Compilare: user.cpp: In function ‘int main()’: user.cpp:18:8: warning: variable ‘f’ set but not used [-Wunused-but-set-variable] FILE *f, *g; ^ user.cpp:18:12: warning: variable ‘g’ set but not used [-Wunused-but-set-variable] FILE *f, *g; ^ user.cpp:22:9: warning: unused variable ‘j’ [-Wunused-variable] int i, j, k, n, x, y, d, s; ^ user.cpp:22:12: warning: unused variable ‘k’ [-Wunused-variable] int i, j, k, n, x, y, d, s; ^ user.cpp:24:7: warning: unused variable ‘c’ [-Wunused-variable] char c; ^ user.cpp:26:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &s); ^