HackMD
Leetcode Python: Selected Problems
- Daily practice: 2 problems per day
- 2024-09-15 policy change: 為了提高難度，選題原則是 Easy with low acceptance 和 Medium with high acceptance。
- Arthur's solutions: colab
- Ann's solutions: colab
- Thoughts
- 寫一個爬蟲去 leetcode 上面把每一題的難度抓回來標記在題目後，例如：283. Move Zeroes Easy
- Sample code link
- Issue: 不知道為什麼爬某些頁的時候會失敗，沒有觀察到發生錯誤的規律。
- (2024-10-03) Finding: ChatGPT 知道每一題的難度?!
- Sample code link
- 寫一個爬蟲去 leetcode 上面把每一題的難度抓回來標記在題目後，例如：283. Move Zeroes Easy
- 安的問題集：程式語言篇
TODO
567. Permutation in String Medium
https://leetcode.com/problems/permutation-in-string/
401. Binary Watch Easy
https://leetcode.com/problems/binary-watch/
168. Excel Sheet Column Title Easy
https://leetcode.com/problems/excel-sheet-column-title/
137. Single Number II Medium
https://leetcode.com/problems/single-number-ii/
1329. Sort the Matrix Diagonally Medium
https://leetcode.com/problems/sort-the-matrix-diagonally/
343. Integer Break Medium
https://leetcode.com/problems/integer-break/
707. Design Linked List Medium
https://leetcode.com/problems/design-linked-list/
696. Count Binary Substrings Easy
https://leetcode.com/problems/count-binary-substrings/
2025-03-29
2025-02-18
90. Subsets II Medium
https://leetcode.com/problems/subsets-ii/
2025-02-14
89. Gray Code Medium
https://leetcode.com/problems/gray-code/
2025-02-12
783. Minimum Distance Between BST Nodes Easy
https://leetcode.com/problems/minimum-distance-between-bst-nodes/
230. Kth Smallest Element in a BST Medium
https://leetcode.com/problems/kth-smallest-element-in-a-bst/
2025-01-15
703. Kth Largest Element in a Stream Easy
https://leetcode.com/problems/kth-largest-element-in-a-stream/
693. Binary Number with Alternating Bits Easy
https://leetcode.com/problems/binary-number-with-alternating-bits/
671. Second Minimum Node In a Binary Tree
https://leetcode.com/problems/second-minimum-node-in-a-binary-tree/
2025-01-14
234. Palindrome Linked List Easy
https://leetcode.com/problems/palindrome-linked-list/
697. Degree of an Array Easy
https://leetcode.com/problems/degree-of-an-array/
2025-01-13
141. Linked List Cycle Easy
https://leetcode.com/problems/linked-list-cycle/
114. Flatten Binary Tree to Linked List Medium
https://leetcode.com/problems/flatten-binary-tree-to-linked-list/
1619. Mean of Array After Removing Some Elements Easy
https://leetcode.com/problems/mean-of-array-after-removing-some-elements/
2025-01-11
914. X of a Kind in a Deck of Cards Easy
https://leetcode.com/problems/x-of-a-kind-in-a-deck-of-cards/
20. Valid Parentheses Easy
https://leetcode.com/problems/valid-parentheses/description/
19. Remove Nth Node From End of List Medium
https://leetcode.com/problems/remove-nth-node-from-end-of-list/
2025-01-10
1984. Minimum Difference Between Highest and Lowest of K Scores Easy
https://leetcode.com/problems/minimum-difference-between-highest-and-lowest-of-k-scores/
3364. Minimum Positive Sum Subarray Easy
https://leetcode.com/problems/minimum-positive-sum-subarray/
3270. Find the Key of the Numbers Easy
https://leetcode.com/problems/find-the-key-of-the-numbers/
179. Largest Number Medium
https://leetcode.com/problems/largest-number/
34. Find First and Last Position of Element in Sorted Array Medium
https://leetcode.com/problems/find-first-and-last-position-of-element-in-sorted-array/
69. Sqrt(x) Easy
https://leetcode.com/problems/sqrtx/
2025-01-09
563. Binary Tree Tilt Easy
https://leetcode.com/problems/binary-tree-tilt/
559. Maximum Depth of N-ary Tree Easy
https://leetcode.com/problems/maximum-depth-of-n-ary-tree/
561. Array Partition Easy
https://leetcode.com/problems/array-partition/
2025-01-06
2160. Minimum Sum of Four Digit Number After Splitting Digits Easy
https://leetcode.com/problems/minimum-sum-of-four-digit-number-after-splitting-digits
2544. Alternating Digit Sum Easy
https://leetcode.com/problems/alternating-digit-sum/
