leetcode solutions using python

This is my leetcode solution folder.

Language: python

Last updated: 2017-06-13

I've solved 547/547 problems (101 problems for a fee).

The source code was fetched using the tool leetcode-spider.

#	Problems	Solutions	Difficulty
001	two-sum	python	Easy
002	add-two-numbers	python	Medium
003	longest-substring-without-repeating-characters	python	Medium
004	median-of-two-sorted-arrays	python	hard
005	longest-palindromic-substring	python	Medium
006	zigzag-conversion	python	Medium
007	reverse-integer	python	Easy
008	string-to-integer-atoi	python	Medium
009	palindrome-number	python	Easy
010	regular-expression-matching	python	hard
011	container-with-most-water	python	Medium
012	integer-to-roman	python	Medium
013	roman-to-integer	python	Easy
014	longest-common-prefix	python	Easy
015	3sum	python	Medium
016	3sum-closest	python	Medium
017	letter-combinations-of-a-phone-number	python	Medium
018	4sum	python	Medium
019	remove-nth-node-from-end-of-list	python	Medium
020	valid-parentheses	python	Easy
021	merge-two-sorted-lists	python	Easy
022	generate-parentheses	python	Medium
023	merge-k-sorted-lists	python	hard
024	swap-nodes-in-pairs	python	Medium
025	reverse-nodes-in-k-group	python	hard
026	remove-duplicates-from-sorted-array	python	Easy
027	remove-element	python	Easy
028	implement-strstr	python	Easy
029	divide-two-integers	python	Medium
030	substring-with-concatenation-of-all-words	python	hard
031	next-permutation	python	Medium
032	longest-valid-parentheses	python	hard
033	search-in-rotated-sorted-array	python	Medium
034	search-for-a-range	python	Medium
035	search-insert-position	python	Easy
036	valid-sudoku	python	Medium
037	sudoku-solver	python	hard
038	count-and-say	python	Easy
039	combination-sum	python	Medium
040	combination-sum-ii	python	Medium
041	first-missing-positive	python	hard
042	trapping-rain-water	python	hard
043	multiply-strings	python	Medium
044	wildcard-matching	python	hard
045	jump-game-ii	python	hard
046	permutations	python	Medium
047	permutations-ii	python	Medium
048	rotate-image	python	Medium
049	anagrams	python	Medium
050	powx-n	python	Medium
051	n-queens	python	hard
052	n-queens-ii	python	hard
053	maximum-subarray	python	Easy
054	spiral-matrix	python	Medium
055	jump-game	python	Medium
056	merge-intervals	python	Medium
057	insert-interval	python	hard
058	length-of-last-word	python	Easy
059	spiral-matrix-ii	python	Medium
060	permutation-sequence	python	Medium
061	rotate-list	python	Medium
062	unique-paths	python	Medium
063	unique-paths-ii	python	Medium
064	minimum-path-sum	python	Medium
065	valid-number	python	hard
066	plus-one	python	Easy
067	add-binary	python	Easy
068	text-justification	python	hard
069	sqrtx	python	Easy
070	climbing-stairs	python	Easy
071	simplify-path	python	Medium
072	edit-distance	python	hard
073	set-matrix-zeroes	python	Medium
074	search-a-2d-matrix	python	Medium
075	sort-colors	python	Medium
076	minimum-window-substring	python	hard
077	combinations	python	Medium
078	subsets	python	Medium
079	word-search	python	Medium
080	remove-duplicates-from-sorted-array-ii	python	Medium
081	search-in-rotated-sorted-array-ii	python	Medium
082	remove-duplicates-from-sorted-list-ii	python	Medium
083	remove-duplicates-from-sorted-list	python	Easy
084	largest-rectangle-in-histogram	python	hard
085	maximal-rectangle	python	hard
086	partition-list	python	Medium
087	scramble-string	python	hard
088	merge-sorted-array	python	Easy
089	gray-code	python	Medium
090	subsets-ii	python	Medium
091	decode-ways	python	Medium
092	reverse-linked-list-ii	python	Medium
093	restore-ip-addresses	python	Medium
094	binary-tree-inorder-traversal	python	Medium
