Combinations Given two integers n and k, return all possible combinations of k numbers out of 1 ... n. For example,If n = 4 and k = 2, a solution is: [  [2,4],  [3,4],  [2,3],  [1,2],  [1,3],  [1,4],] SLOUTION 1: 一段时间不写真心容易不记得. 这是一道典型的模板题.以下是模板写法. 1.…

Permutations Given a collection of numbers, return all possible permutations. For example,[1,2,3] have the following permutations:[1,2,3], [1,3,2], [2,1,3], [2,3,1], [3,1,2], and [3,2,1]. SOLUTION 1: 经典的递归回溯题目,一次ACCEPT. 请也参考上一个题目LeetCode: Combination…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 方法一:递归 方法二:回溯法 日期 题目地址:https://leetcode.com/problems/combinations/description/ 题目描述 Given two integers n and k, return all possible combinations of k numbers out of 1 - n. For…

1.题目描述 Given a string s, partition s such that every substring of the partition is a palindrome. Return all possible palindrome partitioning of s. For example, given s = "aab", Return [ ["aa","b"], ["a","a"…

自己做得LeetCode的题解,使用C++语言. 说明:大多数自己做得,部分参考别人的思路,仅供参考; GitHub地址:https://github.com/amazingyyc/The-Solutions-of-leetcode…

剑指offer之面试题37 两个链表的第一个公共结点 提交网址: http://www.nowcoder.com/practice/6ab1d9a29e88450685099d45c9e31e46?tpId=13&tqId=11189 leetcode 160: https://leetcode.com/problems/intersection-of-two-linked-lists/ 参与人数:3252   时间限制:1秒   空间限制:32768K 本题知识点: 链表 时间空间效率的平衡题…

Subsets Given a set of distinct integers, S, return all possible subsets. Note: Elements in a subset must be in non-descending order. The solution set must not contain duplicate subsets. For example, If S = [1,2,3], a solution is: [ [3], [1], [2], [1…

Triangle Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numbers on the row below. For example, given the following triangle[     [2],    [3,4],   [6,5,7],  [4,1,8,3]]The minimum path sum from top to…

isSameTree1 Given two binary trees, write a function to check if they are equal or not. Two binary trees are considered equal if they are structurally identical and the nodes have the same value. SOLUTION 1 & SOLUTION 2: 以下是递归及非递归解法: 1. 递归解法就是判断当前节点是…

Sudoku SolverWrite a program to solve a Sudoku puzzle by filling the empty cells. Empty cells are indicated by the character '.'. You may assume that there will be only one unique solution.…