2553. Separate the Digits in an Array Easy
https://leetcode.com/problems/separate-the-digits-in-an-array/
2180. Count Integers With Even Digit Sum Easy
https://leetcode.com/problems/count-integers-with-even-digit-sum/
1945. Sum of Digits of String After Convert Easy
https://leetcode.com/problems/sum-of-digits-of-string-after-convert/
3300. Minimum Element After Replacement With Digit Sum Easy
https://leetcode.com/problems/minimum-element-after-replacement-with-digit-sum/
2025-01-02
543. Diameter of Binary Tree Easy
https://leetcode.com/problems/diameter-of-binary-tree/description/
102. Binary Tree Level Order Traversal Medium
https://leetcode.com/problems/binary-tree-level-order-traversal/
107. Binary Tree Level Order Traversal II Medium
https://leetcode.com/problems/binary-tree-level-order-traversal-ii/
637. Average of Levels in Binary Tree Easy
https://leetcode.com/problems/average-of-levels-in-binary-tree/
1323. Maximum 69 Number Easy
https://leetcode.com/problems/maximum-69-number/
1716. Calculate Money in Leetcode Bank Easy
https://leetcode.com/problems/calculate-money-in-leetcode-bank/
2025-01-01
204. Count Primes Medium
https://leetcode.com/problems/count-primes/
240. Search a 2D Matrix II Medium
https://leetcode.com/problems/search-a-2d-matrix-ii/
40. Combination Sum II Medium
https://leetcode.com/problems/combination-sum-ii/
2024-12-31
75. Sort Colors Medium
https://leetcode.com/problems/sort-colors/
77. Combinations Medium
https://leetcode.com/problems/combinations/
73. Set Matrix Zeroes Medium
https://leetcode.com/problems/set-matrix-zeroes/
29. Divide Two Integers Medium
https://leetcode.com/problems/divide-two-integers/
121. Best Time to Buy and Sell Stock Easy
https://leetcode.com/problems/best-time-to-buy-and-sell-stock/
225. Implement Stack using Queues Easy
https://leetcode.com/problems/implement-stack-using-queues/
232. Implement Queue using Stacks Easy
https://leetcode.com/problems/implement-queue-using-stacks/
287. Find the Duplicate Number Medium
https://leetcode.com/problems/find-the-duplicate-number/
326. Power of Three Easy
https://leetcode.com/problems/power-of-three/
342. Power of Four Easy
https://leetcode.com/problems/power-of-four/
371. Sum of Two Integers Medium
https://leetcode.com/problems/sum-of-two-integers/
392. Is Subsequence Easy
https://leetcode.com/problems/is-subsequence/
412. Fizz Buzz Easy
https://leetcode.com/problems/fizz-buzz/
2024-12-30
566. Reshape the Matrix Easy
https://leetcode.com/problems/reshape-the-matrix/
2022. Convert 1D Array Into 2D Array Easy
https://leetcode.com/problems/convert-1d-array-into-2d-array/
2024-12-26
3079. Find the Sum of Encrypted Integers Easy
https://leetcode.com/problems/find-the-sum-of-encrypted-integers/
2864. Maximum Odd Binary Number Easy
https://leetcode.com/problems/maximum-odd-binary-number/
2937. Make Three Strings Equal Easy
https://leetcode.com/problems/make-three-strings-equal/
2024-12-25
2206. Divide Array Into Equal Pairs Easy
https://leetcode.com/problems/divide-array-into-equal-pairs/
762. Prime Number of Set Bits in Binary Representation Easy
https://leetcode.com/problems/prime-number-of-set-bits-in-binary-representation/
2024-12-23
2923. Find Champion I Easy
https://leetcode.com/problems/find-champion-i/
476. Number Complement Easy
https://leetcode.com/problems/number-complement/
482. License Key Formatting Easy
https://leetcode.com/problems/license-key-formatting/
2024-12-20
2367. Number of Arithmetic Triplets Easy
https://leetcode.com/problems/number-of-arithmetic-triplets/
2873. Maximum Value of an Ordered Triplet I Easy
https://leetcode.com/problems/maximum-value-of-an-ordered-triplet-i/
2024-12-19
18. 4Sum Medium
https://leetcode.com/problems/4sum/
1995. Count Special Quadruplets Easy
https://leetcode.com/problems/count-special-quadruplets/
