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admin 11月 12, 2020 0

LeetCode 88 Merge Sorted Array 题解

1.题目：

Given two sorted integer arrays nums1 and nums2, merge nums2 into nums1 as one sorted array.
Note:
You may assume that nums1 has enough space (size that is greater or equal to m + n) to hold additional elements from nums2. The number of elements initialized in nums1 and nums2 are m and n respectively.
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题意：

输入两个有序数组，将他们合并排序

2.解题思路:

插入排序.

3.代码

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public class  {
    public void merge(int[] nums1, int m, int[] nums2, int n) {
       if (n == 0)
			return;
		if (m == 0) {
			for (int i = 0; i < n; i++) {
				nums1[i] = nums2[i];
			}

			return;
		}
		int[] nums3 = new int[m + n];

		int a = 0;
		int b = 0;
		for (int i = 0; i < n + m; i++) {

			if (nums1[a] < nums2[b]) {
				if (a <= m - 1) {
					nums3[i] = nums1[a];
					a++;
				}

				if (a > m - 1) {
					while (b < n) {
						nums3[++i] = nums2[b];
						
						b++;

					}
					break;
				}
			} else {
				if (b <= n - 1) {
					nums3[i] = nums2[b];
					b++;
				}

				if (b > n - 1) {
					while (a < m) {
						nums3[++i] = nums1[a];
						
						a++;

					}
					break;
				}
			}

		}
		for (int i = 0; i < m + n; i++) {
			nums1[i] = nums3[i];
		}
    }
}

4.一些总结：