palindrome-linked-list			Easy
235	lowest-common-ancestor-of-a-binary-search-tree			Easy
236	lowest-common-ancestor-of-a-binary-tree			Medium
237	delete-node-in-a-linked-list		:memo:	Easy
238	product-of-array-except-self			Medium
239	sliding-window-maximum			Hard
240	search-a-2d-matrix-ii		:memo:	Medium
241	different-ways-to-add-parentheses			Medium
242	valid-anagram		:memo:	Easy
243	shortest-word-distance	:lock:	:memo:	Easy
244	shortest-word-distance-ii	:lock:		Medium
245	shortest-word-distance-iii	:lock:		Medium
246	strobogrammatic-number	:lock:		Easy
247	strobogrammatic-number-ii	:lock:		Medium
248	strobogrammatic-number-iii	:lock:		Hard
249	group-shifted-strings	:lock:		Medium
250	count-univalue-subtrees	:lock:		Medium
251	flatten-2d-vector	:lock:		Medium
252	meeting-rooms	:lock:	:memo:	Easy
253	meeting-rooms-ii	:lock:	:memo:	Medium
254	factor-combinations	:lock:		Medium
255	verify-preorder-sequence-in-binary-search-tree	:lock:		Medium
256	paint-house	:lock:		Easy
257	binary-tree-paths			Easy
258	add-digits			Easy
259	3sum-smaller	:lock:	:memo:	Medium
260	single-number-iii			Medium
261	graph-valid-tree	:lock:		Medium
263	ugly-number			Easy
264	ugly-number-ii			Medium
265	paint-house-ii	:lock:		Hard
266	palindrome-permutation	:lock:	:memo:	Easy
267	palindrome-permutation-ii	:lock:	:memo:	Medium
268	missing-number		:memo:	Easy
269	alien-dictionary	:lock:		Hard
270	closest-binary-search-tree-value	:lock:		Easy
271	encode-and-decode-strings	:lock:		Medium
272	closest-binary-search-tree-value-ii	:lock:		Hard
273	integer-to-english-words			Hard
274	h-index		:memo:	Medium
275	h-index-ii			Medium
276	paint-fence	:lock:		Easy
277	find-the-celebrity	:lock:		Medium
278	first-bad-version		:memo:	Easy
279	perfect-squares			Medium
280	wiggle-sort	:lock:	:memo:	Medium
281	zigzag-iterator	:lock:		Medium
282	expression-add-operators		:memo:	Hard
283	move-zeroes		:memo:	Easy
284	peeking-iterator			Medium
285	inorder-successor-in-bst	:lock:		Medium
286	walls-and-gates	:lock:	:memo:	Medium
287	find-the-duplicate-number		:memo:	Medium
288	unique-word-abbreviation	:lock:	:memo:	Medium
289	game-of-life			Medium
290	word-pattern			Easy
291	word-pattern-ii	:lock:		Hard
292	nim-game		:memo:	Easy
293	flip-game	:lock:		Easy
294	flip-game-ii	:lock:		Medium
295	find-median-from-data-stream		:memo:	Hard
296	best-meeting-point	:lock:	:memo:	Hard
297	serialize-and-deserialize-binary-tree			Hard
298	binary-tree-longest-consecutive-sequence	:lock:	:memo:	Medium
299	bulls-and-cows			Medium
300	longest-increasing-subsequence		:memo:	Medium
301	remove-invalid-parentheses			Hard
302	smallest-rectangle-enclosing-black-pixels	:lock:	:memo:	Hard
303	range-sum-query-immutable		:memo:	Easy
304	range-sum-query-2d-immutable		:memo:	Medium
305	number-of-islands-ii	:lock:	:memo:	Hard
306	additive-number			Medium
307	range-sum-query-mutable		:memo:	Medium
308	range-sum-query-2d-mutable	:lock:		Hard
309	best-time-to-buy-and-sell-stock-with-cooldown			Medium
310	minimum-height-trees			Medium
311	sparse-matrix-multiplication	:lock:		Medium
312	burst-balloons			Hard
313	super-ugly-number			Medium
314	binary-tree-vertical-order-traversal	:lock:		Medium
315	count-of-smaller-numbers-after-self			Hard
