Problem 1: Given an array of real number with length (n2 + 1) A: a1,  a2, ... , an2+1. Prove that there is either an increasing or a decreasing subarray of A with length (n + 1). Proof: In order to prove the proposition, we just need to prove that th…

Given an array A of integers, a ramp is a tuple (i, j) for which i < j and A[i] <= A[j].  The width of such a ramp is j - i. Find the maximum width of a ramp in A.  If one doesn't exist, return 0. Example 1: Input: [6,0,8,2,1,5] Output: 4 Explanatio…

B. Array Sharpening time limit per test1 second memory limit per test256 megabytes inputstandard input outputstandard output You're given an array a1,-,an of n non-negative integers. Let's call it sharpened if and only if there exists an integer 1≤k≤…

You are given an m * n matrix, mat, and an integer k, which has its rows sorted in non-decreasing order. You are allowed to choose exactly 1 element from each row to form an array. Return the Kth smallest array sum among all possible arrays. Example…

665. 非递减数列 665. Non-decreasing Array 题目描述 给定一个长度为 n 的整数数组,你的任务是判断在最多改变 1 个元素的情况下,该数组能否变成一个非递减数列. 我们是这样定义一个非递减数列的: 对于数组中所有的 i (1 <= i < n),满足 array[i] <= array[i + 1]. LeetCode665. Non-decreasing Array 示例 1: 输入: [4,2,3] 输出: True 解释: 你可以通过把第一个 4 变成…

problem 665. Non-decreasing Array 题意:是否能够将数组转换为非减数组. solution: 难点在于理解如何对需要修改的元素进行赋值: class Solution { public: bool checkPossibility(vector<int>& nums) { , n = nums.size(); ; i<n; i++) { ]) { ) return false; || nums[i-] <= nums[i]) nums[i-]…

作者: 负雪明烛 id: fuxuemingzhu 公众号:每日算法题 本文关键词:数组,array,非递减,遍历,python,C++ 目录 题目描述 题目大意 解题方法 一.错误代码 二.举例分析 三.归纳总结 代码 刷题心得 日期 题目地址:https://leetcode-cn.com/problems/non-decreasing-array/ 题目描述 给你一个长度为 n 的整数数组,请你判断在 最多 改变 1 个元素的情况下,该数组能否变成一个非递减数列. 我们是这样定义一个非递减…

Question 665. Non-decreasing Array Solution 题目大意: 思路:当前判断2的时候可以将当前元素2变为4,也可以将上一个元素4变为2,再判断两变化后是否满足要求. Java实现: public boolean checkPossibility(int[] nums) { if (nums == null || nums.length < 3) return true; int count = 0; // 判断前2个 if (nums[1] < nums[…

Given an array with n integers, your task is to check if it could become non-decreasing by modifying at most 1 element. We define an array is non-decreasing if array[i] <= array[i + 1] holds for every i (1 <= i < n). Example 1: Input: [4,2,3] Out…

Given an array with n integers, your task is to check if it could become non-decreasing by modifying at most 1 element. We define an array is non-decreasing if array[i] <= array[i + 1] holds for every i (1 <= i < n). Example 1: Input: [4,2,3] Out…