Compilare: user.cpp: In function ‘int main()’: user.cpp:10:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("distanta.in","r",stdin); ^ user.cpp:11:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("distanta.out","w",stdout); ^ user.cpp:13:32: warning: ‘d2’ may be used uninitialized in this function [-Wmaybe-uninitialized] long long a,b,xi,yi,x,y,d1,d2,r; ^ user.cpp:27:18: warning: ‘d1’ may be used uninitialized in this function [-Wmaybe-uninitialized] r-=int(r); ^