Compilare: main.cpp: In function 'void dfs(int)': main.cpp:16:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[nod].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:36:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation] if(!viz[i]) ^~ main.cpp:38:13: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if' ans++; ^~~