遍历求乘积时为什么不能用区间来判定字符，而是要用字符串长度？

P1200 [USACO1.1] 你的飞碟在这儿 Your Ride Is Here

@[Hasci](/user/394719) 字符串长度没说一定是6啊
by Ninelife_Cat @ 2021-08-03 10:50:20

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@[Ninelife_Cat](/user/329672) 但长度总是小于等于六呀
by Hasci @ 2021-08-03 11:46:41

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@[Hasci](/user/394719)  懂了吗
by きりと @ 2021-08-03 12:08:19

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