Eroare de compilare: user.cpp:1:19: error: cstdio.h: No such file or directory user.cpp: In function ‘int main()’: user.cpp:9: error: ‘stdin’ was not declared in this scope user.cpp:9: error: ‘freopen’ was not declared in this scope user.cpp:10: error: ‘stdout’ was not declared in this scope user.cpp:11: error: ‘scanf’ was not declared in this scope user.cpp:64: error: ‘printf’ was not declared in this scope user.cpp:7: warning: unused variable ‘a1’