// Solution 1: This is a very challenging problem, maybe because it looked like one and proved exactly to be one. It's among the last few problem I solved on LeetCode. It took me hours to think it through and a
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53. 最大子数组和 - 给你一个整数数组 nums ,请你找出一个具有最大和的连续子数组(子数组最少包含一个元素),返回其最大和。 子数组 是数组中的一个连续部分。 示例 1: 输入:nums = [-2,1,-3,4,-1,2,1,-5,4] 输出:6 解释:连续子数组 [4,-1,2,1] 的和最大,为
给你一个二叉树的根节点root, 检查它是否轴对称。 示例1: 输入:root = [1,2,2,3,4,4,3]输出:true 示例2: 输入:root = [1,2,2,null,3,null,3]输出:false 提示: 树中节点数目在范围[1, 1000]内 -100 <= Node.val <= 100 进阶:你可以运用递归和迭代两种方法解决这个问题吗?
实现pow(x,n),即计算x的整数n次幂函数(即,xn)。 示例1: 输入:x = 2.00000, n = 10输出:1024.00000 示例2: 输入:x = 2.10000, n = 3输出:9.26100 示例3: 输入:x = 2.00000, n = -2输出:0.25000解释:2-2= 1/22= 1/4 = 0.25 提示: ...
给定一组不含重复元素的整数数组 nums,返回该数组所有可能的子集(幂集)。 说明:解集不能包含重复的子集。 示例: 输入: nums = [1,2,3] 输出: [ [3], [1], [2 ], [1,2,3], [1,3 ], [2,3], [1,2], [] ] 解题思路: 我们首先新建一个vector,初始化存在一个空的列表,然后我们每次复制...
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198.打家劫舍leetcode 221.最大正方形-> 进阶版：leetcode 85.最大矩形leetcode 238.除自身以外...
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testHead=testHead.next; } }if(!valid){break; }if(pre ==null){ pre=testHead; ret=pre; }else{ pre.next=testHead; } ListNode oldPre=current; ListNode next=current.next; current.next=testHead.next; pre=current; current=next;for(inti = 1; i < k; ++i){ ...