1534. Count Good Triplets Easy
https://leetcode.com/problems/count-good-triplets/
2475. Number of Unequal Triplets in Array Easy
https://leetcode.com/problems/number-of-unequal-triplets-in-array/
2024-12-18
2309. Greatest English Letter in Upper and Lower Case Easy
https://leetcode.com/problems/greatest-english-letter-in-upper-and-lower-case/
3120. Count the Number of Special Characters I Easy
https://leetcode.com/problems/count-the-number-of-special-characters-i/
3121. Count the Number of Special Characters II Medium
https://leetcode.com/problems/count-the-number-of-special-characters-ii/
3162. Find the Number of Good Pairs I Easy
https://leetcode.com/problems/find-the-number-of-good-pairs-i/
3142. Check if Grid Satisfies Conditions Easy
https://leetcode.com/problems/check-if-grid-satisfies-conditions/
151. Reverse Words in a String Medium
https://leetcode.com/problems/reverse-words-in-a-string/
189. Rotate Array Medium
https://leetcode.com/problems/rotate-array/
61. Rotate List Medium
https://leetcode.com/problems/rotate-list/
8. String to Integer (atoi) Medium
https://leetcode.com/problems/string-to-integer-atoi/
15. 3Sum Medium
https://leetcode.com/problems/3sum/
2024-12-17
74. Search a 2D Matrix Medium
https://leetcode.com/problems/search-a-2d-matrix/
2024-12-12
2239. Find Closest Number to Zero Easy
https://leetcode.com/problems/find-closest-number-to-zero/
658. Find K Closest Elements Medium
https://leetcode.com/problems/find-k-closest-elements/
2024-12-11
2243. Calculate Digit Sum of a String Easy
https://leetcode.com/problems/calculate-digit-sum-of-a-string/
2221. Find Triangular Sum of an Array Medium
https://leetcode.com/problems/find-triangular-sum-of-an-array/
2293. Min Max Game Easy
https://leetcode.com/problems/min-max-game/
394. Decode String Medium
https://leetcode.com/problems/decode-string/
726. Number of Atoms Hard
https://leetcode.com/problems/number-of-atoms/
2024-12-10
1360. Number of Days Between Two Dates Easy
https://leetcode.com/problems/number-of-days-between-two-dates/
2409. Count Days Spent Together Easy
https://leetcode.com/problems/count-days-spent-together/
2224. Minimum Number of Operations to Convert Time Easy
https://leetcode.com/problems/minimum-number-of-operations-to-convert-time/
2241. Design an ATM Machine Medium
https://leetcode.com/problems/design-an-atm-machine/
2024-12-09
43. Multiply Strings Medium
https://leetcode.com/problems/multiply-strings/
2288. Apply Discount to Prices Medium
https://leetcode.com/problems/apply-discount-to-prices/
2024-12-06
2506. Count Pairs Of Similar Strings Easy
https://leetcode.com/problems/count-pairs-of-similar-strings/
451. Sort Characters By Frequency Medium
https://leetcode.com/problems/sort-characters-by-frequency/
2024-12-05
2899. Last Visited Integers Easy
https://leetcode.com/problems/last-visited-integers/
609. Find Duplicate File in System Medium
https://leetcode.com/problems/find-duplicate-file-in-system/
599. Minimum Index Sum of Two Lists Easy
https://leetcode.com/problems/minimum-index-sum-of-two-lists/
2506. Count Pairs Of Similar Strings Easy
https://leetcode.com/problems/count-pairs-of-similar-strings/
451. Sort Characters By Frequency Medium
https://leetcode.com/problems/sort-characters-by-frequency/
2024-11-21
1979. Find Greatest Common Divisor of Array Easy
https://leetcode.com/problems/find-greatest-common-divisor-of-array/
1952. Three Divisors Easy
https://leetcode.com/problems/three-divisors/
2413. Smallest Even Multiple Easy
https://leetcode.com/problems/smallest-even-multiple/
2496. Maximum Value of a String in an Array Easy
https://leetcode.com/problems/maximum-value-of-a-string-in-an-array/
2024-11-20
400. Nth Digit Medium
https://leetcode.com/problems/nth-digit/
2024-11-19
374. Guess Number Higher or Lower Easy
https://leetcode.com/problems/guess-number-higher-or-lower/