095	unique-binary-search-trees-ii	python	Medium
096	unique-binary-search-trees	python	Medium
097	interleaving-string	python	hard
098	validate-binary-search-tree	python	Medium
099	recover-binary-search-tree	python	hard
100	same-tree	python	Easy
101	symmetric-tree	python	Easy
102	binary-tree-level-order-traversal	python	Medium
103	binary-tree-zigzag-level-order-traversal	python	Medium
104	maximum-depth-of-binary-tree	python	Easy
105	construct-binary-tree-from-preorder-and-inorder-traversal	python	Medium
106	construct-binary-tree-from-inorder-and-postorder-traversal	python	Medium
107	binary-tree-level-order-traversal-ii	python	Easy
108	convert-sorted-array-to-binary-search-tree	python	Easy
109	convert-sorted-list-to-binary-search-tree	python	Medium
110	balanced-binary-tree	python	Easy
111	minimum-depth-of-binary-tree	python	Easy
112	path-sum	python	Easy
113	path-sum-ii	python	Medium
114	flatten-binary-tree-to-linked-list	python	Medium
115	distinct-subsequences	python	hard
116	populating-next-right-pointers-in-each-node	python	Medium
117	populating-next-right-pointers-in-each-node-ii	python	Medium
118	pascals-triangle	python	Easy
119	pascals-triangle-ii	python	Easy
120	triangle	python	Medium
121	best-time-to-buy-and-sell-stock	python	Easy
122	best-time-to-buy-and-sell-stock-ii	python	Easy
123	best-time-to-buy-and-sell-stock-iii	python	hard
124	binary-tree-maximum-path-sum	python	hard
125	valid-palindrome	python	Easy
126	word-ladder-ii	python	hard
127	word-ladder	python	Medium
128	longest-consecutive-sequence	python	hard
129	sum-root-to-leaf-numbers	python	Medium
130	surrounded-regions	python	Medium
131	palindrome-partitioning	python	Medium
132	palindrome-partitioning-ii	python	hard
133	clone-graph	python	Medium
134	gas-station	python	Medium
135	candy	python	hard
136	single-number	python	Easy
137	single-number-ii	python	Medium
138	copy-list-with-random-pointer	python	Medium
139	word-break	python	Medium
140	word-break-ii	python	hard
141	linked-list-cycle	python	Easy
142	linked-list-cycle-ii	python	Medium
143	reorder-list	python	Medium
144	binary-tree-preorder-traversal	python	Medium
145	binary-tree-postorder-traversal	python	hard
146	lru-cache	python	hard
147	insertion-sort-list	python	Medium
148	sort-list	python	Medium
149	max-points-on-a-line	python	hard
150	evaluate-reverse-polish-notation	python	Medium
151	reverse-words-in-a-string	python	Medium
152	maximum-product-subarray	python	Medium
153	find-minimum-in-rotated-sorted-array	python	Medium
154	find-minimum-in-rotated-sorted-array-ii	python	hard
155	min-stack	python	Easy
156	binary-tree-upside-down	python	Medium
157	read-n-characters-given-read4	python	Easy
158	read-n-characters-given-read4-ii-call-multiple-times	python	hard
159	longest-substring-with-at-most-two-distinct-characters	python	hard
160	intersection-of-two-linked-lists	python	Easy
161	one-edit-distance	python	Medium
162	find-peak-element	python	Medium
163	missing-ranges	python	Medium
164	maximum-gap	python	hard
165	compare-version-numbers	python	Medium
166	fraction-to-recurring-decimal	python	Medium
167	two-sum-ii-input-array-is-sorted	python	Easy
168	excel-sheet-column-title	python	Easy
169	majority-element	python	Easy
170	two-sum-iii-data-structure-design	python	Easy
171	excel-sheet-column-number	python	Easy
172	factorial-trailing-zeroes	python	Easy
173	binary-search-tree-iterator	python	Medium
174	dungeon-game	python	hard
179	largest-number	python	Medium
186	reverse-words-in-a-string-ii	python	Medium
187	repeated-dna-sequences	python	Medium
188	best-time-to-buy-and-sell-stock-iv	python	hard
189	rotate-array	python	Easy
190	reverse-bits	python	Easy
191	number-of-1-bits	python	Easy
