Compilare: user.cpp: In function ‘int main()’: user.cpp:12:15: warning: unused variable ‘r’ [-Wunused-variable] int n, m, r, x, y, Ans = 0; ^ user.cpp:12:18: warning: unused variable ‘x’ [-Wunused-variable] int n, m, r, x, y, Ans = 0; ^ user.cpp:12:21: warning: unused variable ‘y’ [-Wunused-variable] int n, m, r, x, y, Ans = 0; ^ user.cpp:13:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("grendizer.in","r",stdin); ^ user.cpp:14:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("grendizer.out","w",stdout); ^ user.cpp:15:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:18:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^ user.cpp:26:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&x, &y, &r); ^