#include <ioatream>
改为
#include <iostream>
by 斯德哥尔摩 @ 2018-04-05 19:35:23
您学过C++吗。。。
by Siyuan @ 2018-04-05 20:25:20
```cpp
using namespace std;
```
改成
```cpp
std enjoy using namespace;
```
by Mr_Wu @ 2018-04-05 20:29:00
改为
```cpp
#include <iostream>
int main()
{
std::ios::sync_with_stdio(false);
static int a[100],b[100],L,M,sum=0,q;
std::cin>>L>>M;
for(register unsigned int i=0;i<M;++i){
std::cin>>a[i]>>b[i];
sum+=a[i]+b[i];
}
q=L-sum+1;
std::cout<<q<<'\n';
}
```
by middle_set @ 2018-04-05 20:47:43