为什么会超时

#include<iostream>
using namespace std;
long long b[10005];
int cnt = 0;
typedef struct Elem {
    long long a[10005];
 }Elem;

typedef struct Sqg {
    Elem* s;
    int length;
}Sqg;

void Lizi(Sqg& L,int n) {
    L.s = new Elem[n];
    L.length = 0;
}
void add(Sqg& L,int n1,int n2,long long n3) {
    L.s[n1].a[n2] = n3;
}
void Sreach(Sqg& L, int n1, int n2) {
    if(L.s[n1].a[n2])
    b[cnt++] = L.s[n1].a[n2];
}
void solve_3616() {
    int n, m;
    cin >> n >> m;
    Sqg L;
    Lizi(L, n);
    while (m--) {
        int i=0;
        int n1=0, n2=0;
        long long n3=0;
        cin >> i;
        if (i == 1) {
            cin >> n1 >> n2 >> n3;
            add(L, n1, n2, n3);
        }
        if (i == 2) {
            cin >> n1 >> n2;
            Sreach(L, n1, n2);
        }
    }
}
int main() {
    solve_3616();
    for (int j = 0; j < cnt; j++) {
        cout << b[j] << endl;
    }
    return 0;
}