198	house-robber	python	Easy
199	binary-tree-right-side-view	python	Medium
200	number-of-islands	python	Medium
201	bitwise-and-of-numbers-range	python	Medium
202	happy-number	python	Easy
203	remove-linked-list-elements	python	Easy
204	count-primes	python	Easy
205	isomorphic-strings	python	Easy
206	reverse-linked-list	python	Easy
207	course-schedule	python	Medium
208	implement-trie-prefix-tree	python	Medium
209	minimum-size-subarray-sum	python	Medium
210	course-schedule-ii	python	Medium
211	add-and-search-word-data-structure-design	python	Medium
212	word-search-ii	python	hard
213	house-robber-ii	python	Medium
214	shortest-palindrome	python	hard
215	kth-largest-element-in-an-array	python	Medium
216	combination-sum-iii	python	Medium
217	contains-duplicate	python	Easy
218	the-skyline-problem	python	hard
219	contains-duplicate-ii	python	Easy
220	contains-duplicate-iii	python	Medium
221	maximal-square	python	Medium
222	count-complete-tree-nodes	python	Medium
223	rectangle-area	python	Medium
224	basic-calculator	python	hard
225	implement-stack-using-queues	python	Easy
226	invert-binary-tree	python	Easy
227	basic-calculator-ii	python	Medium
228	summary-ranges	python	Medium
229	majority-element-ii	python	Medium
230	kth-smallest-element-in-a-bst	python	Medium
231	power-of-two	python	Easy
232	implement-queue-using-stacks	python	Easy
233	number-of-digit-one	python	hard
234	palindrome-linked-list	python	Easy
235	lowest-common-ancestor-of-a-binary-search-tree	python	Easy
236	lowest-common-ancestor-of-a-binary-tree	python	Medium
237	delete-node-in-a-linked-list	python	Easy
238	product-of-array-except-self	python	Medium
239	sliding-window-maximum	python	hard
240	search-a-2d-matrix-ii	python	Medium
241	different-ways-to-add-parentheses	python	Medium
242	valid-anagram	python	Easy
243	shortest-word-distance	python	Easy
244	shortest-word-distance-ii	python	Medium
245	shortest-word-distance-iii	python	Medium
246	strobogrammatic-number	python	Easy
247	strobogrammatic-number-ii	python	Medium
248	strobogrammatic-number-iii	python	hard
249	group-shifted-strings	python	Medium
250	count-univalue-subtrees	python	Medium
251	flatten-2d-vector	python	Medium
252	meeting-rooms	python	Easy
253	meeting-rooms-ii	python	Medium
254	factor-combinations	python	Medium
255	verify-preorder-sequence-in-binary-search-tree	python	Medium
256	paint-house	python	Easy
257	binary-tree-paths	python	Easy
258	add-digits	python	Easy
259	3sum-smaller	python	Medium
260	single-number-iii	python	Medium
261	graph-valid-tree	python	Medium
263	ugly-number	python	Easy
264	ugly-number-ii	python	Medium
265	paint-house-ii	python	hard
266	palindrome-permutation	python	Easy
267	palindrome-permutation-ii	python	Medium
268	missing-number	python	Easy
269	alien-dictionary	python	hard
270	closest-binary-search-tree-value	python	Easy
271	encode-and-decode-strings	python	Medium
272	closest-binary-search-tree-value-ii	python	hard
273	integer-to-english-words	python	hard
274	h-index	python	Medium
275	h-index-ii	python	Medium
276	paint-fence	python	Easy
277	find-the-celebrity	python	Medium
278	first-bad-version	python	Easy
279	perfect-squares	python	Medium
280	wiggle-sort	python	Medium
281	zigzag-iterator	python	Medium
282	expression-add-operators	python	hard
283	move-zeroes	python	Easy
284	peeking-iterator	python	Medium
285	inorder-successor-in-bst	python	Medium
286	walls-and-gates	python	Medium
287	find-the-duplicate-number	python	Medium
288	unique-word-abbreviation	python	Medium
289	game-of-life	python	Medium
290	word-pattern	python	Easy
291	word-pattern-ii	python	hard
292	nim-game	python	Easy
293	flip-game	python	Easy
294	flip-game-ii	python	Medium
