Global and Local Inversions LeetCode solution in Rust

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impl Solution {
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  pub fn is_ideal_permutation(nums: Vec<i32>) -> bool {
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    fn _is_ideal_permutation(nums: Vec<i32>) -> Option<bool> {
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      let mut max = 0;
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      for i in 0..nums.len().checked_sub(2)? {
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        max = std::cmp::max(max, *nums.get(i)?);
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        if max > *nums.get(i + 2)? {
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          return Some(false);
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        }
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      }
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      Some(true)
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    }
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    _is_ideal_permutation(nums).unwrap_or(true)
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  }
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}