CodeForces 701B Cells Not Under Attack

统计一下有多少行多少列被占领了。

#pragma comment(linker, "/STACK:1024000000,1024000000")
#include<cstdio>
#include<cstring>
#include<cmath>
#include<algorithm>
#include<vector>
#include<map>
#include<set>
#include<queue>
#include<stack>
#include<iostream>
using namespace std;
typedef long long LL;
const double pi=acos(-1.0),eps=1e-8;
void File()
{
    freopen("D:\in.txt","r",stdin);
    freopen("D:\out.txt","w",stdout);
}
template <class T>
inline void read(T &x)
{
    char c = getchar(); x = 0;while(!isdigit(c)) c = getchar();
    while(isdigit(c)) { x = x * 10 + c - '0'; c = getchar();  }
}

const int maxn=100010;
int n,m,r[maxn],c[maxn];
LL sumr,sumc;

int main()
{
    scanf("%d%d",&n,&m);
    LL ans=(LL)n*(LL)n;
    for(int i=1;i<=m;i++)
    {
        int x,y; scanf("%d%d",&x,&y);
        if(r[x]==0) r[x]=1,sumr++;
        if(c[y]==0) c[y]=1,sumc++;
        printf("%lld ",ans-(LL)n*(sumr+sumc)+sumr*sumc);
    }
    return 0;
}