View Compilation Error

0_0_33250808_30420.cpp: In function 'void addedge(int, int)':
0_0_33250808_30420.cpp:26:32: error: invalid conversion from '_edge*' to 'int' [-fpermissive]
     edge[edges] = _edge(v, edge);
                                ^
0_0_33250808_30420.cpp:18:5: note: initializing argument 2 of '_edge::_edge(int, int)'
     _edge(int v, int next):v(v), next(next){}
     ^
0_0_33250808_30420.cpp:27:19: error: lvalue required as increment operand
     head[u] = edge++;
                   ^