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这是出给pj的题ccccc 阅读全文
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https://www.luogu.org/problemnew/show/P2346 广搜 阅读全文
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https://www.luogu.org/problemnew/show/P1379 long long ago 暴力bfs 阅读全文
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https://www.luogu.org/problemnew/show/P3870 线段树区间翻转 + 区间查询 阅读全文
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https://www.luogu.org/problemnew/show/P1613 Floyd判断是否一步到达 将一步到达的连变跑Floyd 阅读全文
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https://www.luogu.org/problemnew/show/P1083 二分第i天不满足 前缀和 + 差分判断 阅读全文
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https://www.luogu.org/problemnew/show/P3131 A表示前缀和数组 A[r] - A[l - 1] = 0 (mod 7) 得 A[r] = A[l - 1] (mod 7) 阅读全文
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https://www.luogu.org/problemnew/show/P2420 异或满足 A ^ B = B ^ A A ^ A = 0 0 ^ A = A 阅读全文