Compilare: user.cpp: In function ‘int main()’: user.cpp:70:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] { freopen("zona.in", "r", stdin); ^ user.cpp:71:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zona.out", "w", stdout); ^ user.cpp:95:23: warning: ‘py’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(v[i].x==px && v[i].y==py) ^ user.cpp:95:9: warning: ‘px’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(v[i].x==px && v[i].y==py) ^