Compilare: user.cpp: In function ‘bool isGood(long int, long long int)’: user.cpp:43:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long i=0;i<H[sour].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:56:14: warning: unused variable ‘dest’ [-Wunused-variable] long dest = (1LL*x)%mod; ^ user.cpp:65:14: warning: unused variable ‘dest’ [-Wunused-variable] long dest = (1LL*x) % mod; ^ user.cpp: In function ‘long long int getLong()’: user.cpp:28:39: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(Buff,1,maxBuf,stdin); ^ user.cpp:36:39: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(Buff,1,maxBuf,stdin); ^ user.cpp: In function ‘int main()’: user.cpp:50:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dtcsu.in","r",stdin); ^ user.cpp:51:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dtcsu.out","w",stdout); ^ user.cpp:52:31: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(Buff,1,maxBuf,stdin); ^