Final Prices With a Special Discount in a Shop LeetCode solution in Rust

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impl Solution {
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  pub fn final_prices(prices: Vec<i32>) -> Vec<i32> {
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    let mut res = Vec::with_capacity(prices.len());
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    'main: for (i, &ai) in prices.iter().enumerate() {
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      for &aj in prices.iter().skip(i + 1) {
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        if aj <= ai {
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          res.push(ai - aj);
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          continue 'main;
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        }
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      }
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      res.push(ai);
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    }
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    res
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  }
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}