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#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
 
class Graph
{
private:
    vector<vector<pair<int, int>>> matrix;
public:
    Graph() = default;
    Graph(size_t nodes, size_t edges);
    Graph(size_t nodes, size_t edges, istream &is)
        Graph (nodes, edges);
};
 
Graph::Graph (size_t nodes, size_t edges)
{
    matrix.resize (nodes);
    for (auto &v : matrix)
        v.resize (nodes);
}
 
Graph::Graph(size_t nodes, size_t edges, istream &is)
{
 
}
 
int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}

prog.cpp:15:50: error: expected ';' at end of member declaration
     Graph(size_t nodes, size_t edges, istream &is)
                                                  ^
prog.cpp:16:21: error: expected ')' before ',' token
         Graph (nodes, edges);
                     ^

Standard output is empty