Compilare: user.cpp: In function ‘bool test(int)’: user.cpp:25:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<a[B].size(); i++) s+=1-m[a[B][i]]; ^ user.cpp: In function ‘void bfs(int)’: user.cpp:43:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<a[B].size(); i++) ^