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Checking whether an array has an arithmetic sequence ?
By 420yoloswag69, history, 9 years ago, In English

Hi any ways to check whether an array (1e5 items at most) has an arithmetic progression as a subsequence and output their positions?

for example 5

3 4 2 1 5

output 1 3 4

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9 years ago, # |
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Any two numbers form an arithmetic progression.

If you want 3 numbers, it seems like a harder version of 452F - Перестановка.

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