Golang | Leetcode Golang题解之第4题寻找两个正序数组的中位数

题目：

题解：

func findMedianSortedArrays(nums1 []int, nums2 []int) float64 {
    if len(nums1) > len(nums2) {
        return findMedianSortedArrays(nums2, nums1)
    }
    m, n := len(nums1), len(nums2)
    left, right := 0, m
    median1, median2 := 0, 0
    for left <= right {
        i := (left + right) / 2
        j := (m + n + 1) / 2 - i
        nums_im1 := math.MinInt32
        if i != 0 {
            nums_im1 = nums1[i-1]
        }
        nums_i := math.MaxInt32
        if i != m {
            nums_i = nums1[i]
        }
        nums_jm1 := math.MinInt32
        if j != 0 {
            nums_jm1 = nums2[j-1]
        }
        nums_j := math.MaxInt32
        if j != n {
            nums_j = nums2[j]
        }
        if nums_im1 <= nums_j {
            median1 = max(nums_im1, nums_jm1)
            median2 = min(nums_i, nums_j)
            left = i + 1
        } else {
            right = i - 1
        }
    }
    if (m + n) % 2 == 0 {
        return float64(median1 + median2) / 2.0
    }
    return  float64(median1)
}

func max(x, y int) int {
    if x > y {
        return x
    }
    return y
}

func min(x, y int) int {
    if x < y {
        return x
    }
    return y
}