我的做法是标记行和列，三重循环肯定超时，输出靠判断两个数组来判断整张地图
```cpp
#include<bits/stdc++.h>
using namespace std;
int h[5005],l[5005];
int main(){
int n,m,b,g;
cin >> n >> m >> b >> g;
for(int i=1;i<=b;i++){
int x,y;
cin >> x >> y;
for(int j=x;j<=y;j++){
h[j] = 1;
}
}
for(int i=1;i<=g;i++){
int x,y;
cin >> x >> y;
for(int j=x;j<=y;j++){
l[j] = 1;
}
}
int cnt = 0;
for(int i=1;i<=n;i++){
for(int j=1;j<=m;j++){
if(h[i] == 1||l[j] == 1) cnt++;
}
}
cout << cnt;
return 0;
}
```
by Li_Yichen @ 2024-02-01 20:41:02