传送门

#include <bits/stdc++.h>
using namespace std;
struct Node{
    long long ge[1000005];
}a[100005]; 
int main(){
    long long n, q;
    cin >> n >> q;
    for (int i = 1; i <= q; i++){
        long long x, ii, jj, kk;
        cin >> x;
        if(x == 1){
            cin >> ii >> jj >> kk;
            a[ii].ge[jj] = kk;
        }else if(x == 2){
            cin >> ii >> jj;
            cout << a[ii].ge[jj] << endl;
        }
    }
    return 0;
}