✏️ Leetcode Solutions with python

Update time: 2016-11-14 19:39:08

I have solved 32 / 421 problems while there are 77 problems still locked.

If you have any question, please give me an issue.

If you are loving solving problems in leetcode, please contact me to enjoy it together!

(Notes: 🔒 means you need to buy a book from Leetcode to unlock the problem)

#	Title	Source Code	Article	Difficulty
1	two-sum	python	📝	Easy
2	add-two-numbers	python	📝	Medium
3	longest-substring-without-repeating-characters	python	📝	Medium
4	median-of-two-sorted-arrays	python		Hard
5	longest-palindromic-substring	python	📝	Medium
6	zigzag-conversion	python		Easy
7	reverse-integer	python		Easy
8	string-to-integer-atoi	python		Easy
9	palindrome-number	python		Easy
10	regular-expression-matching	python		Hard
11	container-with-most-water	python	📝	Medium
12	integer-to-roman	python		Medium
13	roman-to-integer	python		Easy
14	longest-common-prefix	python	📝	Easy
15	3sum	python		Medium
16	3sum-closest	python		Medium
17	letter-combinations-of-a-phone-number	python		Medium
18	4sum			Medium
19	remove-nth-node-from-end-of-list	python	📝	Easy
20	valid-parentheses	python		Easy
21	merge-two-sorted-lists	python		Easy
22	generate-parentheses			Medium
23	merge-k-sorted-lists	python		Hard
24	swap-nodes-in-pairs	python		Easy
25	reverse-nodes-in-k-group			Hard
26	remove-duplicates-from-sorted-array	python	📝	Easy
27	remove-element	python	📝	Easy
28	implement-strstr	python		Easy
29	divide-two-integers			Medium
30	substring-with-concatenation-of-all-words			Hard
31	next-permutation		📝	Medium
32	longest-valid-parentheses			Hard
33	search-in-rotated-sorted-array			Hard
34	search-for-a-range	python		Medium
35	search-insert-position			Medium
36	valid-sudoku			Easy
37	sudoku-solver			Hard
38	count-and-say	python		Easy
39	combination-sum	python		Medium
40	combination-sum-ii			Medium
41	first-missing-positive			Hard
42	trapping-rain-water			Hard
43	multiply-strings			Medium
44	wildcard-matching			Hard
45	jump-game-ii			Hard
46	permutations			Medium
47	permutations-ii			Medium
48	rotate-image			Medium
49	anagrams			Medium
50	powx-n			Medium
51	n-queens			Hard
52	n-queens-ii			Hard
53	maximum-subarray			Medium
54	spiral-matrix			Medium
55	jump-game		📝	Medium
56	merge-intervals			Hard
57	insert-interval			Hard
58	length-of-last-word			Easy
59	spiral-matrix-ii			Medium
60	permutation-sequence			Medium
61	rotate-list			Medium
62	unique-paths			Medium
63	unique-paths-ii			Medium
64	minimum-path-sum			Medium
65	valid-number			Hard
66	plus-one			Easy
67	add-binary			Easy
68	text-justification			Hard
69	sqrtx			Medium
70	climbing-stairs			Easy
71	simplify-path			Medium
72	edit-distance			Hard
73	set-matrix-zeroes			Medium
74	search-a-2d-matrix			Medium
75	sort-colors			Medium
76	minimum-window-substring			Hard
77	combinations			Medium
78	subsets			Medium
79	word-search			Medium
80	remove-duplicates-from-sorted-array-ii			Medium
81	search-in-rotated-sorted-array-ii			Medium
82	remove-duplicates-from-sorted-list-ii			Medium
83	remove-duplicates-from-sorted-list		📝	Easy
84	largest-rectangle-in-histogram			Hard
85	maximal-rectangle			Hard
86	partition-list			Medium
87	scramble-string			Hard
88	merge-sorted-array			Easy
89	gray-code			Medium
