Compilare: main.cpp: In function 'int main()': main.cpp:19:43: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("adapost2.in", "r", stdin); ^ main.cpp:20:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ main.cpp:24:39: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lf %lf", X+i, Y+i); ^ main.cpp:52:45: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("adapost2.out", "w", stdout); ^ main.cpp:33:22: warning: 'd' may be used uninitialized in this function [-Wmaybe-uninitialized] while (fabs(d-D) > eps) ~^~