- [0001.two-sum](./problems/1.two-sum.md)

- [0020.Valid Parentheses](./problems/20.valid-parentheses.md)

- [0021.MergeTwoSortedLists](./problems/21.merge-two-sorted-lists.md)

- [0026.remove-duplicates-from-sorted-array](./problems/26.remove-duplicates-from-sorted-array.md)

- [0053.maximum-sum-subarray](./problems/53.maximum-sum-subarray-cn.md)

- [0088.merge-sorted-array](./problems/88.merge-sorted-array.md)

- [0101.symmetric-tree](./problems/101.symmetric-tree.md)🆕

- [0104.maximum-depth-of-binary-tree](./problems/104.maximum-depth-of-binary-tree.md)

- [0108.convert-sorted-array-to-binary-search-tree](./problems/108.convert-sorted-array-to-binary-search-tree.md)

- [0121.best-time-to-buy-and-sell-stock](./problems/121.best-time-to-buy-and-sell-stock.md)

- [0122.best-time-to-buy-and-sell-stock-ii](./problems/122.best-time-to-buy-and-sell-stock-ii.md)

- [0125.valid-palindrome](./problems/125.valid-palindrome.md)

- [0136.single-number](./problems/136.single-number.md)

- [0155.min-stack](./problems/155.min-stack.md) 🆕

- [0167.two-sum-ii-input-array-is-sorted](./problems/167.two-sum-ii-input-array-is-sorted.md)

- [0169.majority-element](./problems/169.majority-element.md)

- [0172.factorial-trailing-zeroes](./problems/172.factorial-trailing-zeroes.md)

- [0190.reverse-bits](./problems/190.reverse-bits.md)

- [0191.number-of-1-bits](./problems/191.number-of-1-bits.md)

- [0198.house-robber](./problems/198.house-robber.md)

- [0203.remove-linked-list-elements](./problems/203.remove-linked-list-elements.md)

- [0206.reverse-linked-list](./problems/206.reverse-linked-list.md)

- [0219.contains-duplicate-ii](./problems/219.contains-duplicate-ii.md)

- [0226.invert-binary-tree](./problems/226.invert-binary-tree.md)

- [0232.implement-queue-using-stacks](./problems/232.implement-queue-using-stacks.md) 🆕

- [0263.ugly-number](./problems/263.ugly-number.md)

- [0283.move-zeroes](./problems/283.move-zeroes.md)

- [0342.power-of-four](./problems/342.power-of-four.md)

- [0349.intersection-of-two-arrays](./problems/349.intersection-of-two-arrays.md)

- [0371.sum-of-two-integers](./problems/371.sum-of-two-integers.md)

- [0437.path-sum-iii](./problems/437.path-sum-iii.md) 🆕

- [0455.AssignCookies](./problems/455.AssignCookies.md) 🆕

- [0501.find-mode-in-binary-search-tree](./problems/501.Find-Mode-in-Binary-Search-Tree.md)🆕

- [0575.distribute-candies](./problems/575.distribute-candies.md)

- [0874.walking-robot-simulation](./problems/874.walking-robot-simulation.md) 🆕

- [1260.shift-2d-grid](./problems/1260.shift-2d-grid.md) 🆕

- [1332.remove-palindromic-subsequences](./problems/1332.remove-palindromic-subsequences.md) 🆕

- [0004.median-of-two-sorted-array](./problems/4.median-of-two-sorted-array.md)

- [0023.merge-k-sorted-lists](./problems/23.merge-k-sorted-lists.md)

- [0025.reverse-nodes-in-k-group](./problems/25.reverse-nodes-in-k-groups-cn.md)

- [0030.substring-with-concatenation-of-all-words](./problems/30.substring-with-concatenation-of-all-words.md)

- [0032.longest-valid-parentheses](./problems/32.longest-valid-parentheses.md)

- [0042.trapping-rain-water](./problems/42.trapping-rain-water.md)🖊

- [0052.N-Queens-II](./problems/52.N-Queens-II.md)

- [0084.largest-rectangle-in-histogram](./problems/84.largest-rectangle-in-histogram.md)

- [0085.maximal-rectangle](./problems/85.maximal-rectangle.md)

- [0124.binary-tree-maximum-path-sum](./problems/124.binary-tree-maximum-path-sum.md)

- [0128.longest-consecutive-sequence](./problems/128.longest-consecutive-sequence.md)

- [0145.binary-tree-postorder-traversal](./problems/145.binary-tree-postorder-traversal.md)

- [0212.word-search-ii](./problems/212.word-search-ii.md)

- [0239.sliding-window-maximum](./problems/239.sliding-window-maximum.md)

- [0295.find-median-from-data-stream](./problems/295.find-median-from-data-stream.md)

- [0301.remove-invalid-parentheses](./problems/301.remove-invalid-parentheses.md)

- [0312.burst-balloons](./problems/312.burst-balloons.md) 🆕

- [0335.self-crossPing](./problems/335.self-crossing.md)

- [0460.lfu-cache](./problems/460.lfu-cache.md)

- [0472.concatenated-words](./problems/472.concatenated-words.md) 🆕

- [0493.reverse-pairs](./problems/493.reverse-pairs.md) 🆕

- [0887.super-egg-drop](./problems/887.super-egg-drop.md)

- [0895.maximum-frequency-stack](./problems/895.maximum-frequency-stack.md) 🆕

- [1032.stream-of-characters](./problems/1032.stream-of-characters.md) 🆕

- [1168.optimize-water-distribution-in-a-village](./problems/1168.optimize-water-distribution-in-a-village-cn.md) 🆕

- [1449.form-largest-integer-with-digits-that-add-up-to-target](./problems/1449.form-largest-integer-with-digits-that-add-up-to-target.md) 🆕