316	remove-duplicate-letters			Hard
317	shortest-distance-from-all-buildings	:lock:		Hard
318	maximum-product-of-word-lengths			Medium
319	bulb-switcher			Medium
320	generalized-abbreviation	:lock:	:memo:	Medium
321	create-maximum-number			Hard
322	coin-change		:memo:	Medium
323	number-of-connected-components-in-an-undirected-graph	:lock:		Medium
324	wiggle-sort-ii			Medium
325	maximum-size-subarray-sum-equals-k	:lock:		Medium
326	power-of-three		:memo:	Easy
327	count-of-range-sum			Hard
328	odd-even-linked-list		:memo:	Medium
329	longest-increasing-path-in-a-matrix		:memo:	Hard
330	patching-array		:memo:	Hard
331	verify-preorder-serialization-of-a-binary-tree			Medium
332	reconstruct-itinerary			Medium
333	largest-bst-subtree	:lock:		Medium
334	increasing-triplet-subsequence			Medium
335	self-crossing			Hard
336	palindrome-pairs			Hard
337	house-robber-iii			Medium
338	counting-bits		:memo:	Medium
339	nested-list-weight-sum	:lock:	:memo:	Easy
340	longest-substring-with-at-most-k-distinct-characters	:lock:		Hard
341	flatten-nested-list-iterator			Medium
342	power-of-four			Easy
343	integer-break			Medium
344	reverse-string			Easy
345	reverse-vowels-of-a-string			Easy
346	moving-average-from-data-stream	:lock:		Easy
347	top-k-frequent-elements			Medium
348	design-tic-tac-toe	:lock:		Medium
349	intersection-of-two-arrays			Easy
350	intersection-of-two-arrays-ii			Easy
351	android-unlock-patterns	:lock:	:memo:	Medium
352	data-stream-as-disjoint-intervals			Hard
353	design-snake-game	:lock:		Medium
354	russian-doll-envelopes			Hard
355	design-twitter			Medium
356	line-reflection	:lock:		Medium
357	count-numbers-with-unique-digits			Medium
358	rearrange-string-k-distance-apart	:lock:		Hard
359	logger-rate-limiter	:lock:		Easy
360	sort-transformed-array	:lock:		Medium
361	bomb-enemy	:lock:		Medium
362	design-hit-counter	:lock:		Medium
363	max-sum-of-rectangle-no-larger-than-k			Hard
364	nested-list-weight-sum-ii	:lock:		Medium
365	water-and-jug-problem			Medium
366	find-leaves-of-binary-tree	:lock:		Medium
367	valid-perfect-square			Easy
368	largest-divisible-subset			Medium
369	plus-one-linked-list	:lock:		Medium
370	range-addition	:lock:	:memo:	Medium
371	sum-of-two-integers	Cpp		Easy
372	super-pow			Medium
373	find-k-pairs-with-smallest-sums			Medium
374	guess-number-higher-or-lower	Cpp	:memo:	Easy
375	guess-number-higher-or-lower-ii		:memo:	Medium
376	wiggle-subsequence		:memo:	Medium
377	combination-sum-iv			Medium
378	kth-smallest-element-in-a-sorted-matrix			Medium
379	design-phone-directory	:lock:		Medium
380	insert-delete-getrandom-o1			Medium
381	insert-delete-getrandom-o1-duplicates-allowed			Hard
382	linked-list-random-node			Medium
383	ransom-note			Easy
384	shuffle-an-array		:memo:	Medium
385	mini-parser			Medium
386	lexicographical-numbers			Medium
387	first-unique-character-in-a-string			Easy
388	longest-absolute-file-path			Medium
389	find-the-difference			Easy
390	elimination-game			Medium
391	perfect-rectangle			Hard
392	is-subsequence			Medium
393	utf-8-validation			Medium
394	decode-string			Medium
395	longest-substring-with-at-least-k-repeating-characters			Medium
396	rotate-function			Medium
397	integer-replacement			Medium
