Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:51:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[node].size(); i++) ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:96:13: warning: this 'if' clause does not guard... [-Wmisleading-indentation] if(!st.empty() && st.top() == V[i].idx); ^~ main.cpp:97:17: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if' st.pop(); ^~