Compilare: user.cpp: In function ‘int main()’: user.cpp:10:9: warning: unused variable ‘i’ [-Wunused-variable] int i,j; ^ user.cpp:10:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^ user.cpp:14:35: warning: variable ‘nr’ set but not used [-Wunused-but-set-variable] int p1,p2,nr1,nr2,x1,x2,y1,y2,nr; ^ user.cpp:11:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("taxi.in","r",stdin); ^ user.cpp:12:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("taxi.out","w",stdout); ^