排序相关 过滤

1，冒泡排序

//按照从大到小的样式排序

class  func getArrForMaxAndMin(changeArr: [Int]) -> [Int]{

var arr = changeArr

if changeArr.count > 1 {

for i in 0 ..< arr.count - 1 {

for j in 0 ..< arr.count - i - 1 {

if arr[j] < arr[j+1] {

let  temp = arr[j]

arr[j] = arr[j+1]

arr[j+1] = temp

}

}

}

}

return arr

}