你在说what
by SSerxhs @ 2020-03-31 15:37:01
@[SSerxhs](/user/29826) 额，就是说……n个拿五十块钱的和n个拿一百元钱的通过卡特兰数算法后没有考虑到这两个n各有n！中排列方式
by cjhspeed @ 2020-03-31 15:43:31
@[cjhspeed](/user/238784) 似乎确实如此@[chen_zhe](/user/8457)
by SSerxhs @ 2020-03-31 15:50:02
@[SSerxhs](/user/29826) 就拿样例来讲：
A.50
B.50
C.100
D.100
有ABCD,ABDC,BACD,BADC,ACBD,ADBC,BCAD，BDAC
by cjhspeed @ 2020-03-31 15:56:10