Rotate Image You are given an n x n 2D matrix representing an image. Rotate the image by 90 degrees (clockwise). Follow up: Could you do this in-place? leetcode15， 最简单的想法，两重循环。 第一重循环是对于矩阵的层次（从外到内） 第二重循

考察点 广度优先遍历--层次遍历STL内容器的用法广度优先遍历的时候，首先应该想到的就是借助于队列。还需要在遍历下一层之前保存当前层节点的数量 Leetcode、代码很简单： class Solution { public:vector<vector<int> > levelOrderBottom(TreeNode*

Remove all elements from a linked list of integers that have valueval. ExampleGiven:1 --> 2 --> 6 --> 3 --> 4 --> 5 --> 6,val= 6Return:1 --> 2 --> 3 --> 4 --> 5 题解：链表的操作有两个常用的技巧：第一就是用递归

LeetCode——Word Break Question Given a non-empty string s and a dictionary wordDict containing a list of non-empty words, determine if s can be segmented into a space-separated sequence of one or more dictionary words. You may assume the dictionary does

题目链接：https://leetcode.com/problems/super-egg-drop/ 题意：给你K个鸡蛋以及一栋N层楼的建筑，已知存在某一个楼层F(0<=F<=N)，在不高于F的楼层扔鸡蛋不会碎，鸡蛋碎了不能再用，没碎可以继续使用，问不论F的大

直接看答案。。 1 class Solution { 2 public: 3 int ladderLength(string start, string end, unordered_set<string> &dict) { 4 // Start typing your C/C++ solution below 5 // DO NOT write int main() function 6 if (start.size() != end.size(

题目描述： Design a stack that supports push, pop, top, and retrieving the minimum element in constant time.push(x) -- Push element x onto stack.pop() -- Removes the element on top of the stack.top() -- Get the top element.getMin() -- Retrieve the

189. Rotate Array Rotate an array ofnelements to the right byksteps. For example, withn= 7 andk= 3, the array[1,2,3,4,5,6,7]is rotated to[5,6,7,1,2,3,4]. java代码: public class Solution {public void rotate(int[] nums, int k) {k=k%nums.length;i

1.题目leetcode 5？Given an array with n objects colored red, white or blue, sort them so that objects of the same color are adjacent, with the colors in the order red, white and blue.Here, we will use the integers 0, 1, and 2 to represent the color red,

一.题目链接：https://leetcode.com/problems/reverse-integer/ 二.题目大意： 　　给定一个整数，要求反转该整数之后再返回；如果归返回的整数超过了int型整数的表示范围，则返回0。例如：输入123，返回321。 leetcode java，三.