Compilare: user.cpp: In function ‘int main()’: user.cpp:45:15: warning: unused variable ‘a’ [-Wunused-variable] int t, n, a, b, c, k, occup; ^ user.cpp:45:18: warning: unused variable ‘b’ [-Wunused-variable] int t, n, a, b, c, k, occup; ^ user.cpp:45:21: warning: unused variable ‘c’ [-Wunused-variable] int t, n, a, b, c, k, occup; ^ user.cpp:42:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("reg.in", "r", stdin); ^ user.cpp:43:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("reg.out", "w", stdout); ^