Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:46: error: ‘fopen’ was not declared in this scope user.cpp:48: error: ‘fscanf’ was not declared in this scope user.cpp:57: error: ‘sort’ was not declared in this scope user.cpp:59: error: ‘memset’ was not declared in this scope user.cpp:65: error: ‘lower_bound’ was not declared in this scope user.cpp:73: error: ‘fprintf’ was not declared in this scope user.cpp:74: error: ‘fclose’ was not declared in this scope user.cpp:47: warning: unused variable ‘j’ user.cpp:47: warning: unused variable ‘p’ user.cpp:47: warning: unused variable ‘q’ user.cpp:47: warning: unused variable ‘c’