398	random-pick-index			Medium
399	evaluate-division			Medium
400	nth-digit			Easy
401	binary-watch			Easy
402	remove-k-digits			Medium
403	frog-jump		:memo:	Hard
404	sum-of-left-leaves			Easy
405	convert-a-number-to-hexadecimal			Easy
406	queue-reconstruction-by-height			Medium
407	trapping-rain-water-ii			Hard
408	valid-word-abbreviation	:lock:		Easy
409	longest-palindrome		:memo:	Easy
410	split-array-largest-sum		:memo:	Hard
411	minimum-unique-word-abbreviation	:lock:		Hard
412	fizz-buzz			Easy
413	arithmetic-slices		:memo:	Medium
414	third-maximum-number			Easy
415	add-strings			Easy
416	partition-equal-subset-sum			Medium
417	pacific-atlantic-water-flow			Medium
418	sentence-screen-fitting	:lock:		Medium
419	battleships-in-a-board			Medium
420	strong-password-checker			Hard
421	maximum-xor-of-two-numbers-in-an-array			Medium
422	valid-word-square	:lock:		Easy
423	reconstruct-original-digits-from-english			Medium
424	longest-repeating-character-replacement			Medium
425	word-squares	:lock:		Hard
432	all-oone-data-structure			Hard
433	minimum-genetic-mutation			Medium
434	number-of-segments-in-a-string		:memo:	Easy
435	non-overlapping-intervals		:memo:	Medium
436	find-right-interval		:memo:	Medium
437	path-sum-iii			Easy
438	find-all-anagrams-in-a-string			Easy
439	ternary-expression-parser	:lock:		Medium
440	k-th-smallest-in-lexicographical-order			Hard
441	arranging-coins			Easy
442	find-all-duplicates-in-an-array			Medium
443	string-compression		:memo:	Easy
444	sequence-reconstruction	:lock:		Medium
445	add-two-numbers-ii			Medium
446	arithmetic-slices-ii-subsequence		:memo:	Hard
447	number-of-boomerangs			Easy
448	find-all-numbers-disappeared-in-an-array			Easy
449	serialize-and-deserialize-bst			Medium
450	delete-node-in-a-bst			Medium
451	sort-characters-by-frequency			Medium
452	minimum-number-of-arrows-to-burst-balloons			Medium
453	minimum-moves-to-equal-array-elements		:memo:	Easy
454	4sum-ii			Medium
455	assign-cookies			Easy
456	132-pattern		:memo:	Medium
457	circular-array-loop			Medium
458	poor-pigs			Easy
459	repeated-substring-pattern			Easy
460	lfu-cache			Hard
461	hamming-distance			Easy
462	minimum-moves-to-equal-array-elements-ii		:memo:	Medium
463	island-perimeter			Easy
464	can-i-win			Medium
465	optimal-account-balancing	:lock:		Hard
466	count-the-repetitions		:memo:	Hard
467	unique-substrings-in-wraparound-string			Medium
468	validate-ip-address			Medium
469	convex-polygon	:lock:		Medium
471	encode-string-with-shortest-length	:lock:		Hard
472	concatenated-words			Hard
473	matchsticks-to-square		:memo:	Medium
474	ones-and-zeroes		:memo:	Medium
475	heaters			Easy
476	number-complement			Easy
477	total-hamming-distance		:memo:	Medium
479	largest-palindrome-product			Easy
480	sliding-window-median		:memo:	Hard
481	magical-string			Medium
482	license-key-formatting			Easy
483	smallest-good-base			Hard
484	find-permutation	:lock:	:memo:	Medium
485	max-consecutive-ones			Easy
486	predict-the-winner		:memo:	Medium
487	max-consecutive-ones-ii	:lock:		Medium
488	zuma-game			Hard
490	the-maze	:lock:	:memo:	Medium
491	increasing-subsequences			Medium
492	construct-the-rectangle			Easy
493	reverse-pairs		:memo:	Hard
494	target-sum		:memo:	Medium
