Compilare: user.cpp: In function ‘int main()’: user.cpp:59:24: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if( q1.empty() and q2.empty() or ( q1.empty() and q2.size()==1 ) or ( q2.empty() and q1.size()==1 ) ) ^ user.cpp:29:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( OUT , "w" , stdout ); ^