Compilare: main.cpp: In function 'void dfs(int)': main.cpp:34:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[nod].size() && ok==0 ;j++) ~^~~~~~~~~~~~~~ main.cpp:41:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[nod].size();j++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:53:14: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(int j=1;j<=n;j++) ^~~ main.cpp:55:16: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' sol[t[i]]++; ^~~