495	teemo-attacking			Medium
496	next-greater-element-i		:memo:	Easy
498	diagonal-traverse			Medium
499	the-maze-iii	:lock:		Hard
500	keyboard-row			Easy
501	find-mode-in-binary-search-tree			Easy
502	ipo			Hard
503	next-greater-element-ii		:memo:	Medium
504	base-7			Easy
505	the-maze-ii	:lock:	:memo:	Medium
506	relative-ranks			Easy
507	perfect-number		:memo:	Easy
508	most-frequent-subtree-sum			Medium
513	find-bottom-left-tree-value			Medium
514	freedom-trail			Hard
515	find-largest-value-in-each-tree-row			Medium
516	longest-palindromic-subsequence			Medium
517	super-washing-machines			Hard
518	coin-change-2			Medium
520	detect-capital			Easy
521	longest-uncommon-subsequence-i		:memo:	Easy
522	longest-uncommon-subsequence-ii		:memo:	Medium
523	continuous-subarray-sum		:memo:	Medium
524	longest-word-in-dictionary-through-deleting		:memo:	Medium
525	contiguous-array		:memo:	Medium
526	beautiful-arrangement		:memo:	Medium
527	word-abbreviation	:lock:	:memo:	Hard
529	minesweeper			Medium
530	minimum-absolute-difference-in-bst			Easy
531	lonely-pixel-i	:lock:		Medium
532	k-diff-pairs-in-an-array			Easy
533	lonely-pixel-ii	:lock:		Medium
535	encode-and-decode-tinyurl		:memo:	Medium
536	construct-binary-tree-from-string	:lock:		Medium
537	complex-number-multiplication		:memo:	Medium
538	convert-bst-to-greater-tree		:memo:	Easy
539	minimum-time-difference			Medium
540	single-element-in-a-sorted-array			Medium
541	reverse-string-ii		:memo:	Easy
542	01-matrix		:memo:	Medium
543	diameter-of-binary-tree		:memo:	Easy
544	output-contest-matches	:lock:	:memo:	Medium
545	boundary-of-binary-tree	:lock:	:memo:	Medium
546	remove-boxes		:memo:	Hard
547	friend-circles		:memo:	Medium
548	split-array-with-equal-sum	:lock:	:memo:	Medium
549	binary-tree-longest-consecutive-sequence-ii	:lock:	:memo:	Medium
551	student-attendance-record-i		:memo:	Easy
552	student-attendance-record-ii		:memo:	Hard
553	optimal-division		:memo:	Medium
554	brick-wall		:memo:	Medium
555	split-concatenated-strings	:lock:	:memo:	Medium
556	next-greater-element-iii		:memo:	Medium
557	reverse-words-in-a-string-iii		:memo:	Easy
560	subarray-sum-equals-k		:memo:	Medium
561	array-partition-i		:memo:	Easy
562	longest-line-of-consecutive-one-in-matrix	:lock:	:memo:	Medium
563	binary-tree-tilt		:memo:	Easy
564	find-the-closest-palindrome		:memo:	Hard
565	array-nesting		:memo:	Medium
566	reshape-the-matrix		:memo:	Easy
567	permutation-in-string		:memo:	Medium
568	maximum-vacation-days	:lock:	:memo:	Hard
572	subtree-of-another-tree		:memo:	Easy
573	squirrel-simulation	:lock:	:memo:	Medium
575	distribute-candies		:memo:	Easy
576	out-of-boundary-paths		:memo:	Medium
581	shortest-unsorted-continuous-subarray		:memo:	Easy
582	kill-process	:lock:	:memo:	Medium
583	delete-operation-for-two-strings		:memo:	Medium
587	erect-the-fence		:memo:	Hard
588	design-in-memory-file-system	:lock:	:memo:	Hard
591	tag-validator		:memo:	Hard
592	fraction-addition-and-subtraction		:memo:	Medium
593	valid-square		:memo:	Medium
594	longest-harmonious-subsequence		:memo:	Easy
598	range-addition-ii		:memo:	Easy
599	minimum-index-sum-of-two-lists		:memo:	Easy
600	non-negative-integers-without-consecutive-ones		:memo:	Hard
