Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:17:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[nod].size(); i++){ ^ user.cpp: In function ‘void dfs2(int, int)’: user.cpp:37:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < v[nod].size(); i++){ ^ user.cpp: In function ‘int main()’: user.cpp:55:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] ff[ mc[i].f ] = ff[ mc[i].s ] = 1; ^ user.cpp:55:37: warning: array subscript has type ‘char’ [-Wchar-subscripts] ff[ mc[i].f ] = ff[ mc[i].s ] = 1; ^ user.cpp:73:31: warning: array subscript has type ‘char’ [-Wchar-subscripts] mc[i].f = ff[ mc[i].f ]; ^ user.cpp:74:31: warning: array subscript has type ‘char’ [-Wchar-subscripts] mc[i].s = ff[ mc[i].s ]; ^ user.cpp:75:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[ mc[i].f ].push_back( mc[i].s); ^ user.cpp:76:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] t[ mc[i].s ] = 1; ^