Compilare: user.cpp: In function ‘bool BF()’: user.cpp:40:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long i=0;i<list[node].size();i++){ ^ user.cpp:50:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long i=0;i<list[d].size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:73:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("drumuri2.in","r",stdin); ^ user.cpp:74:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("drumuri2.out","w",stdout); ^ user.cpp:76:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld %ld",&n,&m); ^ user.cpp:83:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld %ld",&x,&y); ^