Compilare: user.cpp: In function ‘void test(int)’: user.cpp:25:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<a[A].size(); i++) ^ user.cpp:36:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<a[B].size(); j++) s+=1-m[a[B][j]]; ^ user.cpp:28:11: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(m[B]) ^ user.cpp: In function ‘void bfs(int)’: user.cpp:55:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<a[nod].size(); i++) ^