Compilare: user.cpp: In function ‘void bfs(int)’: user.cpp:23:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[x].size();i++) ^ user.cpp: In function ‘void bfs2(int)’: user.cpp:49:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[x].size();i++) ^ user.cpp: In function ‘void read()’: user.cpp:83:14: warning: unused variable ‘bule’ [-Wunused-variable] bool bule=0; ^ user.cpp:67:15: warning: unused variable ‘j’ [-Wunused-variable] int i,a,b,j; ^ user.cpp:68:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("amici2.in","r",stdin); ^ user.cpp:69:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("amici2.out","w",stdout); ^ user.cpp:70:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&T); ^ user.cpp:74:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:78:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&a,&b); ^