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:20:20: warning: ‘y’ may be used uninitialized in this function [-Wmaybe-uninitialized] d2=abs(yi-y); ^ user.cpp:18:20: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] d1=abs(xi-x); ^