Compilare: user.cpp: In function ‘void read()’: user.cpp:40:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<Hash[cheie].size() && ok;++i) ^ user.cpp: In function ‘long long int solve_subseq(int)’: user.cpp:80:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<b.size();++i) ^ user.cpp: In function ‘void open_files()’: user.cpp:20:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("secv5.in","r",stdin); ^ user.cpp:21:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("secv5.out","w",stdout); ^ user.cpp: In function ‘void citeste(unsigned int&)’: user.cpp:26:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%u", &numar); ^ user.cpp: In function ‘void read()’: user.cpp:31:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &N, &L, &U); ^