4.寻找两个正序数组的中位数

func findMedianSortedArrays(nums1 []int, nums2 []int) float64 {
    nums := mergeArr(nums1, nums2)
    println(nums)
    nums = ascArr(nums)
    var rlt float64
    x := len(nums)
    if x%2 == 1 {
        rlt = float64(nums[x/2])
    } else {
        rlt = (float64( nums[x/2] ) + float64( nums[x/2-1] )  ) / 2
    }
    return rlt
}
//　合并数组
func mergeArr(a, b []int) []int {
    var arr []int
    for _, i := range a {
        arr = append(arr, i)
    }
    for _, j := range b {
        arr = append(arr, j)
    }
    return arr
}
// 升序
func ascArr(e []int) []int {
    sort.Ints(e[:])
    return e
}