Compilare: user.cpp: In function ‘void bf()’: user.cpp:23:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<=a[x.v].size()-1;i++) ^ user.cpp: In function ‘void go()’: user.cpp:45:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<=a[x.v].size()-1&&ok;i++) ^ user.cpp:38:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,dr;bool ok=1; ^