Compilare: user.cpp: In function ‘int main()’: user.cpp:55:9: warning: unused variable ‘n’ [-Wunused-variable] int k, n, m; ^ user.cpp:55:12: warning: unused variable ‘m’ [-Wunused-variable] int k, n, m; ^ user.cpp:53:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fractal.in", "r", stdin); ^ user.cpp:54:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fractal.out", "w", stdout); ^ user.cpp:56:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &k, &x, &y); ^