/in/foo.cc: In function 'bool yuudachi(int)':
/in/foo.cc:12:49: warning: operation on 'ind' may be undefined [-Wsequence-point]
     while(ta[ind].first&&ta[ind].second!=num)ind=((++ind)%4000050);
                                              ~~~^~~~~~~~~~~~~~~~~~
/in/foo.cc: In function 'bool insert(int)':
/in/foo.cc:19:49: warning: operation on 'ind' may be undefined [-Wsequence-point]
     while(va[ind].first&&va[ind].second!=num)ind=((++ind)%4000050);
                                              ~~~^~~~~~~~~~~~~~~~~~