不知道为何全是re，编译器上测试正确，求指出

LorryWayn @ 2023-03-26 16:25:10

int tree[1001]={0};
scanf("%d %d",&l,&m);
for(i=0;i<=l;i++){
    tree[i]=i;
}
    for(i=0;i<m;i++){
    scanf("%d %d",&u,&v);

        for(j=u;j<=v;j++){
            tree[j]=-1;
        }

}
for(i=0;i<=l;i++){
    if(tree[i]!=-1){
        sum++;
    }
}
printf("%d\n",sum);
return 0;

by LinGxIao_0230 @ 2023-03-26 16:28:52

您用的是 goc 编译器吧怎么没有头文件

by codejiahui @ 2023-03-26 16:59:16

@LorryWayn 就问头文件和int main是被您吃了吗

by LorryWayn @ 2023-03-26 17:28:19

没有，头文件啥的我只是没粘上去

by LorryWayn @ 2023-03-26 17:28:46

@codejiahui 没有，头文件啥的我只是没粘上去

by codejiahui @ 2023-03-26 18:34:42

@LorryWayn 10^4的0呢？？？？也不知道您是脑抽了还是手残了

#include<cstdio>
#include<iostream>
#include<algorithm>
using namespace std;
int a[10010];
int main()
{
    int l,m,ans = 0;
    scanf("%d%d",&l,&m);
    for (int i = 1;i <= m;i++)
    {
        int x,y;
        scanf("%d%d",&x,&y);
        for (int j = x;j <= y;j++)
            a[j] = 1;
    }
    for (int i = 0;i <= l;i++)
        if (a[i] == 0)
            ans++;
    printf("%d\n",ans);
    return 0;
}

by codejiahui @ 2023-03-26 18:35:50

@LorryWayn 还有，

for(i=0;i<=l;i++){
    tree[i]=i;
}

根本不需要

by LorryWayn @ 2023-03-26 22:27:03

@codejiahui 10的四次方是啥，我没用这个啊

by codejiahui @ 2023-03-27 18:11:02

@LorryWayn int tree[1001]={0};

by LorryWayn @ 2023-03-27 18:23:12

@codejiahui 明白了谢谢！