Compilare: user.cpp: In function ‘int main()’: user.cpp:13:15: warning: unused variable ‘la’ [-Wunused-variable] int n, k, la, lb; ^ user.cpp:13:19: warning: unused variable ‘lb’ [-Wunused-variable] int n, k, la, lb; ^ user.cpp:11:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("minusk.in", "r", stdin); ^ user.cpp:12:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("minusk.out", "w", stdout); ^ user.cpp:15:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &k); ^