题目描述:
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]
思路:从长数组那边倒序输出,就可以不用额外空间,实现两个数组的合并。
实现:
class Solution {
public void merge(int[] nums1, int m, int[] nums2, int n) {
int k=m+n-1;
int i=m-1;
int j=n-1;
while(k>=0){
if(i<0){
nums1[k--]=nums2[j--];
continue;
}
if(j<0){
break;
}
if(nums1[i]>nums2[j]){
nums1[k--]=nums1[i--];
}else{
nums1[k--]=nums2[j--];
}
}
}
}