604	design-compressed-string-iterator	:lock:	:memo:	Easy
605	can-place-flowers		:memo:	Easy
606	construct-string-from-binary-tree		:memo:	Easy
609	find-duplicate-file-in-system		:memo:	Medium
611	valid-triangle-number		:memo:	Medium
616	add-bold-tag-in-string	:lock:	:memo:	Medium
617	merge-two-binary-trees		:memo:	Easy
621	task-scheduler		:memo:	Medium
623	add-one-row-to-tree		:memo:	Medium
624	maximum-distance-in-arrays	:lock:	:memo:	Easy
625	minimum-factorization	:lock:	:memo:	Medium
628	maximum-product-of-three-numbers		:memo:	Easy
629	k-inverse-pairs-array		:memo:	Hard
630	course-schedule-iii		:memo:	Hard
631	design-excel-sum-formula	:lock:	:memo:	Hard
632	smallest-range		:memo:	Hard
633	sum-of-square-numbers		:memo:	Easy
634	find-the-derangement-of-an-array	:lock:	:memo:	Medium
635	design-log-storage-system	:lock:	:memo:	Medium
636	exclusive-time-of-functions		:memo:	Medium
637	average-of-levels-in-binary-tree		:memo:	Easy
638	shopping-offers		:memo:	Medium
639	decode-ways-ii		:memo:	Hard
640	solve-the-equation		:memo:	Medium
642	design-search-autocomplete-system	:lock:	:memo:	Hard
643	maximum-average-subarray-i		:memo:	Easy
644	maximum-average-subarray-ii	:lock:	:memo:	Hard
645	set-mismatch		:memo:	Easy
646	maximum-length-of-pair-chain		:memo:	Medium
647	palindromic-substrings		:memo:	Medium
648	replace-words		:memo:	Medium
649	dota2-senate		:memo:	Medium
650	2-keys-keyboard		:memo:	Medium
651	4-keys-keyboard	:lock:	:memo:	Medium
652	find-duplicate-subtrees		:memo:	Medium
653	two-sum-iv-input-is-a-bst		:memo:	Easy
654	maximum-binary-tree		:memo:	Medium
655	print-binary-tree		:memo:	Medium
656	coin-path	:lock:	:memo:	Hard
657	robot-return-to-origin		:memo:	Easy
658	find-k-closest-elements		:memo:	Medium
659	split-array-into-consecutive-subsequences		:memo:	Medium
660	remove-9	:lock:	:memo:	Hard
661	image-smoother		:memo:	Easy
662	maximum-width-of-binary-tree		:memo:	Medium
663	equal-tree-partition	:lock:	:memo:	Medium
664	strange-printer		:memo:	Hard
665	non-decreasing-array		:memo:	Easy
666	path-sum-iv	:lock:	:memo:	Medium
667	beautiful-arrangement-ii		:memo:	Medium
668	kth-smallest-number-in-multiplication-table		:memo:	Hard
669	trim-a-binary-search-tree		:memo:	Easy
670	maximum-swap		:memo:	Medium
671	second-minimum-node-in-a-binary-tree		:memo:	Easy
672	bulb-switcher-ii		:memo:	Medium
673	number-of-longest-increasing-subsequence		:memo:	Medium
674	longest-continuous-increasing-subsequence		:memo:	Easy
675	cut-off-trees-for-golf-event		:memo:	Hard
676	implement-magic-dictionary		:memo:	Medium
677	map-sum-pairs		:memo:	Medium
678	valid-parenthesis-string		:memo:	Medium
679	24-game		:memo:	Hard
680	valid-palindrome-ii		:memo:	Easy
681	next-closest-time	:lock:	:memo:	Medium
682	baseball-game		:memo:	Easy
683	k-empty-slots	:lock:	:memo:	Hard
684	redundant-connection		:memo:	Medium
685	redundant-connection-ii		:memo:	Hard
686	repeated-string-match		:memo:	Easy
687	longest-univalue-path		:memo:	Easy
688	knight-probability-in-chessboard		:memo:	Medium
689	maximum-sum-of-3-non-overlapping-subarrays		:memo:	Hard
690	employee-importance		:memo:	Easy
691	stickers-to-spell-word		:memo:	Hard
692	top-k-frequent-words		:memo:	Medium