90	subsets-ii			Medium
91	decode-ways			Medium
92	reverse-linked-list-ii			Medium
93	restore-ip-addresses			Medium
94	binary-tree-inorder-traversal			Medium
95	unique-binary-search-trees-ii			Medium
96	unique-binary-search-trees			Medium
97	interleaving-string			Hard
98	validate-binary-search-tree			Medium
99	recover-binary-search-tree			Hard
100	same-tree			Easy
101	symmetric-tree		📝	Easy
102	binary-tree-level-order-traversal			Easy
103	binary-tree-zigzag-level-order-traversal			Medium
104	maximum-depth-of-binary-tree			Easy
105	construct-binary-tree-from-preorder-and-inorder-traversal			Medium
106	construct-binary-tree-from-inorder-and-postorder-traversal			Medium
107	binary-tree-level-order-traversal-ii	python		Easy
108	convert-sorted-array-to-binary-search-tree			Medium
109	convert-sorted-list-to-binary-search-tree			Medium
110	balanced-binary-tree			Easy
111	minimum-depth-of-binary-tree	python		Easy
112	path-sum			Easy
113	path-sum-ii			Medium
114	flatten-binary-tree-to-linked-list			Medium
115	distinct-subsequences			Hard
116	populating-next-right-pointers-in-each-node			Medium
117	populating-next-right-pointers-in-each-node-ii			Hard
118	pascals-triangle			Easy
119	pascals-triangle-ii			Easy
120	triangle			Medium
121	best-time-to-buy-and-sell-stock		📝	Easy
122	best-time-to-buy-and-sell-stock-ii		📝	Medium
123	best-time-to-buy-and-sell-stock-iii			Hard
124	binary-tree-maximum-path-sum			Hard
125	valid-palindrome	python		Easy
126	word-ladder-ii			Hard
127	word-ladder			Medium
128	longest-consecutive-sequence			Hard
129	sum-root-to-leaf-numbers			Medium
130	surrounded-regions			Medium
131	palindrome-partitioning			Medium
132	palindrome-partitioning-ii			Hard
133	clone-graph			Medium
134	gas-station			Medium
135	candy			Hard
136	single-number			Easy
137	single-number-ii			Medium
138	copy-list-with-random-pointer			Hard
139	word-break			Medium
140	word-break-ii			Hard
141	linked-list-cycle		📝	Easy
142	linked-list-cycle-ii			Medium
143	reorder-list			Medium
144	binary-tree-preorder-traversal			Medium
145	binary-tree-postorder-traversal			Hard
146	lru-cache			Hard
147	insertion-sort-list			Medium
148	sort-list			Medium
149	max-points-on-a-line			Hard
150	evaluate-reverse-polish-notation			Medium
151	reverse-words-in-a-string			Medium
152	maximum-product-subarray			Medium
153	find-minimum-in-rotated-sorted-array			Medium
154	find-minimum-in-rotated-sorted-array-ii			Hard
155	min-stack			Easy
156	binary-tree-upside-down	🔒		Medium
157	read-n-characters-given-read4	🔒		Easy
158	read-n-characters-given-read4-ii-call-multiple-times	🔒		Hard
159	longest-substring-with-at-most-two-distinct-characters	🔒		Hard
160	intersection-of-two-linked-lists		📝	Easy
161	one-edit-distance	🔒		Medium
162	find-peak-element			Medium
163	missing-ranges	🔒		Medium
164	maximum-gap			Hard
165	compare-version-numbers			Easy
166	fraction-to-recurring-decimal		📝	Medium
167	two-sum-ii-input-array-is-sorted		📝	Medium
168	excel-sheet-column-title			Easy
169	majority-element			Easy
170	two-sum-iii-data-structure-design	🔒		Easy
171	excel-sheet-column-number			Easy
172	factorial-trailing-zeroes			Easy
173	binary-search-tree-iterator			Medium
174	dungeon-game			Hard
179	largest-number			Medium
186	reverse-words-in-a-string-ii	🔒		Medium
