LeetCode--088--合并两个有序数组

方法1：

class Solution(object):
    def merge(self, nums1, m, nums2, n):
        """
        :type nums1: List[int]
        :type m: int
        :type nums2: List[int]
        :type n: int
        :rtype: void Do not return anything, modify nums1 in-place instead.
        """
        while m>0 and n >0:
            if nums1[m-1] >= nums2[n-1]:
                nums1[m+n-1] = nums1[m-1]
                m -= 1
            else:
                nums1[m+n-1] = nums2[n-1]
                n -= 1
        if n > 0:
            nums1[:n] = nums2[:n]

同上:

class Solution:
    def merge(self, nums1, m, nums2, n):
        """
        :type nums1: List[int]
        :type m: int
        :type nums2: List[int]
        :type n: int
        :rtype: void Do not return anything, modify nums1 in-place instead.
        """
        end = m + n -1
        m -= 1
        n -= 1
        while end >= 0 and m >= 0 and n >= 0:
            if nums1[m] > nums2[n]:
                nums1[end] = nums1[m]
                m -= 1
            else:
                nums1[end] = nums2[n]
                n -= 1
            end -= 1
        while n >= 0:
            nums1[end] = nums2[n]
            n -= 1
            end -= 1

方法3：

class Solution(object):
    def merge(self, nums1, m, nums2, n):
        """
        :type nums1: List[int]
        :type m: int
        :type nums2: List[int]
        :type n: int
        :rtype: void Do not return anything, modify nums1 in-place instead.
        """
        nums1[m: m + n] = nums2[: n]
        nums1.sort()