/**
* title: 快速排序法
* type array
* @param arr
*/

var quickSort = function(arr) {
  if (arr.length <= 1) { return arr; }
  var pivotIndex = Math.floor(arr.length / 2);
  var pivot = arr.splice(pivotIndex, 1)[0];
  var left = [];
  var right = [];
  for (var i = 0; i < arr.length; i++){
    if (arr[i] < pivot) {
      left.push(arr[i]);
    } else {
      right.push(arr[i]);
    }
  }
  return quickSort(left).concat([pivot], quickSort(right));
};

 

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