Eroare de compilare: user.cpp: In function ‘void init()’: user.cpp:29: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘bool rec(int, int, const std::vector<int, std::allocator<int> >&, int)’: user.cpp:49: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main(int, const char**)’: user.cpp:64: error: ‘sort’ was not declared in this scope user.cpp: In function ‘void read(std::vector<T, std::allocator<_CharT> >&) [with T = int]’: user.cpp:63: instantiated from here user.cpp:35: warning: comparison between signed and unsigned integer expressions