Compilare: user.cpp: In function ‘int main()’: user.cpp:14:24: warning: variable ‘x3’ set but not used [-Wunused-but-set-variable] double a, d2, x2, y2, x3, y3, h; ^ user.cpp:14:28: warning: variable ‘y3’ set but not used [-Wunused-but-set-variable] double a, d2, x2, y2, x3, y3, h; ^ user.cpp:10:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cerc.in","r",stdin); ^ user.cpp:11:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cerc.out","w",stdout); ^ user.cpp:12:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:15:61: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (i=1; i<=n; i++) scanf("%d %d %d", &x[i], &y[i], &r[i]); ^