Eroare de compilare: user.cpp: In function ‘void scan()’: user.cpp:15: error: ‘stdin’ was not declared in this scope user.cpp:15: error: ‘freopen’ was not declared in this scope user.cpp:16: error: ‘stdout’ was not declared in this scope user.cpp:17: error: ‘scanf’ was not declared in this scope user.cpp:22: error: ‘sort’ was not declared in this scope user.cpp: In function ‘void solve()’: user.cpp:30: error: ‘printf’ was not declared in this scope user.cpp:33: error: ‘scanf’ was not declared in this scope user.cpp:39: error: ‘upper_bound’ was not declared in this scope user.cpp:50: error: ‘printf’ was not declared in this scope