187	repeated-dna-sequences			Medium
188	best-time-to-buy-and-sell-stock-iv			Hard
189	rotate-array		📝	Easy
190	reverse-bits			Easy
191	number-of-1-bits		📝	Easy
198	house-robber		📝	Easy
199	binary-tree-right-side-view			Medium
200	number-of-islands			Medium
201	bitwise-and-of-numbers-range			Medium
202	happy-number			Easy
203	remove-linked-list-elements			Easy
204	count-primes			Easy
205	isomorphic-strings			Easy
206	reverse-linked-list		📝	Easy
207	course-schedule			Medium
208	implement-trie-prefix-tree		📝	Medium
209	minimum-size-subarray-sum			Medium
210	course-schedule-ii			Medium
211	add-and-search-word-data-structure-design			Medium
212	word-search-ii			Hard
213	house-robber-ii			Medium
214	shortest-palindrome			Hard
215	kth-largest-element-in-an-array			Medium
216	combination-sum-iii			Medium
217	contains-duplicate		📝	Easy
218	the-skyline-problem			Hard
219	contains-duplicate-ii		📝	Easy
220	contains-duplicate-iii		📝	Medium
221	maximal-square		📝	Medium
222	count-complete-tree-nodes			Medium
223	rectangle-area			Easy
224	basic-calculator			Hard
225	implement-stack-using-queues		📝	Easy
226	invert-binary-tree		📝	Easy
227	basic-calculator-ii			Medium
228	summary-ranges		📝	Medium
229	majority-element-ii			Medium
230	kth-smallest-element-in-a-bst			Medium
231	power-of-two			Easy
232	implement-queue-using-stacks		📝	Easy
233	number-of-digit-one			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		📝	Easy
238	product-of-array-except-self			Medium
239	sliding-window-maximum			Hard
240	search-a-2d-matrix-ii			Medium
241	different-ways-to-add-parentheses			Medium
242	valid-anagram		📝	Easy
243	shortest-word-distance	🔒	📝	Easy
244	shortest-word-distance-ii	🔒		Medium
245	shortest-word-distance-iii	🔒		Medium
246	strobogrammatic-number	🔒		Easy
247	strobogrammatic-number-ii	🔒		Medium
248	strobogrammatic-number-iii	🔒		Hard
249	group-shifted-strings	🔒		Easy
250	count-univalue-subtrees	🔒		Medium
251	flatten-2d-vector	🔒		Medium
252	meeting-rooms	🔒	📝	Easy
253	meeting-rooms-ii	🔒		Medium
254	factor-combinations	🔒		Medium
255	verify-preorder-sequence-in-binary-search-tree	🔒		Medium
256	paint-house	🔒		Medium
257	binary-tree-paths			Easy
258	add-digits			Easy
259	3sum-smaller	🔒	📝	Medium
260	single-number-iii			Medium
261	graph-valid-tree	🔒		Medium
263	ugly-number			Easy
264	ugly-number-ii			Medium
265	paint-house-ii	🔒		Hard
266	palindrome-permutation	🔒		Easy
267	palindrome-permutation-ii	🔒		Medium
268	missing-number			Medium
269	alien-dictionary	🔒		Hard
270	closest-binary-search-tree-value	🔒		Easy
271	encode-and-decode-strings	🔒		Medium
272	closest-binary-search-tree-value-ii	🔒		Hard
273	integer-to-english-words			Hard
274	h-index		📝	Medium
275	h-index-ii			Medium
276	paint-fence	🔒		Easy
277	find-the-celebrity	🔒		Medium
278	first-bad-version		📝	Easy
279	perfect-squares			Medium
280	wiggle-sort	🔒	📝	Medium
281	zigzag-iterator	🔒		Medium
282	expression-add-operators			Hard
283	move-zeroes		📝	Easy
284	peeking-iterator			Medium
285	inorder-successor-in-bst	🔒		Medium
286	walls-and-gates	🔒	📝	Medium
287	find-the-duplicate-number			Hard
288	unique-word-abbreviation	🔒	📝	Easy
289	game-of-life			Medium
290	word-pattern			Easy
291	word-pattern-ii	🔒		Hard
292	nim-game		📝	Easy
293	flip-game	🔒		Easy
