text: #include <bits/stdc++.h>
  
  using namespace std;
  int main() {
    // ifstream cin("b.in");
    ofstream cout("b.in");
    int T = 100000000;
    srand((unsigned)time(NULL)); //随机数种子
    for (int i = 1; i <= T; i++) {
      cout << rand() % 10000000 << " " << rand() % 10000000 << endl;
    }
    return 0;
  }