Compilare: main.cpp: In function 'void Dfs(int)': main.cpp:37:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < Ad[nod].size(); ++i ) { ~~^~~~~~~~~~~~~~~~ main.cpp:36:9: warning: unused variable 'w' [-Wunused-variable] int w; ^ main.cpp: In function 'void Do()': main.cpp:46:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < k.size(); ++i ) ~~^~~~~~~~~~