这为啥编译失败啊

zxfbit @ 2024-02-16 20:07:29

#include<iostream>

using namespace std;

int a[1010][1010],s[1010][1010],n,m;
int maxx=INT_MIN;
int main()
{
    cin>>n;
    for(int i=1;i<=n;i++)
        for(int j=1;j<=n;j++)
        {
            cin>>a[i][j];
            s[i][j]=s[i-1][j]+s[i][j-1]-s[i-1][j-1]+a[i][j];
        }
    int x1,x2,y1,y2;
    for(int x1=1;x1<=n;x1++)
        for(int y1=1;y1<=n;y1++)
            for(int x2=x1;x2<=n;x2++)
                for(int y2=y1;y2<=n;y2++)
                {
                    maxx=max(maxx,s[x2][y2]-s[x2][y1-1]-s[x1-1][y2]+s[x1-1][y1-1]);
                }
    cout<<maxx<<endl;
    return 0;
}

by zxfbit @ 2024-02-16 20:08:11

为啥编译失败啊

by HEROBRINEH @ 2024-02-16 20:13:25

#include <climits>

你少了这个东西，加到第2行，加了之后AC（亲测）

by HEROBRINEH @ 2024-02-16 20:14:04

给个关注呗

by QWQ_123 @ 2024-02-16 20:14:47

@zxfbit

/tmp/compiler_e52tvfsd/src:6:10: 错误：‘INT_MIN’在此作用域中尚未声明
    6 | int maxx=INT_MIN;
      |          ^~~~~~~
/tmp/compiler_e52tvfsd/src:2:1: 附注：‘INT_MIN’ is defined in header ‘<climits>’; did you forget to ‘#include <climits>’?
    1 | #include<iostream>
  +++ |+#include <climits>
    2 | 

by QWQ_123 @ 2024-02-16 20:15:46

@zxfbit 显然的 INT_MIN 不在 iostream 里，然后你可以直接用 bits/stdc++.h，当然也可以如同编译信息里面说的加上 climits。

by Lele_Programmer @ 2024-02-16 20:22:37

直接用 -0x7fffffff 不好吗

by zxfbit @ 2024-02-16 20:25:51

感谢，已关注

by zxfbit @ 2024-02-16 20:26:15

@QWQ_123 感谢，关注了