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- #include <iostream>
- #include <vector>
- using namespace std;
- int main(){
- int n, q;
- cin >> n >> q;
- vector< vector<int> > a(n);
- for(int i=0; i<n; i++){
- int k;
- cin >> k;
- for(int j=0; j<k; j++){
- int tmp;
- cin >> tmp;
- a[i].push_back(tmp);
- }
- }
- for(int i=0; i<q; i++){
- int c, d;
- cin >> c >> d;
- cout<<a[c][d]<<endl;
- }
- }
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