#include <iostream>
#include <vector>
#include <algorithm>
#include <cstdio>
using namespace std;
struct Tank {
int id, r, c, tr, tc; // 目标行、目标列
};
int main() {
int N;
cin >> N;
vector<Tank> tanks(N);
for (int i = 0; i < N; i++) {
cin >> tanks[i].r >> tanks[i].c;
tanks[i].id = i + 1;
}
}
