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Sol2563

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Struct Sol2563 

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pub(crate) struct Sol2563;
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2563m Count the Number of Fair Pairs

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impl Sol2563

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pub fn count_fair_pairs(nums: Vec<i32>, lower: i32, upper: i32) -> i64

1 <= N <= 10^5 -10^9 <= N_i, lower, upper <= 10^9

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