摘要: D. Token Removing Define a sequence of integers $a$ valid if and only if $\forall 1 \le i \le n, 0 \le a_i \le i$. Define the weight $f(a)$ of a valid 阅读全文
posted @ 2025-07-12 12:13 onlyblues 阅读(37) 评论(0) 推荐(0)
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