405. Convert a Number to Hexadecimal Easy
https://leetcode.com/problems/convert-a-number-to-hexadecimal/
62. Unique Paths Medium
https://leetcode.com/problems/unique-paths/
2024-11-09
1025. Divisor Game Easy
https://leetcode.com/problems/divisor-game/
2024-11-04
929. Unique Email Addresses Easy
https://leetcode.com/problems/unique-email-addresses/
917. Reverse Only Letters Easy
https://leetcode.com/problems/reverse-only-letters/
2024-10-31
1071. Greatest Common Divisor of Strings Easy
https://leetcode.com/problems/greatest-common-divisor-of-strings/
2024-10-30
1002. Find Common Characters Easy
https://leetcode.com/problems/find-common-characters/
2024-10-29
976. Largest Perimeter Triangle Easy
https://leetcode.com/problems/largest-perimeter-triangle/
2024-10-26
1009. Complement of Base 10 Integer Easy
https://leetcode.com/problems/complement-of-base-10-integer/
557. Reverse Words in a String III Easy
https://leetcode.com/problems/reverse-words-in-a-string-iii/
2024-10-21
1046. Last Stone Weight Easy
https://leetcode.com/problems/last-stone-weight
2678. Number of Senior Citizens Easy
https://leetcode.com/problems/number-of-senior-citizens/
2024-10-15
1103. Distribute Candies to People Easy
https://leetcode.com/problems/distribute-candies-to-people/
2011. Final Value of Variable After Performing Operations Easy
https://leetcode.com/problems/final-value-of-variable-after-performing-operations/
2024-10-14
713. Subarray Product Less Than K Medium
https://leetcode.com/problems/subarray-product-less-than-k/
720. Longest Word in Dictionary Medium
https://leetcode.com/problems/longest-word-in-dictionary/
2024-10-12
709. To Lower Case Easy
https://leetcode.com/problems/to-lower-case/
2024-10-11
628. Maximum Product of Three Numbers Easy
https://leetcode.com/problems/maximum-product-of-three-numbers/
152. Maximum Product Subarray Medium
https://leetcode.com/problems/maximum-product-subarray/
2024-10-10
207. Course Schedule Medium
https://leetcode.com/problems/course-schedule/
210. Course Schedule II Medium
https://leetcode.com/problems/course-schedule-ii/
2024-10-09
219. Contains Duplicate II Easy
https://leetcode.com/problems/contains-duplicate-ii/
2024-10-08
997. Find the Town Judge Easy
https://leetcode.com/problems/find-the-town-judge/
2024-10-07
2785. Sort Vowels in a String Medium
https://leetcode.com/problems/sort-vowels-in-a-string/
2024-10-05
3280. Convert Date to Binary Easy
https://leetcode.com/problems/convert-date-to-binary/
2024-10-04
2729. Check if The Number is Fascinating Easy
https://leetcode.com/problems/check-if-the-number-is-fascinating/
1344. Angle Between Hands of a Clock Medium
https://leetcode.com/problems/angle-between-hands-of-a-clock/
2024-10-03
2748. Number of Beautiful Pairs Easy
https://leetcode.com/problems/number-of-beautiful-pairs/
2024-10-02
2769. Find the Maximum Achievable Number Easy
https://leetcode.com/problems/find-the-maximum-achievable-number/
2469. Convert the Temperature Easy
https://leetcode.com/problems/convert-the-temperature/
434. Number of Segments in a String Easy
https://leetcode.com/problems/number-of-segments-in-a-string/
2024-10-01
1013. Partition Array Into Three Parts With Equal Sum Easy
https://leetcode.com/problems/partition-array-into-three-parts-with-equal-sum/
2024-09-30
941. Valid Mountain Array Easy
https://leetcode.com/problems/valid-mountain-array/
2024-09-27
205. Isomorphic Strings Easy
https://leetcode.com/problems/isomorphic-strings/
890. Find and Replace Pattern Medium
https://leetcode.com/problems/find-and-replace-pattern/
2024-09-26
387. First Unique Character in a String Easy
https://leetcode.com/problems/first-unique-character-in-a-string/
1641. Count Sorted Vowel Strings Medium
https://leetcode.com/problems/count-sorted-vowel-strings/
2024-09-24
2591. Distribute Money to Maximum Children Easy
