编辑代码

func minMax(array: [Int]) -> (min: Int, max: Int){
  var currentMin = array[0]
  var currentMax = array[0]
  for value in array[1..<array.count]{
    if value < currentMin {
      currentMin = value
    } else if value > currentMax {
      currentMax = value
    }
  }
  return (currentMin, currentMax)
}
//函数返回值方法
if d.isEmpty{
  return String
}
//是否为空集
var arrayNumbers = [Int](students.keys)
arrayNumbers.shuffle()
print(arrayNumbers)
for i in arrayNumbers{
  if let temp = students[i]{
  print(i,temp)
  }
}
//打乱顺序对应