Compilare: main.cpp: In function 'void Hier(int)': main.cpp:123:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < Ad[nod].size(); ++i ) ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'void T2()': main.cpp:149:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < S.size(); ++i ) ~~^~~~~~~~~~ main.cpp: In function 'void T1()': main.cpp:101:32: warning: 'yv' may be used uninitialized in this function [-Wmaybe-uninitialized] fout << xv << ' ' << yv << ' ' << m[xv][yv]-1 << '\n'; ^~~ main.cpp:101:47: warning: 'xv' may be used uninitialized in this function [-Wmaybe-uninitialized] fout << xv << ' ' << yv << ' ' << m[xv][yv]-1 << '\n'; ~~~~~~~~^