295	find-median-from-data-stream	python	hard
296	best-meeting-point	python	hard
297	serialize-and-deserialize-binary-tree	python	hard
298	binary-tree-longest-consecutive-sequence	python	Medium
299	bulls-and-cows	python	Medium
300	longest-increasing-subsequence	python	Medium
301	remove-invalid-parentheses	python	hard
302	smallest-rectangle-enclosing-black-pixels	python	hard
303	range-sum-query-immutable	python	Easy
304	range-sum-query-2d-immutable	python	Medium
305	number-of-islands-ii	python	hard
306	additive-number	python	Medium
307	range-sum-query-mutable	python	Medium
308	range-sum-query-2d-mutable	python	hard
309	best-time-to-buy-and-sell-stock-with-cooldown	python	Medium
310	minimum-height-trees	python	Medium
311	sparse-matrix-multiplication	python	Medium
312	burst-balloons	python	hard
313	super-ugly-number	python	Medium
314	binary-tree-vertical-order-traversal	python	Medium
315	count-of-smaller-numbers-after-self	python	hard
316	remove-duplicate-letters	python	hard
317	shortest-distance-from-all-buildings	python	hard
318	maximum-product-of-word-lengths	python	Medium
319	bulb-switcher	python	Medium
320	generalized-abbreviation	python	Medium
321	create-maximum-number	python	hard
322	coin-change	python	Medium
323	number-of-connected-components-in-an-undirected-graph	python	Medium
324	wiggle-sort-ii	python	Medium
325	maximum-size-subarray-sum-equals-k	python	Medium
326	power-of-three	python	Easy
327	count-of-range-sum	python	hard
328	odd-even-linked-list	python	Medium
329	longest-increasing-path-in-a-matrix	python	hard
330	patching-array	python	hard
331	verify-preorder-serialization-of-a-binary-tree	python	Medium
332	reconstruct-itinerary	python	Medium
333	largest-bst-subtree	python	Medium
334	increasing-triplet-subsequence	python	Medium
335	self-crossing	python	hard
336	palindrome-pairs	python	hard
337	house-robber-iii	python	Medium
338	counting-bits	python	Medium
339	nested-list-weight-sum	python	Easy
340	longest-substring-with-at-most-k-distinct-characters	python	hard
341	flatten-nested-list-iterator	python	Medium
342	power-of-four	python	Easy
343	integer-break	python	Medium
344	reverse-string	python	Easy
345	reverse-vowels-of-a-string	python	Easy
346	moving-average-from-data-stream	python	Easy
347	top-k-frequent-elements	python	Medium
348	design-tic-tac-toe	python	Medium
349	intersection-of-two-arrays	python	Easy
350	intersection-of-two-arrays-ii	python	Easy
351	android-unlock-patterns	python	Medium
352	data-stream-as-disjoint-intervals	python	hard
353	design-snake-game	python	Medium
354	russian-doll-envelopes	python	hard
355	design-twitter	python	Medium
356	line-reflection	python	Medium
357	count-numbers-with-unique-digits	python	Medium
358	rearrange-string-k-distance-apart	python	hard
359	logger-rate-limiter	python	Easy
360	sort-transformed-array	python	Medium
361	bomb-enemy	python	Medium
362	design-hit-counter	python	Medium
363	max-sum-of-sub-matrix-no-larger-than-k	python	hard
364	nested-list-weight-sum-ii	python	Medium
365	water-and-jug-problem	python	Medium
366	find-leaves-of-binary-tree	python	Medium
367	valid-perfect-square	python	Easy
368	largest-divisible-subset	python	Medium
369	plus-one-linked-list	python	Medium
370	range-addition	python	Medium
371	sum-of-two-integers	python	Easy
372	super-pow	python	Medium
373	find-k-pairs-with-smallest-sums	python	Medium
374	guess-number-higher-or-lower	python	Easy
375	guess-number-higher-or-lower-ii	python	Medium
376	wiggle-subsequence	python	Medium
377	combination-sum-iv	python	Medium
378	kth-smallest-element-in-a-sorted-matrix	python	Medium
379	design-phone-directory	python	Medium
380	insert-delete-getrandom-o1	python	Medium
