1
var removeCoveredIntervals = function (intervals) {
2
  intervals.sort((a, b) => (a[0] == b[0] ? b[1] - a[1] : a[0] - b[0]));
3
  let count = 0,
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    cur = 0;
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  for (let interval of intervals) {
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    if (cur < interval[1]) {
7
      cur = interval[1];
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      count++;
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    }
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  }
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  return count;
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};