693	binary-number-with-alternating-bits		:memo:	Easy
694	number-of-distinct-islands	:lock:	:memo:	Medium
695	max-area-of-island		:memo:	Easy
696	count-binary-substrings		:memo:	Easy
697	degree-of-an-array		:memo:	Easy
698	partition-to-k-equal-sum-subsets		:memo:	Medium
699	falling-squares		:memo:	Hard
711	number-of-distinct-islands-ii	:lock:	:memo:	Hard
712	minimum-ascii-delete-sum-for-two-strings		:memo:	Medium
713	subarray-product-less-than-k		:memo:	Medium
714	best-time-to-buy-and-sell-stock-with-transaction-fee		:memo:	Medium
715	range-module		:memo:	Hard
716	max-stack	:lock:	:memo:	Hard
717	1-bit-and-2-bit-characters		:memo:	Easy
718	maximum-length-of-repeated-subarray		:memo:	Medium
719	find-k-th-smallest-pair-distance		:memo:	Hard
720	longest-word-in-dictionary		:memo:	Easy
721	accounts-merge		:memo:	Medium
722	remove-comments		:memo:	Medium
723	candy-crush	:lock:	:memo:	Medium
724	find-pivot-index		:memo:	Easy
725	split-linked-list-in-parts		:memo:	Medium
726	number-of-atoms		:memo:	Hard
727	minimum-window-subsequence	:lock:	:memo:	Hard
728	self-dividing-numbers		:memo:	Easy
729	my-calendar-i		:memo:	Medium
730	count-different-palindromic-subsequences		:memo:	Hard
731	my-calendar-ii		:memo:	Medium
732	my-calendar-iii		:memo:	Hard
733	flood-fill		:memo:	Easy
734	sentence-similarity	:lock:	:memo:	Easy
735	asteroid-collision		:memo:	Medium
736	parse-lisp-expression		:memo:	Hard
737	sentence-similarity-ii	:lock:	:memo:	Medium
738	monotone-increasing-digits		:memo:	Medium
739	daily-temperatures		:memo:	Medium
740	delete-and-earn		:memo:	Medium
741	cherry-pickup		:memo:	Hard
742	to-lower-case			Easy
743	closest-leaf-in-a-binary-tree	:lock:	:memo:	Medium
744	network-delay-time		:memo:	Medium
745	find-smallest-letter-greater-than-target		:memo:	Easy
746	prefix-and-suffix-search		:memo:	Hard
747	min-cost-climbing-stairs		:memo:	Easy
748	largest-number-at-least-twice-of-others		:memo:	Easy
749	shortest-completing-word		:memo:	Medium
750	contain-virus		:memo:	Hard
751	number-of-corner-rectangles	:lock:	:memo:	Medium
752	ip-to-cidr	:lock:	:memo:	Easy
753	open-the-lock		:memo:	Medium
754	cracking-the-safe		:memo:	Hard
755	reach-a-number		:memo:	Medium
756	pour-water	:lock:	:memo:	Medium
757	pyramid-transition-matrix		:memo:	Medium
758	convert-binary-search-tree-to-sorted-doubly-linked-list	:lock:		Medium
759	set-intersection-size-at-least-two		:memo:	Hard
760	bold-words-in-string	:lock:	:memo:	Easy
761	employee-free-time	:lock:	:memo:	Hard
762	find-anagram-mappings	:lock:	:memo:	Easy
763	special-binary-string		:memo:	Hard
764	n-ary-tree-level-order-traversal			Easy
765	serialize-and-deserialize-n-ary-tree	:lock:		Hard
766	flatten-a-multilevel-doubly-linked-list			Medium
767	prime-number-of-set-bits-in-binary-representation		:memo:	Easy
768	partition-labels		:memo:	Medium
769	largest-plus-sign		:memo:	Medium
770	couples-holding-hands		:memo:	Hard
771	encode-n-ary-tree-to-binary-tree	:lock:		Hard
772	construct-quad-tree			Easy
773	quad-tree-intersection			Easy
774	maximum-depth-of-n-ary-tree			Easy
775	n-ary-tree-preorder-traversal			Easy
776	n-ary-tree-postorder-traversal			Easy
777	toeplitz-matrix		:memo:	Easy
778	reorganize-string		:memo:	Medium
