Compilare: user.cpp: In function ‘int main()’: user.cpp:24:13: warning: unknown escape sequence: '\w' [enabled by default] cout << "Hello \world!" << endl; ^ user.cpp:22:11: warning: unused variable ‘x’ [-Wunused-variable] int n,x,y,k; ^ user.cpp:22:13: warning: unused variable ‘y’ [-Wunused-variable] int n,x,y,k; ^ user.cpp:20:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("cezar.in" , "r", stdin); ^ user.cpp:21:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("cezar.out" , "w", stdout); ^ user.cpp:23:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &k); ^