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[每日一题] 3763. 数字矩阵

*DDL_GzmBlog 发布时间：2021-07-14 11:18:33 ，浏览量：5

前言
思路
CODE

前言

刚刚还在练倒车入库,特意休息的时候来补题

加油！奥里给！

这题应该也就codeforces A题水平 div2难度的

但是我竟然没一次过太逊了(泰拉了)

思路

每次需要变动两个数然后让这两个数*(-1)

因为要和最大傻子都知道如果全部负数都变正了那么和一定最大了

所以我们经可能多的让负数变正

所以我们讨论一下

两个负数的情况下都可以变正
三个负数必有一个是负

大胆假设,(负数个数奇数必有一个是负数) 然后对于那个负数让他经可能的 abs(绝对值)小就行这样就满足了和最大

CODE

#include 
#define  CYE cout


    
        
            
                
                
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