1
var numPairsDivisibleBy60 = function (time) {
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  let num = 0;
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  let arr = new Array(60).fill(0);
4

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  for (let i of time) {
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    let k = i % 60;
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    if (k === 0) num += arr[k];
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    else num += arr[60 - k];
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    arr[k]++;
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  }
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  return num;
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};