LeetCode Median of Two Sorted Arrays

一、题目

There are two sorted arrays nums1 and nums2 of size m and n respectively.

Find the median of the two sorted arrays. The overall run time complexity should be O(log (m+n)).

Example 1:
nums1 = [1, 3]
nums2 = [2]

The median is 2.0
Example 2:
nums1 = [1, 2]
nums2 = [3, 4]

The median is (2 + 3)/2 = 2.5

二、代码

简单合并，排序，取中值

class Solution {
public:
    double findMedianSortedArrays(vector<int>& nums1, vector<int>& nums2) { 
        int *it;
        int m = nums1.size()?nums1.size():0;
        int n = nums2.size()?nums2.size():0;
        int *merge = new int[m+n];

        if(!nums1.empty()){
            it = &*nums1.begin();
            memcpy(merge,it,sizeof(int)*m);   
        }
        if(!nums2.empty()){
            it = &*nums2.begin();
            memcpy(merge+m,it,sizeof(int)*n);  
        }
        sort(merge,merge+m+n);
        //注意数组下标和计算的下标区别
        return (m+n)%2?1.0*merge[(m+n)>>1]:(merge[(m+n-1)>>1]+merge[(m+n)>>1])/2.0;

    }
};