Compilare: user.cpp: In function ‘void addedge(int, int, int)’: user.cpp:38:36: warning: narrowing conversion of ‘g[to].std::vector<_Tp, _Alloc>::size<Edge, std::allocator<Edge> >()’ from ‘std::vector<Edge>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] Edge direct = {to, g[to].size(), 0, col, 0}; ^ user.cpp:39:38: warning: narrowing conversion of ‘g[from].std::vector<_Tp, _Alloc>::size<Edge, std::allocator<Edge> >()’ from ‘std::vector<Edge>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] Edge inverse = {from, g[from].size(), 0, col, 0}; ^ user.cpp: In function ‘void solve(int)’: user.cpp:59:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[from].size(); i++){ ^ user.cpp:79:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[from].size(); i++){ ^ user.cpp:48:8: warning: unused variable ‘incycle’ [-Wunused-variable] bool incycle = false; ^ user.cpp: In function ‘void write()’: user.cpp:98:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < output.size(); i++){ ^ user.cpp: In function ‘int main()’: user.cpp:116:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j + plus < g[i].size(); j++){ ^