Median of two sorted array

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

class Solution {
public:
    double findMedianSortedArrays(vector& nums1, vector& nums2) {
        vector temp;
        int len1=nums1.size();
        int len2= nums2.size();
        int idx = (len1+len2)/2+1;//需要存放idx个数
        int i =0,j=0;
        int size = 0;
        if(len1 ==0 && len2==0) return 0.0;
        while(size != idx) //当idx==size的时候退出
        {
            if(i == len1 && j