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vector begin()返回指向第一个元素的迭代器 end()返回指向最后一个元素的迭代器 rbegin()返回指向最后一个元素的迭代器 rend()返回指向第一个元素的迭代器 size()返回容器的元素的个数 max_size()返回容器的最大的元素的个数 resize()重新调整容器的容量， 阅读全文
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Given a string s containing only digits, return all possible valid IP addresses that can be obtained from s. You can return them in any order. A valid 阅读全文
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Given an integer array nums of unique elements, return all possible subsets (the power set). The solution set must not contain duplicate subsets. Retu 阅读全文
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Write a program to solve a Sudoku puzzle by filling the empty cells. A sudoku solution must satisfy all of the following rules: Each of the digits 1-9 阅读全文
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Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses. Example 1: Input: n = 3 Output: ["((()))","(() 阅读全文
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The n-queens puzzle is the problem of placing n queens on an n x n chessboard such that no two queens attack each other. Given an integer n, return al 阅读全文
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Given a string containing digits from 2-9 inclusive, return all possible letter combinations that the number could represent. Return the answer in any 阅读全文
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Given a string s, find the length of the longest substring without repeating characters. Example 1: Input: s = "abcabcbb" Output: 3 Explanation: The a 阅读全文
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You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order, and each of their nodes conta 阅读全文
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Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target. You may assume that each inp 阅读全文