View Compilation Error

0_0_36402694_14119.cpp:20:8: error: no matching function for call to 'edge::edge()'
 }e[maxm];
        ^
0_0_36402694_14119.cpp:20:8: note: candidates are:
0_0_36402694_14119.cpp:15:5: note: edge::edge(int, int, int)
     edge(int v,int c,int next){
     ^
0_0_36402694_14119.cpp:15:5: note:   candidate expects 3 arguments, 0 provided
0_0_36402694_14119.cpp:13:8: note: constexpr edge::edge(const edge&)
 struct edge{
        ^
0_0_36402694_14119.cpp:13:8: note:   candidate expects 1 argument, 0 provided
0_0_36402694_14119.cpp:13:8: note: constexpr edge::edge(edge&&)
0_0_36402694_14119.cpp:13:8: note:   candidate expects 1 argument, 0 provided