Compilare: user.cpp: In function ‘long long int ConvertToLL(std::string)’: user.cpp:20:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Str.length(); ++ i) ^ user.cpp: In function ‘std::string ConvertToString(long long int)’: user.cpp:39:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < D.size() - 14; ++ i) ^ user.cpp:45:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = D.size() - 14; i < D.size() - 14 + 10; ++ i) ^ user.cpp: In function ‘int GetInt()’: user.cpp:59:48: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(Buf, 1, MaxB, stdin), Ptr = 0; ^ user.cpp:64:48: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(Buf, 1, MaxB, stdin), Ptr = 0; ^ user.cpp: In function ‘std::string GetString()’: user.cpp:74:48: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(Buf, 1, MaxB, stdin), Ptr = 0; ^ user.cpp:86:48: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(Buf, 1, MaxB, stdin), Ptr = 0; ^ user.cpp: In function ‘int main()’: user.cpp:93:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dstar.in", "r", stdin); ^ user.cpp:95:31: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(Buf, 1, MaxB, stdin); ^