How Many Numbers Are Smaller Than the Current Number LeetCode solution in Rust

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impl Solution {
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  pub fn smaller_numbers_than_current(nums: Vec<i32>) -> Vec<i32> {
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    nums
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      .iter()
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      .map(|i| nums.iter().filter(|j| *j < &i).count() as i32)
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      .collect()
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  }
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}