https://leetcode.com/problems/distribute-money-to-maximum-children/
48. Rotate Image Medium
https://leetcode.com/problems/rotate-image/
290. Word Pattern Easy
https://leetcode.com/problems/word-pattern/
2024-09-23
3024. Type of Triangle Easy
https://leetcode.com/problems/type-of-triangle
3211. Generate Binary Strings Without Adjacent Zeros Medium
https://leetcode.com/problems/generate-binary-strings-without-adjacent-zeros/
2024-09-20
2390. Removing Stars From a String Medium
https://leetcode.com/problems/removing-stars-from-a-string/
2024-09-19
2047. Number of Valid Words in a Sentence Easy
https://leetcode.com/problems/number-of-valid-words-in-a-sentence/
2024-09-18
349. Intersection of Two Arrays Easy
https://leetcode.com/problems/intersection-of-two-arrays/
414. Third Maximum Number Easy
https://leetcode.com/problems/third-maximum-number/
1282. Group the People Given the Group Size They Belong To Medium
https://leetcode.com/problems/group-the-people-given-the-group-size-they-belong-to/
2024-09-17
3136. Valid Word Easy
https://leetcode.com/problems/valid-word/
717. 1-bit and 2-bit Characters Easy
https://leetcode.com/problems/1-bit-and-2-bit-characters/
2024-09-16
605. Can Place Flowers Easy
https://leetcode.com/problems/can-place-flowers/
859. Buddy Strings Easy
https://leetcode.com/problems/buddy-strings/
2024-09-15
2423. Remove Letter To Equalize Frequency Easy
https://leetcode.com/problems/remove-letter-to-equalize-frequency/
2610. Convert an Array Into a 2D Array With Conditions Medium
https://leetcode.com/problems/convert-an-array-into-a-2d-array-with-conditions/
2024-09-10
724. Find Pivot Index Easy
https://leetcode.com/problems/find-pivot-index/
744. Find Smallest Letter Greater Than Target Easy
https://leetcode.com/problems/find-smallest-letter-greater-than-target/
2024-09-09
283. Move Zeroes Easy
https://leetcode.com/problems/move-zeroes/
409. Longest Palindrome Easy
https://leetcode.com/problems/longest-palindrome/description/
2024-08-29
1636. Sort Array by Increasing Frequency
https://leetcode.com/problems/sort-array-by-increasing-frequency/
1910. Remove All Occurrences of a Substring
https://leetcode.com/problems/remove-all-occurrences-of-a-substring/
2024-08-28
1313. Decompress Run-Length Encoded List
https://leetcode.com/problems/decompress-run-length-encoded-list/
1816. Truncate Sentence
https://leetcode.com/problems/truncate-sentence/
1773. Count Items Matching a Rule
https://leetcode.com/problems/count-items-matching-a-rule/
2024-08-27
347. Top K Frequent Elements
https://leetcode.com/problems/top-k-frequent-elements/
739. Daily Temperatures
https://leetcode.com/problems/daily-temperatures/
496. Next Greater Element I
https://leetcode.com/problems/next-greater-element-i
2024-08-23
442. Find All Duplicates in an Array
https://leetcode.com/problems/find-all-duplicates-in-an-array/description/
1329. Sort the Matrix Diagonally
https://leetcode.com/problems/sort-the-matrix-diagonally
2024-08-22
860. Lemonade Change
https://leetcode.com/problems/lemonade-change
2024-08-21
48. Rotate Image
https://leetcode.com/problems/rotate-image/
215. Kth Largest Element in an Array
https://leetcode.com/problems/kth-largest-element-in-an-array/
2024-08-20
3190. Find Minimum Operations to Make All Elements Divisible by Three
https://leetcode.com/problems/find-minimum-operations-to-make-all-elements-divisible-by-three
459. Repeated Substring Pattern
https://leetcode.com/problems/repeated-substring-pattern/
2024-08-16
345. Reverse Vowels of a String
https://leetcode.com/problems/reverse-vowels-of-a-string/
2024-08-15
2545. Sort the Students by Their Kth Score
https://leetcode.com/problems/sort-the-students-by-their-kth-score/
1828. Queries on Number of Points Inside a Circle
https://leetcode.com/problems/queries-on-number-of-points-inside-a-circle
2024-08-14
1752. Check if Array Is Sorted and Rotated
