2563번

2563

#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;

int map[100][100] = {false,};
int main() {
    int sum = 0;
    int n;
    cin>>n;
    for(int i=0; i<n; i++) {
        int a,b;
        cin>>a>>b;
        int end_a = a+10;
        int end_b = b+10;

        for(int j=a; j<end_a; j++) {
            for(int z=b; z<end_b; z++) {
                if(!map[j][z]) {
                    map[j][z] = true;
                    sum++;
                }
            }
        }
    }
    cout<<sum;
}