Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:13: error: ‘sum’ was not declared in this scope user.cpp:14: error: expected ‘;’ before ‘for’ user.cpp:14: warning: statement has no effect user.cpp:14: error: expected ‘;’ before ‘)’ token user.cpp:21: error: ‘best’ was not declared in this scope user.cpp:30: error: ‘system’ was not declared in this scope user.cpp:31: error: expected ‘;’ before ‘return’ user.cpp:5: warning: unused variable ‘j’