当 cc == 0 时是清空操作，你少了程序
by love_ovo @ 2024-01-31 23:33:03
栓Q，AC了
by shenyeting @ 2024-02-01 11:10:06
发一种其他思路看看
```cpp
#include<bits/stdc++.h>
using namespace std;
int main(){
int n,m;
cin>>n>>m;
vector< vector<int> > l(n+1);
int tmp;
while(m--){
int i,j,k;
cin>>tmp;
if(tmp==1){
cin>>i>>j>>k;
if(l[i].size()<j+1){
l[i].resize(j+1);
}
l[i][j]=k;
}
else{
cin>>i>>j;
cout<<l[i][j]<<endl;
}
}
return 0;
}
```
by kds2012 @ 2024-03-10 08:41:26