Long Number CodeForces - 1157B

Long Number CodeForces - 1157B ios 题意：英语是硬伤。错了好屡次，多错了题意。能够从数字串的某一个位置开始替换一段字串f(xi)，不能超过一次。输出答案。git You can perform the following operation no more than once: choose a non-empty contiguous subsegment of

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