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B. Yaroslav and Two Strings Yaroslav thinks that two strings s and w, consisting of digits and having length n are non-comparable if there are two numbers, i and j (1 ≤ i, j ≤ n), such

Problem Description Senior Pan had just failed in his math exam, and he can only prepare to make up for it. So he began a daily task with Master Dong, Dong will give a simple math problem to poor