#include <iostream>
#include <vector>
using namespace std;
int main() {
vector<int> a[10];
a[0].push_back(2);
cout<<a[0][0];
a[0][0]=-1;
cout<<a[0][0];
return 0;
}
I2luY2x1ZGUgPGlvc3RyZWFtPgojaW5jbHVkZSA8dmVjdG9yPgp1c2luZyBuYW1lc3BhY2Ugc3RkOwoKaW50IG1haW4oKSB7Cgl2ZWN0b3I8aW50PiBhWzEwXTsKCWFbMF0ucHVzaF9iYWNrKDIpOwoJY291dDw8YVswXVswXTsKCWFbMF1bMF09LTE7Cgljb3V0PDxhWzBdWzBdOwoJcmV0dXJuIDA7Cn0=