记忆化
by Siyuan @ 2017-12-23 20:28:53
记忆化+1
for example if(ans[x]!=0)return ans[x];
by JYTS @ 2018-01-16 17:11:07
递推最快
by qwqKanade @ 2018-01-25 15:32:37
记忆话搜索+3
by magical @ 2018-06-09 19:12:44