1
var totalHammingDistance = function (nums) {
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  let n = nums.length,
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    ans = 0;
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  for (let bit = 0; bit < 32; bit++) {
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    let zeros = 0,
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      ones = 0;
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    for (let i = 0; i < n; i++) {
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      (nums[i] >> bit) & 1 ? ones++ : zeros++;
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    }
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    ans += zeros * ones;
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  }
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  return ans;
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};