381	insert-delete-getrandom-o1-duplicates-allowed	python	hard
382	linked-list-random-node	python	Medium
383	ransom-note	python	Easy
384	shuffle-an-array	python	Medium
385	mini-parser	python	Medium
386	lexicographical-numbers	python	Medium
387	first-unique-character-in-a-string	python	Easy
388	longest-absolute-file-path	python	Medium
389	find-the-difference	python	Easy
390	elimination-game	python	Medium
391	perfect-rectangle	python	hard
392	is-subsequence	python	Medium
393	utf-8-validation	python	Medium
394	decode-string	python	Medium
395	longest-substring-with-at-least-k-repeating-characters	python	Medium
396	rotate-function	python	Medium
397	integer-replacement	python	Medium
398	random-pick-index	python	Medium
399	evaluate-division	python	Medium
400	nth-digit	python	Easy
401	binary-watch	python	Easy
402	remove-k-digits	python	Medium
403	frog-jump	python	hard
404	sum-of-left-leaves	python	Easy
405	convert-a-number-to-hexadecimal	python	Easy
406	queue-reconstruction-by-height	python	Medium
407	trapping-rain-water-ii	python	hard
408	valid-word-abbreviation	python	Easy
409	longest-palindrome	python	Easy
410	split-array-largest-sum	python	hard
411	minimum-unique-word-abbreviation	python	hard
412	fizz-buzz	python	Easy
413	arithmetic-slices	python	Medium
414	third-maximum-number	python	Easy
415	add-strings	python	Easy
416	partition-equal-subset-sum	python	Medium
417	pacific-atlantic-water-flow	python	Medium
418	sentence-screen-fitting	python	Medium
419	battleships-in-a-board	python	Medium
420	strong-password-checker	python	hard
421	maximum-xor-of-two-numbers-in-an-array	python	Medium
422	valid-word-square	python	Easy
423	reconstruct-original-digits-from-english	python	Medium
424	longest-repeating-character-replacement	python	Medium
425	word-squares	python	hard
432	all-oone-data-structure	python	hard
434	number-of-segments-in-a-string	python	Easy
435	non-overlapping-intervals	python	Medium
436	find-right-interval	python	Medium
437	path-sum-iii	python	Easy
438	find-all-anagrams-in-a-string	python	Easy
439	ternary-expression-parser	python	Medium
440	k-th-smallest-in-lexicographical-order	python	hard
441	arranging-coins	python	Easy
442	find-all-duplicates-in-an-array	python	Medium
444	sequence-reconstruction	python	Medium
445	add-two-numbers-ii	python	Medium
446	arithmetic-slices-ii-subsequence	python	hard
447	number-of-boomerangs	python	Easy
448	find-all-numbers-disappeared-in-an-array	python	Easy
449	serialize-and-deserialize-bst	python	Medium
450	delete-node-in-a-bst	python	Medium
451	sort-characters-by-frequency	python	Medium
452	minimum-number-of-arrows-to-burst-balloons	python	Medium
453	minimum-moves-to-equal-array-elements	python	Easy
454	4sum-ii	python	Medium
455	assign-cookies	python	Easy
456	132-pattern	python	Medium
459	repeated-substring-pattern	python	Easy
460	lfu-cache	python	hard
461	hamming-distance	python	Easy
462	minimum-moves-to-equal-array-elements-ii	python	Medium
463	island-perimeter	python	Easy
464	can-i-win	python	Medium
465	optimal-account-balancing	python	hard
466	count-the-repetitions	python	hard
467	unique-substrings-in-wraparound-string	python	Medium
468	validate-ip-address	python	Medium
469	convex-polygon	python	Medium
471	encode-string-with-shortest-length	python	hard
472	concatenated-words	python	hard
473	matchsticks-to-square	python	Medium
474	ones-and-zeroes	python	Medium
475	heaters	python	Easy
476	number-complement	python	Easy
477	total-hamming-distance	python	Medium
480	sliding-window-median	python	hard
481	magical-string	python	Medium
482	license-key-formatting	python	Medium
483	smallest-good-base	python	hard
484	find-permutation	python	Medium
485	max-consecutive-ones	python	Easy
