Compilare: main.cpp: In function 'void Useless()': main.cpp:48:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < Ad[nod].size(); ++i ) { ~~^~~~~~~~~~~~~~~~ main.cpp:53:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = 0; j < Ad[vecin].size(); ++j ) ~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'void Dfs(int, int)': main.cpp:72:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < Ad[nod].size(); ++i ) { ~~^~~~~~~~~~~~~~~~ main.cpp:71:9: warning: unused variable 'w' [-Wunused-variable] int w; ^ main.cpp: In function 'int FindDiameter()': main.cpp:97:19: warning: 'nmax' may be used uninitialized in this function [-Wmaybe-uninitialized] Dfs( nmax, 1 ); ^