Compilare: main.cpp: In function 'void Read()': main.cpp:37:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = 0; j < s.size(); ++j ) ~~^~~~~~~~~~ main.cpp: In function 'void Dfs(int, int)': main.cpp:77:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < Ad[nod].size(); ++i ) { ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'void Do()': main.cpp:147:13: warning: unused variable 'ans' [-Wunused-variable] int ans; ^~~