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发信人: kaman (天外飞仙), 信区: ACMICPC
标 题: 小题一道
发信站: 荔园晨风BBS站 (Fri Sep 3 10:15:33 2004), 站内信件
看谁做得快而已……
Factorials
The factorial of an integer N, written N!, is the product of all the in
tegers from 1 through N inclusive. The factorial quickly becomes very la
rge: 13! is too large to store in a 32-bit integer on most computers, an
d 70! is too large for most floating-point variables. Your task is to fi
nd the rightmost non-zero digit of n!. For example, 5! = 1 * 2 * 3 * 4 *
5 = 120, so the rightmost non-zero digit of 5! is 2. Likewise, 7! = 1 *
2 * 3 * 4 * 5 * 6 * 7 = 5040, so the rightmost non-zero digit of 7! is
4.
PROGRAM NAME: fact4
INPUT FORMAT
A single positive integer N no larger than 4,220.
SAMPLE INPUT (file fact4.in)
7
OUTPUT FORMAT
A single line containing but a single digit: the right most non-zero di
git of N! .
SAMPLE OUTPUT (file fact4.out)
4
--
灬 灬 灬灬 灬灬 灬 灬 ════════════════════╗╮
╭╯ 灬 灬▂╱ ＿灬灬ジ ヾ 灬╰╗
║ 灬◢◢ "▔ 灬╱ 灵台无计逃神矢 风雨如磐暗故园 ▁ 灬|"|║
║ ◤, |,╱_ ◣◣ 寄意寒星荃不察 我以我血荐轩辕▕心▏ ◣|║
║ _,|\▄/ \▌◥ ▔ヾ◥◥|║
╚═ "\▌| ▔ | | /" ════════════════════════╯
※ 来源:·荔园晨风BBS站 bbs.szu.edu.cn·[FROM: 192.168.111.200]
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