这题为什么我全是re？

#include<iostream>
const long long MAXSIZE=1e+9;
const long long  MAX=1E+5;
using namespace std;
typedef struct BOX{
    long long things[MAXSIZE];
}box;

int main(void){
    int num;
    long long count;
    cin>>num>>count;
    box Box[MAX]={0};
    int flag,a;
    long long b;
    for(int i=1;i<=count;i++){
        cin>>flag>>a>>b;
        if(flag==1){
            long long tmp;
            cin>>tmp;
            if(tmp==0)
                Box[a].things[b]=0;
            else 
                Box[a].things[b]=tmp;
        }
        else if(flag==2){
            cout<<Box[a].things[b]<<endl;
        }
    }
    return 0;
}