双阶乘2
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Description
一个正整数的双阶乘,表示不超过这个正整数且与它有相同奇偶性的所有正整数的乘积。n的双阶乘用n!!表示。例如:
3!! = 3 * 1= 3
8!! = 8 * 6 * 4 * 2 = 384
请问,截取自13147799!!的倒数(也就是从低位往高位数)第3位到倒数第8位的(十进制)数是多少?
例如:截取数字745201314的倒数第3位到倒数第8位:745201314,得到452013
Format
Input
无
Output
直接输出你的答案以验证结果
Samples Out
xxxxxx
篮桥杯填空题训练
- Status
- Done
- Rule
- XCPC
- Problem
- 10
- Start at
- 2024-10-19 22:00
- End at
- 2024-10-25 0:00
- Duration
- 122 hour(s)
- Host
- Partic.
- 27