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Chess

a guest Apr 18th, 2019 94 Never
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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. using ll = long long;
  4. using ld = long double;
  5. int main(){
  6.     ios_base::sync_with_stdio(false);
  7.     cin.tie(nullptr);
  8.   int n,m;
  9.   cin>>n>>m;
  10.   set<int> used[2];
  11.   for(int i=0;i<m;i++){
  12.     int x,y;
  13.     cin>>x>>y;
  14.     used[0].insert(x + y);
  15.     used[1].insert(x - y);
  16.   }
  17.   int ans = 0;
  18.   for(int x=1;x<=n;x++){
  19.     for(int y=1;y<=n;y++){
  20.       if(used[0].find(x + y) == used[0].end())
  21.         if(used[1].find(x - y) == used[1].end())
  22.           ans++;
  23.     }
  24.   }
  25.   cout<<ans<<endl;
  26.   return 0;
  27. }
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