Compilare: user.cpp: In function ‘int main()’: user.cpp:73:21: warning: unused variable ‘px’ [-Wunused-variable] int x, y, l, p, px, py; ^ user.cpp:73:25: warning: unused variable ‘py’ [-Wunused-variable] int x, y, l, p, px, py; ^ user.cpp:74:9: warning: unused variable ‘pos’ [-Wunused-variable] int pos; ^ 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); ^