/in/foo.cc: In function 'int main()':
/in/foo.cc:36:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    while(minq.size()>len/2+1)//大于len/2+1个数放入大根堆 
          ~~~~~~~~~~~^~~~~~~~
/in/foo.cc:43:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    while(maxq.size()>len/2)//大于len/2个数放入小根堆 
          ~~~~~~~~~~~^~~~~~