Given a positive integer, return its corresponding column title as appear in an Excel s...
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Leetcode 168. Excel Sheet Column Title
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Leetcode 162. Find Peak Element
A peak element is an element that is greater than its neighbors.Given an input array wh...
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Leetcode 167. Two Sum II - Input array is sorted
Given an array of integers that is already sorted in ascending order, find two numbers ...
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Leetcode 154. Find Minimum in Rotated Sorted Array II
Follow up for "Find Minimum in Rotated Sorted Array":What if duplicates are allowed? Wo...
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Leetcode 153. Find Minimum in Rotated Sorted Array
Suppose an array sorted in ascending order is rotated at some pivot unknown to you befo...
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Leetcode 155. Min Stack
Design a stack that supports push, pop, top, and retrieving the minimum element in cons...
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Leetcode 147. Insertion Sort List
Sort a linked list using insertion sort. 分析 使用插入排序，排序一個(gè)鏈表。先列出首節(jié)點(diǎn)，然后依次對(duì)比節(jié)點(diǎn)大小，然后插入到合適的位置即...
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Leetcode 142. Linked List Cycle II
Given a linked list, return the node where the cycle begins. If there is no cycle, retu...
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Leetcode 141. Linked List Cycle
Given a linked list, determine if it has a cycle in it. Follow up:Can you solve it with...
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Leetcode 138. Copy List with Random Pointer
A linked list is given such that each node contains an additional random pointer which ...
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Leetcode 134. Gas Station
There are N gas stations along a circular route, where the amount of gas at station i i...
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Leetcode 129. Sum Root to Leaf Numbers
Given a binary tree containing digits from 0-9 only, each root-to-leaf path could repre...
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Leetcode 106. Construct Binary Tree from Inorder and Postorder Traversal
題目 Given inorder and postorder traversal of a tree, construct the binary tree. Note:You...
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Leetcode 89. Gray Code
The gray code is a binary numeral system where two successive values differ in only one...
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Leetcode 22. Generate Parentheses
Given n pairs of parentheses, write a function to generate all combinations of well-for...
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Leetcode 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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Leetcode 137. Single Number II
Given an array of integers, every element appears three times except for one, which app...
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Leetcode 136. Single Number
Given an array of integers, every element appears twice except for one. Find that singl...
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Leetcode 125. Valid Palindrome
Given a string, determine if it is a palindrome, considering only alphanumeric characte...