/**
 * @param {number[][]} intervals
 * @return {number}
 */
const minMeetingRooms = function (intervals) {
  const len = intervals.length;
  const starts = new Array(len);
  const ends = new Array(len);
  for (let i = 0; i < len; i++) {
    starts[i] = intervals[i][0];
    ends[i] = intervals[i][1];
  }
  starts.sort((a, b) => a - b);
  ends.sort((a, b) => a - b);
  let rooms = 0;
  let endsIdx = 0;
  for (let i = 0; i < len; i++) {
    if (starts[i] < ends[endsIdx]) rooms++;
    else endsIdx++;
  }
  return rooms;
};