Compilare: main.cpp: In function 'void dfs(int, int*, bool*)': main.cpp:14:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<graph[nod].size();++i) ~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:50:13: warning: this 'else' clause does not guard... [-Wmisleading-indentation] else ^~~~ main.cpp:74:17: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'else' g<<ok<<'\n'; ^