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Difficulty: Easy

Given two sorted integer arrays nums1 and nums2, merge nums2 into nums1 as one sorted array.

Note:

  • The number of elements initialized in nums1 and nums2 are m and n respectively.
  • You may assume that nums1 has enough space (size that is greater or equal to m + n) to hold additional elements from nums2.

Example:

Input:
nums1 = [1,2,3,0,0,0], m = 3
nums2 = [2,5,6],       n = 3

Output: [1,2,2,3,5,6]

Solution

Language: Java

class Solution {
    // public void merge(int[] nums1, int m, int[] nums2, int n) {
    //     for (int i = m; i < m + n; i++) {
    //         nums1[i] = nums2[i - m];
    //     }
    //     Arrays.sort(nums1);
    // }
​
    public void merge(int[] nums1, int m, int[] nums2, int n) {
        int x = m - 1;
        int y = n - 1;
        int i = m + n - 1;
        while (x > -1 && y > -1) {
            nums1[i--] = nums1[x] > nums2[y] ? nums1[x--] : nums2[y--];
        }
        while (y > -1) {
            nums1[i--] = nums2[y--];
        }
    }
}

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