Minimum Number of Increments on Subarrays to Form a Target Array LeetCode solution in Rust

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impl Solution {
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  pub fn min_number_operations(target: Vec<i32>) -> i32 {
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    let mut ans = 0;
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    let mut prev = 0;
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    for &x in target.iter() {
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      if x > prev {
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        ans += x - prev;
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      }
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      prev = x;
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    }
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    ans
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  }
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}