294	flip-game-ii	🔒		Medium
295	find-median-from-data-stream			Hard
296	best-meeting-point	🔒	📝	Hard
297	serialize-and-deserialize-binary-tree			Hard
298	binary-tree-longest-consecutive-sequence	🔒	📝	Medium
299	bulls-and-cows			Easy
300	longest-increasing-subsequence			Medium
301	remove-invalid-parentheses			Hard
302	smallest-rectangle-enclosing-black-pixels	🔒		Hard
303	range-sum-query-immutable		📝	Easy
304	range-sum-query-2d-immutable		📝	Medium
305	number-of-islands-ii	🔒		Hard
306	additive-number			Medium
307	range-sum-query-mutable		📝	Medium
308	range-sum-query-2d-mutable	🔒		Hard
309	best-time-to-buy-and-sell-stock-with-cooldown			Medium
310	minimum-height-trees			Medium
311	sparse-matrix-multiplication	🔒		Medium
312	burst-balloons			Hard
313	super-ugly-number			Medium
314	binary-tree-vertical-order-traversal	🔒		Medium
315	count-of-smaller-numbers-after-self			Hard
316	remove-duplicate-letters			Hard
317	shortest-distance-from-all-buildings	🔒		Hard
318	maximum-product-of-word-lengths			Medium
319	bulb-switcher			Medium
320	generalized-abbreviation	🔒		Medium
321	create-maximum-number			Hard
322	coin-change		📝	Medium
323	number-of-connected-components-in-an-undirected-graph	🔒		Medium
324	wiggle-sort-ii			Medium
325	maximum-size-subarray-sum-equals-k	🔒		Medium
326	power-of-three		📝	Easy
327	count-of-range-sum			Hard
328	odd-even-linked-list		📝	Medium
329	longest-increasing-path-in-a-matrix			Hard
330	patching-array			Hard
331	verify-preorder-serialization-of-a-binary-tree			Medium
332	reconstruct-itinerary			Medium
333	largest-bst-subtree	🔒		Medium
334	increasing-triplet-subsequence			Medium
335	self-crossing			Hard
336	palindrome-pairs			Hard
337	house-robber-iii			Medium
338	counting-bits			Medium
339	nested-list-weigh AED7 t-sum	🔒	📝	Easy
340	longest-substring-with-at-most-k-distinct-characters	🔒		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	🔒		Easy
347	top-k-frequent-elements			Medium
348	design-tic-tac-toe	🔒		Medium
349	intersection-of-two-arrays			Easy
350	intersection-of-two-arrays-ii			Easy
351	android-unlock-patterns	🔒	📝	Medium
352	data-stream-as-disjoint-intervals			Hard
353	design-snake-game	🔒		Medium
354	russian-doll-envelopes			Hard
355	design-twitter			Medium
356	line-reflection	🔒		Medium
357	count-numbers-with-unique-digits			Medium
358	rearrange-string-k-distance-apart	🔒		Hard
359	logger-rate-limiter	🔒		Easy
360	sort-transformed-array	🔒		Medium
361	bomb-enemy	🔒		Medium
362	design-hit-counter	🔒		Medium
363	max-sum-of-sub-matrix-no-larger-than-k			Hard
364	nested-list-weight-sum-ii	🔒		Medium
365	water-and-jug-problem			Medium
366	find-leaves-of-binary-tree	🔒		Medium
367	valid-perfect-square			Medium
368	largest-divisible-subset			Medium
369	plus-one-linked-list	🔒		Medium
370	range-addition	🔒	📝	Medium
371	sum-of-two-integers			Easy
372	super-pow			Medium
373	find-k-pairs-with-smallest-sums			Medium
374	guess-number-higher-or-lower		📝	Easy
375	guess-number-higher-or-lower-ii			Medium
376	wiggle-subsequence		📝	Medium
377	combination-sum-iv			Medium
378	kth-smallest-element-in-a-sorted-matrix			Medium
379	design-phone-directory	🔒		Medium
380	insert-delete-getrandom-o1			Hard
381	insert-delete-getrandom-o1-duplicates-allowed			Hard
382	linked-list-random-node			Medium
