Submission #76641686

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;

int main()
{
    int N;
    cin >> N;
    
    vector<vector<int>> v(N+1);
    
    for(int i = 1; i < N+1; i++){
        
        int k;
        cin >> k;
        
        for(int j = 0; j < k; j++){
        
            int a;
            cin >> a;
            
            v[a].push_back(i);
        }
    }
    
    for(int i = 1; i < N+1; i++){
        
        cout << v[i].size() <<" ";
        
        for(int j = 0; j < v[i].size(); j++){
        
            cout << v[i][j] << " ";
        }
        
        cout << endl;
    }
    
    
    
    
    
    
    
    return 0;
}

Submission Info

Compile Error

./Main.cpp: In function 'int main()':
./Main.cpp:29:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |         for(int j = 0; j < v[i].size(); j++){
      |                        ~~^~~~~~~~~~~~~

Judge Result