/in/foo.cc: In member function 'bool oper::operator<(oper) const':
/in/foo.cc:10:64: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  inline bool operator<(const oper a)const {return c<a.c||c==a.c&&abs(v)<abs(a.v);}
                                                          ~~~~~~^~~~~~~~~~~~~~~~~
/in/foo.cc: In function 'void CDQ(int, int)':
/in/foo.cc:52:9: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int m=l+r>>1,h=0,b=0;
        ~^~