Card Flipping Game LeetCode solution in Rust

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impl Solution {
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  pub fn flipgame(fronts: Vec<i32>, backs: Vec<i32>) -> i32 {
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    let mut nums = [0; 2000];
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    for (f, b) in fronts.into_iter().zip(backs) {
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      if f == b {
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        nums[f as usize - 1] |= 2;
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      } else {
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        nums[f as usize - 1] |= 1;
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        nums[b as usize - 1] |= 1;
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      }
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    }
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    nums
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      .into_iter()
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      .position(|&x| x == 1)
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      .map_or(0, |i| i as i32 + 1)
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  }
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}