腾讯//合并两个有序数组

 

给定两个有序整数数组 nums1 和 nums2,将 nums2 合并到 nums1 使得 num1 成为一个有序数组。

说明:

  • 初始化 nums1 和 nums2 的元素数量分别为 m 和 n
  • 你可以假设 nums1 有足够的空间(空间大小大于或等于 m + n)来保存 nums2 中的元素。

示例:

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

输出: [1,2,2,3,5,6]
class Solution {
public:
    void merge(vector<int>& nums1, int m, vector<int>& nums2, int n) {
        int num[m+n];
        int i=0, j=0, k=0;
        while(i<m&&j<n){
            if(nums1[i]<=nums2[j])
                num[k++] = nums1[i++];
            else
                num[k++] = nums2[j++];
        }
        while(i<m) num[k++] = nums1[i++];
        while(j<n) num[k++] = nums2[j++];
        copy(num,num+m+n,nums1.begin());
    }
};
class Solution {
public:
    void merge(vector<int>& nums1, int m, vector<int>& nums2, int n) {
        int num[m+n];//新建一个数组,对nums1和nums2排序,排完序赋值给nums1
        int i = 0,j = 0,k = 0;
        while(i<m && j<n){
            if(nums1[i] <= nums2[j])
                num[k++] = nums1[i++];
            else
                num[k++] = nums2[j++];
        }
        while(i < m) num[k++] = nums1[i++];
        while(j < n) num[k++] = nums2[j++];
        copy(num,num+m+n,nums1.begin());
    }
};
class Solution {
public:
    void merge(vector<int>& nums1, int m, vector<int>& nums2, int n) {
        int k=m+n;
        while(m>0 && n>0){
            if(nums1[m-1] >= nums2[n-1]){
                nums1[k-1] = nums1[m-1];
                --k; 
                --m;
            }
            else{
                nums1[k-1] = nums2[n-1];
                --k;
                --n;
            }
        }
        while(n > 0){
            nums1[k-1] = nums2[n-1];
            --k;
            --n;
        }
    }
};

 

posted @ 2018-10-23 16:49  strawqqhat  阅读(90)  评论(0编辑  收藏  举报
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