Problem 1001 提个问题

freezeriver | 2016-03-05 19:15:07Author
suff​i​​是第i字符开头的后缀，是否包含si
admin | 2016-03-05 19:22:11# 1
包含
freezeriver | 2016-03-05 19:22:39# 2
谢谢
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