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B. GCD Partition While at Kira's house, Josuke saw a piece of paper on the table with a task written on it. The task sounded as follows. There is an a 阅读全文
摘要：
D. Fixed Prefix Permutations You are given $n$ permutations $a_1, a_2, \dots, a_n$, each of length $m$. Recall that a permutation of length $m$ is a s 阅读全文