Compilare: user.cpp: In function ‘bool bellman()’: user.cpp:33:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<list[node].size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:59:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fmcm.in","r",stdin); ^ user.cpp:60:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fmcm.out","w",stdout); ^ user.cpp:62:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld %ld %ld %ld",&n,&m,&s,&d); ^ user.cpp:64:42: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld%ld%ld%ld",&x,&y,&c,&z); ^