stO twx
by Le_temps_des_fleurs @ 2019-07-22 13:10:55
你初始化时$f[i][i-1]$也要初始化为0，否则当$len$=$2$且$s[i]$=$s[j]$时，$f[i+1][j-1]$就是无穷大，而不是$0$
by yzy_rick @ 2021-05-22 09:54:43
%%%感谢巨佬
by RAIH @ 2021-11-03 21:42:45