383	ransom-note			Easy
384	shuffle-an-array			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			Easy
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			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	🔒		Easy
409	longest-palindrome			Easy
410	split-array-largest-sum			Hard
411	minimum-unique-word-abbreviation	🔒		Hard
412	fizz-buzz			Easy
413	arithmetic-slices			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	🔒		Medium
419	battleships-in-a-board			Medium
420	strong-password-checker	python		Hard
421	maximum-xor-of-two-numbers-in-an-array			Medium
422	valid-word-square	🔒		Easy
423	reconstruct-original-digits-from-english			Medium
424	longest-repeating-character-replacement			Medium
425	word-squares	🔒		Hard
432	all-oone-data-structure			Hard
435	non-overlapping-intervals			Medium
436	find-right-interval			Medium
437	path-sum-iii			Easy
438	find-all-anagrams-in-a-string			Easy
439	ternary-expression-parser	🔒		Medium
440	k-th-smallest-in-lexicographical-order			Hard
441	arranging-coins			Easy
444	sequence-reconstruction	🔒		Medium
446	arithmetic-slices-ii-subsequence			Hard
447	number-of-boomerangs			Easy
452	minimum-number-of-arrows-to-burst-balloons			Medium
453	minimum-moves-to-equal-array-elements			Easy

Name		Name	Last commit message	Last commit date
Latest commit History 21 Commits
001-two-sum		001-two-sum
002-add-two-numbers		002-add-two-numbers
003-longest-substring-without-repeating-characters		003-longest-substring-without-repeating-characters
004-median-of-two-sorted-arrays		004-median-of-two-sorted-arrays
005-longest-palindromic-substring		005-longest-palindromic-substring
006-zigzag-conversion		006-zigzag-conversion
007-reverse-integer		007-reverse-integer
008-string-to-integer-atoi		008-string-to-integer-atoi
009-palindrome-number		009-palindrome-number
010-regular-expression-matching		010-regular-expression-matching
011-container-with-most-water		011-container-with-most-water
012-integer-to-roman		012-integer-to-roman
013-roman-to-integer		013-roman-to-integer
014-longest-common-prefix		014-longest-common-prefix
015-3sum		015-3sum
016-3sum-closest		016-3sum-closest
017-letter-combinations-of-a-phone-number		017-letter-combinations-of-a-phone-number
019-remove-nth-node-from-end-of-list		019-remove-nth-node-from-end-of-list
020-valid-parentheses		020-valid-parentheses
021-merge-two-sorted-lists		021-merge-two-sorted-lists
023-merge-k-sorted-lists		023-merge-k-sorted-lists
024-swap-nodes-in-pairs		024-swap-nodes-in-pairs
026-remove-duplicates-from-sorted-array		026-remove-duplicates-from-sorted-array
027-remove-element		027-remove-element
028-implement-strstr		028-implement-strstr
034-search-for-a-range		034-search-for-a-range
038-count-and-say		038-count-and-say
039-combination-sum		039-combination-sum
107-binary-tree-level-order-traversal-ii		107-binary-tree-level-order-traversal-ii
111-minimum-depth-of-binary-tree		111-minimum-depth-of-binary-tree
125-valid-palindrome		125-valid-palindrome
420-strong-password-checker		420-strong-password-checker
demo		demo
old		old
README.md		README.md
README_leetcode_generate.md		README_leetcode_generate.md
config.cfg		config.cfg
leetcode_generate.py		leetcode_generate.py

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