Compilare: user.cpp: In function ‘int Hash(std::vector<int, std::allocator<int> >&)’: user.cpp:21: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int Find(std::vector<int, std::allocator<int> >&)’: user.cpp:31: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void Read()’: user.cpp:63: warning: comparison between signed and unsigned integer expressions user.cpp:71: warning: comparison between signed and unsigned integer expressions user.cpp:53: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:54: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:56: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:61: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void Print()’: user.cpp:97: warning: comparison between signed and unsigned integer expressions user.cpp:99: warning: comparison between signed and unsigned integer expressions user.cpp:89: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result