摘要: P3131 [USACO16JAN] Subsequences Summing to Sevens S P3131 [USACO16JAN] Subsequences Summing to Sevens S 思路: 一看到区间和我们应该就能马上想到把这个区间拆分成两个前缀相减的形式 式子为:(Pre 阅读全文
posted @ 2025-04-23 21:52 Alaso_shuang 阅读(36) 评论(0) 推荐(0)
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