球条+求哈克

P5002 专心OI - 找祖先

@[Steve_xh](/user/639198) ```txt 2 1 1 1 2 1 ``` Ans: `3`
by cjrawa @ 2023-12-07 13:46:36


@[cjrawa](/user/523641) thx
by Steve_xh @ 2023-12-08 15:32:50


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