Compilare: user.cpp: In function ‘int main()’: user.cpp:15:38: warning: format ‘%lf’ expects argument of type ‘double*’, but argument 2 has type ‘int*’ [-Wformat=] scanf("%lf %lf", &x[i], &y[i]); ^ user.cpp:15:38: warning: format ‘%lf’ expects argument of type ‘double*’, but argument 3 has type ‘int*’ [-Wformat=] user.cpp:6:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("aria.in", "r", stdin); ^ user.cpp:7:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("aria.out", "w", stdout); ^ user.cpp:11:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ user.cpp:15:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf %lf", &x[i], &y[i]); ^