779	max-chunks-to-make-sorted-ii		:memo:	Hard
780	max-chunks-to-make-sorted		:memo:	Medium
781	basic-calculator-iv		:memo:	Hard
782	jewels-and-stones		:memo:	Easy
783	search-in-a-binary-search-tree			Easy
784	insert-into-a-binary-search-tree			Medium
785	basic-calculator-iii	:lock:		Hard
786	search-in-a-sorted-array-of-unknown-size	:lock:		Medium
787	sliding-puzzle		:memo:	Hard
788	minimize-max-distance-to-gas-station	:lock:	:memo:	Hard
789	kth-largest-element-in-a-stream			Easy
790	global-and-local-inversions		:memo:	Medium
791	split-bst	:lock:	:memo:	Medium
792	binary-search			Easy
793	swap-adjacent-in-lr-string		:memo:	Medium
794	swim-in-rising-water		:memo:	Hard
795	k-th-symbol-in-grammar		:memo:	Medium
796	reaching-points		:memo:	Hard
797	rabbits-in-forest		:memo:	Medium
798	transform-to-chessboard		:memo:	Hard
799	minimum-distance-between-bst-nodes		:memo:	Easy
800	letter-case-permutation		:memo:	Easy
801	is-graph-bipartite		:memo:	Medium
802	k-th-smallest-prime-fraction		:memo:	Hard
803	cheapest-flights-within-k-stops		:memo:	Medium
804	rotated-digits		:memo:	Easy
805	escape-the-ghosts		:memo:	Medium
806	domino-and-tromino-tiling		:memo:	Medium
807	custom-sort-string		:memo:	Medium
808	number-of-matching-subsequences		:memo:	Medium
809	preimage-size-of-factorial-zeroes-function		:memo:	Hard
810	valid-tic-tac-toe-state		:memo:	Medium
811	number-of-subarrays-with-bounded-maximum		:memo:	Medium
812	rotate-string		:memo:	Easy
813	all-paths-from-source-to-target		:memo:	Medium
814	smallest-rotation-with-highest-score		:memo:	Hard
815	champagne-tower		:memo:	Medium
816	design-hashset			Easy
817	design-hashmap			Easy
818	similar-rgb-color	:lock:	:memo:	Easy
819	minimum-swaps-to-make-sequences-increasing		:memo:	Medium
820	find-eventual-safe-states		:memo:	Medium
821	bricks-falling-when-hit		:memo:	Hard
822	unique-morse-code-words		:memo:	Easy
823	split-array-with-same-average		:memo:	Hard
824	number-of-lines-to-write-string		:memo:	Easy
825	max-increase-to-keep-city-skyline		:memo:	Medium
826	soup-servings		:memo:	Medium
827	expressive-words		:memo:	Medium
828	chalkboard-xor-game		:memo:	Hard
829	subdomain-visit-count		:memo:	Easy
830	largest-triangle-area		:memo:	Easy
831	largest-sum-of-averages		:memo:	Medium
832	binary-tree-pruning		:memo:	Medium
833	bus-routes		:memo:	Hard
834	ambiguous-coordinates		:memo:	Medium
835	linked-list-components		:memo:	Medium
836	race-car		:memo:	Hard
837	most-common-word		:memo:	Easy
838	design-linked-list			Easy
839	short-encoding-of-words		:memo:	Medium
841	shortest-distance-to-a-character		:memo:	Easy
842	card-flipping-game		:memo:	Medium
843	binary-trees-with-factors		:memo:	Medium
850	insert-into-a-cyclic-sorted-list	:lock:		Medium
851	goat-latin		:memo:	Easy
852	friends-of-appropriate-ages		:memo:	Medium
853	most-profit-assigning-work		:memo:	Medium
854	making-a-large-island		:memo:	Hard
855	unique-letter-string		:memo:	Hard
856	consecutive-numbers-sum		:memo:	Medium
857	positions-of-large-groups		:memo:	Easy
858	masking-personal-information		:memo:	Medium
859	design-circular-deque			Medium
860	design-circular-queue			Medium
861	flipping-an-image		:memo:	Easy
862	find-and-replace-in-string		:memo:	Medium
863	sum-of-distances-in-tree		:memo:	Hard
