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the ruleLet's observe the rule below: 1 1 1 1 2 1 1 2 2 1 1 2 3 2 1 1 2 3 3 2 1 1 2 3 4 3 2 1 1 2 3 4 4 3 2 1 ..... Now you guess the method: First create interval as index, then use binary search(or sequence search) to locate the interval, and then output the result. Followed by:
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