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Sun Feb 25 2024 07:39:50 GMT+0000 (Coordinated Universal Time)

Saved by @hajinjang0714

#include <iostream>
using namespace std;
int main()
{
  int arr[100][100]{0}, n, i, j ,k, x, y, cnt=0;
  cin>>n;
  for(k=1;k<=n;k++)
  {
    cin>>x>>y;
    for(i=0;i<=9;i++)
    {
      for(j=0;j<=9;j++)
      {
        if(arr[x+j][y+i]==0)
        {
          arr[x+j][y+i]++;
          cnt++;
        }
      }
    }
  }
  cout<<cnt;
  return 0;
}
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https://www.acmicpc.net/submit/2563/73557243