/in/foo.cc: In function 'int main()':
/in/foo.cc:51:8: warning: 'now' may be used uninitialized in this function [-Wmaybe-uninitialized]
  a[now]=0;g[1][0]=g[1][a[1]]=true;//TianPing-DP 等式的基本性质 
  ~~~~~~^~