https://leetcode.com/problems/check-if-array-is-sorted-and-rotated/
2024-08-13
2610. Convert an Array Into a 2D Array With Conditions
https://leetcode.com/problems/convert-an-array-into-a-2d-array-with-conditions
1232. Check If It Is a Straight Line
https://leetcode.com/problems/check-if-it-is-a-straight-line/
2024-08-12
228. Summary Ranges
https://leetcode.com/problems/summary-ranges/
217. Contains Duplicate
https://leetcode.com/problems/contains-duplicate/
2024-08-07
2706. Buy Two Chocolates
https://leetcode.com/problems/buy-two-chocolates/
2024-08-06
2828. Check if a String Is an Acronym of Words
https://leetcode.com/problems/check-if-a-string-is-an-acronym-of-words/
832. Flipping an Image
https://leetcode.com/problems/flipping-an-image/
830. Positions of Large Groups
https://leetcode.com/problems/positions-of-large-groups/
2024-08-03
1436. Destination City
https://leetcode.com/problems/destination-city/
804. Unique Morse Code Words
https://leetcode.com/problems/unique-morse-code-words/
1732. Find the Highest Altitude
https://leetcode.com/problems/find-the-highest-altitude/
2024-08-02
1431. Kids With the Greatest Number of Candies
https://leetcode.com/problems/kids-with-the-greatest-number-of-candies/
2824. Count Pairs Whose Sum is Less than Target
https://leetcode.com/problems/count-pairs-whose-sum-is-less-than-target/
2024-07-31
1464. Maximum Product of Two Elements in an Array
https://leetcode.com/problems/maximum-product-of-two-elements-in-an-array/
1207. Unique Number of Occurrences
https://leetcode.com/problems/unique-number-of-occurrences/
2024-07-29
1662. Check If Two String Arrays are Equivalent
https://leetcode.com/problems/check-if-two-string-arrays-are-equivalent/
867. Transpose Matrix
https://leetcode.com/problems/transpose-matrix/
2024-07-27
1863. Sum of All Subset XOR Totals
https://leetcode.com/problems/sum-of-all-subset-xor-totals/
2024-07-24
2942. Find Words Containing Character
https://leetcode.com/problems/find-words-containing-character
1512. Number of Good Pairs
https://leetcode.com/problems/number-of-good-pairs/
2418. Sort the People
https://leetcode.com/problems/sort-the-people/
2974. Minimum Number Game
https://leetcode.com/problems/minimum-number-game/
2024-07-20
2373. Largest Local Values in a Matrix
https://leetcode.com/problems/largest-local-values-in-a-matrix/
1572. Matrix Diagonal Sum
https://leetcode.com/problems/matrix-diagonal-sum/
2024-07-19
2114. Maximum Number of Words Found in Sentences
https://leetcode.com/problems/maximum-number-of-words-found-in-sentences/
2024-07-15
2843. Count Symmetric Integers
https://leetcode.com/problems/count-symmetric-integers
2024-07-13
2124. Check if All A's Appears Before All B's
https://leetcode.com/problems/check-if-all-as-appears-before-all-bs
2024-07-11
1925. Count Square Sum Triples
https://leetcode.com/problems/count-square-sum-triples/
2024-07-10
1374. Generate a String With Characters That Have Odd Counts
https://leetcode.com/problems/generate-a-string-with-characters-that-have-odd-counts
2024-07-09
520. Detect Capital
https://leetcode.com/problems/detect-capital
2024-07-08
268. Missing Number
https://leetcode.com/problems/missing-number
2024-07-02
169. Majority Element
https://leetcode.com/problems/majority-element/
2024-06-30
70. Climbing Stairs
https://leetcode.com/problems/climbing-stairs/
1137. N-th Tribonacci Number
https://leetcode.com/problems/n-th-tribonacci-number/
1089. Duplicate Zeros
https://leetcode.com/problems/duplicate-zeros/
2024-06-29
896. Monotonic Array
https://leetcode.com/problems/monotonic-array/
1346. Check If N and Its Double Exist
https://leetcode.com/problems/check-if-n-and-its-double-exist/description/
2024-06-28
367. Valid Perfect Square
https://leetcode.com/problems/valid-perfect-square/
2215. Find the Difference of Two Arrays
