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leetCode-Merge Sorted Array

number int ret script tty style elements scrip clas

Description:
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.

Solution:

//初始化三個指針,i指向A含有元素的尾部,j指向B的尾部,k指向A存放元素的尾部
//對A和B逆序遍歷,從兩個數組中找出最大元素存放一次放到k指向的位置
//最後看看B有沒有放完(不用管A,因為如果i>=0說明剩余元素就該放在原位置上,如果i<0,說明j沒有放完,還得繼續遍歷B)
class Solution {
   public void merge(int A[], int m, int B[], int n) {
    int i=m-1, j=n-1, k=m+n-1;
    while (i>-1 && j>-1) A[k--]= (A[i]>B[j]) ? A[i--] : B[j--];
    
while (j>-1) A[k--]=B[j--]; } }

 

leetCode-Merge Sorted Array