您用的是 goc 编译器吧怎么没有头文件
by LinGxIao_0230 @ 2023-03-26 16:28:52
@[LorryWayn](/user/959750) 就问头文件和```int main```是被您吃了吗
by codejiahui @ 2023-03-26 16:59:16
没有，头文件啥的我只是没粘上去
by LorryWayn @ 2023-03-26 17:28:19
@[codejiahui](/user/512407) 没有，头文件啥的我只是没粘上去
by LorryWayn @ 2023-03-26 17:28:46
@[LorryWayn](/user/959750) $10^4$的$0$呢？？？？也不知道您是脑抽了还是手残了
```cpp
#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 18:34:42
@[LorryWayn](/user/959750) 还有，
```
for(i=0;i<=l;i++){
tree[i]=i;
}
```
根本不需要
by codejiahui @ 2023-03-26 18:35:50
@[codejiahui](/user/512407) 10的四次方是啥，我没用这个啊
by LorryWayn @ 2023-03-26 22:27:03
@[LorryWayn](/user/959750) ```int tree[1001]={0};```
by codejiahui @ 2023-03-27 18:11:02
@[codejiahui](/user/512407) 明白了谢谢！
by LorryWayn @ 2023-03-27 18:23:12