https://leetcode.com/problems/find-the-difference-of-two-arrays/
263. Ugly Number
https://leetcode.com/problems/ugly-number/
2024-06-11
501. Find Mode in Binary Search Tree
https://leetcode.com/problems/find-mode-in-binary-search-tree/
415. Add Strings
https://leetcode.com/problems/add-strings/
83. Remove Duplicates from Sorted List
https://leetcode.com/problems/remove-duplicates-from-sorted-list/
2024-06-10
258. Add Digits
https://leetcode.com/problems/add-digits/
771. Jewels and Stones
https://leetcode.com/problems/jewels-and-stones/
389. Find the Difference
https://leetcode.com/problems/find-the-difference/
2024-06-08
509. Fibonacci Number
https://leetcode.com/problems/fibonacci-number/
338. Counting Bits
https://leetcode.com/problems/counting-bits/
2859. Sum of Values at Indices With K Set Bits
https://leetcode.com/problems/sum-of-values-at-indices-with-k-set-bits
2917. Find the K-or of an Array
https://leetcode.com/problems/find-the-k-or-of-an-array
50. Pow(x, n)
https://leetcode.com/problems/powx-n/
372. Super Pow
https://leetcode.com/problems/super-pow/
2024-06-06
1108. Defanging an IP Address
https://leetcode.com/problems/defanging-an-ip-address/
2788. Split Strings by Separator
https://leetcode.com/problems/split-strings-by-separator/
819. Most Common Word
https://leetcode.com/problems/most-common-word/
202. Happy Number
https://leetcode.com/problems/happy-number/
2024-06-05
1748. Sum of Unique Elements Easy
https://leetcode.com/problems/sum-of-unique-elements/
1528. Shuffle String Easy
https://leetcode.com/problems/shuffle-string/
2024-06-04
2000. Reverse Prefix of Word Easy
https://leetcode.com/problems/reverse-prefix-of-word/
2255. Count Prefixes of a Given String Easy
https://leetcode.com/problems/count-prefixes-of-a-given-string/
1929. Concatenation of Array Easy
https://leetcode.com/problems/concatenation-of-array/
1920. Build Array from Permutation Easy
https://leetcode.com/problems/build-array-from-permutation/
1480. Running Sum of 1d Array Easy
https://leetcode.com/problems/running-sum-of-1d-array/
1470. Shuffle the Array Easy
https://leetcode.com/problems/shuffle-the-array/
2574. Left and Right Sum Differences Easy
https://leetcode.com/problems/left-and-right-sum-differences/
2024-06-03
344. Reverse String Easy
https://leetcode.com/problems/reverse-string/
541. Reverse String II Easy
https://leetcode.com/problems/reverse-string-ii/
507. Perfect Number Easy
https://leetcode.com/problems/perfect-number/
2024-06-01
3110. Score of a String Medium
https://leetcode.com/problems/score-of-a-string/
231. Power of Two Easy
https://leetcode.com/problems/power-of-two/
977. Squares of a Sorted Array Easy
https://leetcode.com/problems/squares-of-a-sorted-array/
1971. Find if Path Exists in Graph Easy
https://leetcode.com/problems/find-if-path-exists-in-graph/
2024-05-26
203. Remove Linked List Elements Easy
https://leetcode.com/problems/remove-linked-list-elements/
2024-05-25
965. Univalued Binary Tree Easy
https://leetcode.com/problems/univalued-binary-tree/
404. Sum of Left Leaves Easy
https://leetcode.com/problems/sum-of-left-leaves/
160. Intersection of Two Linked Lists Easy
https://leetcode.com/problems/intersection-of-two-linked-lists/
26. Remove Duplicates from Sorted Array Easy
https://leetcode.com/problems/remove-duplicates-from-sorted-array/
110. Balanced Binary Tree Easy
https://leetcode.com/problems/balanced-binary-tree/
119. Pascal's Triangle II Easy
https://leetcode.com/problems/pascals-triangle-ii/
136. Single Number Easy
https://leetcode.com/problems/single-number/
938. Range Sum of BST Easy
https://leetcode.com/problems/range-sum-of-bst/
2024-05-24
104. Maximum Depth of Binary Tree Easy
https://leetcode.com/problems/maximum-depth-of-binary-tree/
190. Reverse Bits Easy
https://leetcode.com/problems/reverse-bits/
191. Number of 1 Bits Easy