864	image-overlap		:memo:	Medium
865	robot-room-cleaner	:lock:		Hard
866	rectangle-overlap		:memo:	Easy
867	new-21-game		:memo:	Medium
868	push-dominoes		:memo:	Medium
869	similar-string-groups		:memo:	Hard
870	magic-squares-in-grid		:memo:	Easy
871	keys-and-rooms		:memo:	Medium
872	split-array-into-fibonacci-sequence		:memo:	Medium
873	guess-the-word		:memo:	Hard
874	backspace-string-compare		:memo:	Easy
875	longest-mountain-in-array		:memo:	Medium
876	hand-of-straights		:memo:	Medium
877	shortest-path-visiting-all-nodes		:memo:	Hard
878	shifting-letters		:memo:	Medium
879	maximize-distance-to-closest-person		:memo:	Easy
880	rectangle-area-ii		:memo:	Hard
881	loud-and-rich		:memo:	Medium
882	peak-index-in-a-mountain-array		:memo:	Easy
883	car-fleet		:memo:	Medium
884	k-similar-strings		:memo:	Hard
885	exam-room		:memo:	Medium
886	score-of-parentheses		:memo:	Medium
887	minimum-cost-to-hire-k-workers		:memo:	Hard
888	mirror-reflection		:memo:	Medium
889	buddy-strings		:memo:	Easy
890	lemonade-change		:memo:	Easy
891	score-after-flipping-matrix		:memo:	Medium
892	shortest-subarray-with-sum-at-least-k		:memo:	Hard
893	all-nodes-distance-k-in-binary-tree		:memo:	Medium
894	random-pick-with-blacklist		:memo:	Hard
895	shortest-path-to-get-all-keys		:memo:	Hard
896	smallest-subtree-with-all-the-deepest-nodes		:memo:	Medium
897	prime-palindrome		:memo:	Medium
898	transpose-matrix		:memo:	Easy
899	binary-gap		:memo:	Easy
900	reordered-power-of-2		:memo:	Medium
901	advantage-shuffle		:memo:	Medium
902	minimum-number-of-refueling-stops		:memo:	Hard
903	implement-rand10-using-rand7		:memo:	Medium
904	leaf-similar-trees		:memo:	Easy
905	length-of-longest-fibonacci-subsequence		:memo:	Medium
906	walking-robot-simulation		:memo:	Easy
907	koko-eating-bananas		:memo:	Medium
908	middle-of-the-linked-list		:memo:	Easy
909	stone-game		:memo:	Medium
910	nth-magical-number		:memo:	Hard
911	profitable-schemes		:memo:	Hard
912	random-pick-with-weight		:memo:	Medium
913	random-flip-matrix		:memo:	Medium
914	random-point-in-non-overlapping-rectangles		:memo:	Medium
915	generate-random-point-in-a-circle		:memo:	Medium
916	decoded-string-at-index		:memo:	Medium
917	boats-to-save-people		:memo:	Medium
918	reachable-nodes-in-subdivided-graph		:memo:	Hard
919	projection-area-of-3d-shapes		:memo:	Easy
920	uncommon-words-from-two-sentences		:memo:	Easy
921	spiral-matrix-iii		:memo:	Medium
922	possible-bipartition		:memo:	Medium
923	super-egg-drop		:memo:	Hard
924	fair-candy-swap		:memo:	Easy
925	construct-binary-tree-from-preorder-and-postorder-traversal		:memo:	Medium
926	find-and-replace-pattern		:memo:	Medium
927	sum-of-subsequence-widths		:memo:	Hard
928	surface-area-of-3d-shapes		:memo:	Easy
929	groups-of-special-equivalent-strings		:memo:	Easy
930	all-possible-full-binary-trees		:memo:	Medium
931	maximum-frequency-stack		:memo:	Hard
932	monotonic-array		:memo:	Easy
933	increasing-order-search-tree		:memo:	Easy
934	bitwise-ors-of-subarrays		:memo:	Medium
935	orderly-queue		:memo:	Hard
936	rle-iterator		:memo:	Medium
937	online-stock-span		:memo:	Medium
938	numbers-at-most-n-given-digit-set		:memo:	Hard
939	valid-permutations-for-di-sequence		:memo:	Hard