2195 问题 A: 被3整除的子序列
时间限制: 1s
内存限制: 128MB 提交: 146 解决: 64
题目描述
给你一个长度为50的数字串,问你有多少个子序列构成的数字可以被3整除
答案对1e9+7取模
输入
输入一个字符串,由数字构成,长度小于等于50
提示
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