#include <bits/stdc++.h>


using namespace std;

int n, q, x, y, op, k;
vector <int, vector <int> > v;
int main(){
	cin >> n >> q;
    vector <int, vector <int> > v(n);
	while (q--){
		cin >> op;
		if (op == 1){
			cin >> x >>y >> k;
			v[x][y] = k;
		}else{
			cin >> x >>y;
			cout << v[x][y];
		}
	}
	
	return 0;
}

CE信息：

是什么错了啊喂