https://leetcode.com/problems/number-of-1-bits/
257. Binary Tree Paths Easy
https://leetcode.com/problems/binary-tree-paths/
2024-05-23
28. Find the Index of the First Occurrence in a String Easy
https://leetcode.com/problems/find-the-index-of-the-first-occurrence-in-a-string/
58. Length of Last Word Easy
https://leetcode.com/problems/length-of-last-word/
66. Plus One Easy
https://leetcode.com/problems/plus-one/
67. Add Binary Easy
https://leetcode.com/problems/add-binary/
69. Sqrt(x) Easy
https://leetcode.com/problems/sqrtx/
100. Same Tree Easy
https://leetcode.com/problems/same-tree/
101. Symmetric Tree Easy
https://leetcode.com/problems/symmetric-tree/
111. Minimum Depth of Binary Tree Easy
https://leetcode.com/problems/minimum-depth-of-binary-tree/
125. Valid Palindrome Easy
https://leetcode.com/problems/valid-palindrome/
2024-05-22
27. Remove Element Easy
https://leetcode.com/problems/remove-element/
674. Longest Continuous Increasing Subsequence Easy
https://leetcode.com/problems/longest-continuous-increasing-subsequence/
35. Search Insert Position Easy
https://leetcode.com/problems/search-insert-position/
704. Binary Search Easy
https://leetcode.com/problems/binary-search/
680. Valid Palindrome II Medium
https://leetcode.com/problems/valid-palindrome-ii/
617. Merge Two Binary Trees Easy
https://leetcode.com/problems/merge-two-binary-trees/
589. N-ary Tree Preorder Traversal Easy
https://leetcode.com/problems/n-ary-tree-preorder-traversal/
590. N-ary Tree Postorder Traversal Easy
https://leetcode.com/problems/n-ary-tree-postorder-traversal/
572. Subtree of Another Tree Medium
https://leetcode.com/problems/subtree-of-another-tree/
53. Maximum Subarray Easy
https://leetcode.com/problems/maximum-subarray/
435. Non-overlapping Intervals Medium
https://leetcode.com/problems/non-overlapping-intervals/
322. Coin Change Medium
https://leetcode.com/problems/coin-change/
46. Permutations Medium
https://leetcode.com/problems/permutations/
47. Permutations II Medium
https://leetcode.com/problems/permutations-ii/
78. Subsets Medium
https://leetcode.com/problems/subsets/
39. Combination Sum Medium
https://leetcode.com/problems/combination-sum/
2024-05-21
118. Pascal's Triangle Easy
https://leetcode.com/problems/pascals-triangle/
21. Merge Two Sorted Lists Easy
https://leetcode.com/problems/merge-two-sorted-lists/
206. Reverse Linked List Easy
https://leetcode.com/problems/reverse-linked-list/
24. Swap Nodes in Pairs Medium
https://leetcode.com/problems/swap-nodes-in-pairs/
2. Add Two Numbers Medium
https://leetcode.com/problems/add-two-numbers/
108. Convert Sorted Array to Binary Search Tree Easy
https://leetcode.com/problems/convert-sorted-array-to-binary-search-tree/
109. Convert Sorted List to Binary Search Tree Medium
https://leetcode.com/problems/convert-sorted-list-to-binary-search-tree/
700. Search in a Binary Search Tree Easy
https://leetcode.com/problems/search-in-a-binary-search-tree/
701. Insert into a Binary Search Tree Medium
https://leetcode.com/problems/insert-into-a-binary-search-tree/
98. Validate Binary Search Tree Medium
https://leetcode.com/problems/validate-binary-search-tree/
226. Invert Binary Tree Easy
https://leetcode.com/problems/invert-binary-tree/
94. Binary Tree Inorder Traversal Easy
https://leetcode.com/problems/binary-tree-inorder-traversal/
144. Binary Tree Preorder Traversal Easy
https://leetcode.com/problems/binary-tree-preorder-traversal/
145. Binary Tree Postorder Traversal Easy
https://leetcode.com/problems/binary-tree-postorder-traversal/
112. Path Sum Easy
https://leetcode.com/problems/path-sum/
7. Reverse Integer Medium
https://leetcode.com/problems/reverse-integer/
20. Valid Parentheses Easy
https://leetcode.com/problems/valid-parentheses/
26. Remove Duplicates from Sorted Array Easy
https://leetcode.com/problems/remove-duplicates-from-sorted-array/