486	predict-the-winner	python	Medium
487	max-consecutive-ones-ii	python	Medium
488	zuma-game	python	hard
490	the-maze	python	Medium
491	increasing-subsequences	python	Medium
492	construct-the-rectangle	python	Easy
493	reverse-pairs	python	hard
494	target-sum	python	Medium
495	teemo-attacking	python	Medium
496	next-greater-element-i	python	Easy
498	diagonal-traverse	python	Medium
499	the-maze-iii	python	hard
500	keyboard-row	python	Easy
501	find-mode-in-binary-search-tree	python	Easy
502	ipo	python	hard
503	next-greater-element-ii	python	Medium
504	base-7	python	Easy
505	the-maze-ii	python	Medium
506	relative-ranks	python	Easy
507	perfect-number	python	Easy
508	most-frequent-subtree-sum	python	Medium
513	find-bottom-left-tree-value	python	Medium
514	freedom-trail	python	hard
515	find-largest-value-in-each-tree-row	python	Medium
516	longest-palindromic-subsequence	python	Medium
517	super-washing-machines	python	hard
520	detect-capital	python	Easy
521	longest-uncommon-subsequence-i	python	Easy
522	longest-uncommon-subsequence-ii	python	Medium
523	continuous-subarray-sum	python	Medium
524	longest-word-in-dictionary-through-deleting	python	Medium
525	contiguous-array	python	Medium
526	beautiful-arrangement	python	Medium
527	word-abbreviation	python	hard
529	minesweeper	python	Medium
530	minimum-absolute-difference-in-bst	python	Easy
531	lonely-pixel-i	python	Medium
532	k-diff-pairs-in-an-array	python	Easy
533	lonely-pixel-ii	python	Medium
535	encode-and-decode-tinyurl	python	Medium
536	construct-binary-tree-from-string	python	Medium
537	complex-number-multiplication	python	Medium
538	convert-bst-to-greater-tree	python	Medium
539	minimum-time-difference	python	Medium
541	reverse-string-ii	python	Easy
542	01-matrix	python	Medium
543	diameter-of-binary-tree	python	Easy
544	output-contest-matches	python	Medium
545	boundary-of-binary-tree	python	Medium
546	remove-boxes	python	hard
547	friend-circles	python	Medium
548	split-array-with-equal-sum	python	Medium
549	binary-tree-longest-consecutive-sequence-ii	python	Medium
551	student-attendance-record-i	python	Easy
552	student-attendance-record-ii	python	hard
553	optimal-division	python	Medium
554	brick-wall	python	Medium
555	split-concatenated-strings	python	Medium
556	next-greater-element-iii	python	Medium
557	reverse-words-in-a-string-iii	python	Easy
560	subarray-sum-equals-k	python	Medium
561	array-partition-i	python	Easy
562	longest-line-of-consecutive-one-in-matrix	python	Medium
563	binary-tree-tilt	python	Easy
564	find-the-closest-palindrome	python	hard
565	array-nesting	python	Medium
566	reshape-the-matrix	python	Easy
567	permutation-in-string	python	Medium
568	maximum-vacation-days	python	hard
572	subtree-of-another-tree	python	Easy
573	squirrel-simulation	python	Medium
575	distribute-candies	python	Easy
576	out-of-boundary-paths	python	hard
581	shortest-unsorted-continuous-subarray	python	Easy
582	kill-process	python	Medium
583	delete-operation-for-two-strings	python	Medium
587	erect-the-fence	python	hard
588	design-in-memory-file-system	python	hard
591	tag-validator	python	hard
592	fraction-addition-and-subtraction	python	Medium
593	valid-square	python	Medium
594	longest-harmonious-subsequence	python	Easy
598	range-addition-ii	python	Easy
599	minimum-index-sum-of-two-lists	python	Easy
600	non-negative-integers-without-consecutive-ones	python	hard
604	design-compressed-string-iterator	python	Easy
605	can-place-flowers	python	Easy
606	construct-string-from-binary-tree	python	Easy
609	find-duplicate-file-in-system	python	Medium
611	valid-triangle-number	python	Medium
616	add-bold-tag-in-string	python	Medium
617	merge-two-binary-trees	python	Easy