Find Lucky Integer in an Array LeetCode solution in Rust

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use std::collections::HashMap;
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impl Solution {
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  pub fn find_lucky(arr: Vec<i32>) -> i32 {
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    let mut hm = HashMap::new();
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    for i in arr {
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      *hm.entry(i).or_insert(0) += 1;
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    }
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    let mut max = -1;
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    for (key, value) in hm {
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      if key == value && key > max {
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        max = key;
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      }
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    }
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    max
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  }
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}