文/麥大人 01 “小時候，鄉(xiāng)愁是一枚小小的郵票，我在這頭，母親在那頭。長大后，鄉(xiāng)愁是一張窄窄的船票，我在這頭，新娘在那頭…” 很多年前，讀到余光中先生的這首《鄉(xiāng)愁》，當(dāng)時只...
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兒時的年味 | 回不去的是故鄉(xiāng)，到不了的是遠(yuǎn)方
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16. 3Sum Closest
Given an array nums of n integers and an integer target, find three integers in nums su...
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18. 4Sum
Given an array nums of n integers and an integer target, are there elements a, b, c, an...
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15. 3Sum
Given an array nums of n integers, are there elements a, b, c in nums such that a + b +...
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3. Longest Substring Without Repeating Characters
Given a string, find the length of the longest substring without repeating characters. ...
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106. Construct Binary Tree from Inorder and Postorder Traversal
Given inorder and postorder traversal of a tree, construct the binary tree. Note:You ma...
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105. Construct Binary Tree from Preorder and Inorder Traversal
Given preorder and inorder traversal of a tree, construct the binary tree. Note:You may...
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112. Path Sum
Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that ...
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108. Convert Sorted Array to Binary Search Tree
Given an array where elements are sorted in ascending order, convert it to a height bal...
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174. Dungeon Game
The demons had captured the princess (P) and imprisoned her in the bottom-right corner ...
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213. House Robber II
After robbing those houses on that street, the thief has found himself a new place for ...
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198. House Robber
You are a professional robber planning to rob houses along a street. Each house has a c...
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70. Climbing Stairs
You are climbing a stair case. It takes n steps to reach to the top. Each time you can ...
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64. Minimum Path Sum
Given a m x n grid filled with non-negative numbers, find a path from top left to botto...
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121. Best Time to Buy and Sell Stock
Say you have an array for which the ith element is the price of a given stock on day i....
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53. Maximum Subarray
開始動態(tài)規(guī)劃啦！Given an integer array nums, find the contiguous subarray (containing at least ...
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63. Unique Paths II
A robot is located at the top-left corner of a m x n grid (marked 'Start' in the diagra...
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206. Reverse Linked List
Reverse a singly linked list. 畫圖即可，創(chuàng)建兩個指針，一個pivot指向頭節(jié)點(diǎn)，可用于判斷是否反轉(zhuǎn)到最后一個，用pivot.next == nu...