leetcode 4 Median of Two Sorted Arrays

solution:
 1 class Solution {
 2 public:
 3     double findMedianSortedArrays(vector<int>& nums1, vector<int>& nums2) {
 4         int mid = nums1.size() + nums2.size() ;
 5         int is_even = mid % 2;
 6         mid = mid / 2 + 1;
 7         double tmp = 0;
 8         int cur_1 = 0;
 9         int cur_2 = 0;
10         for(int i = 0 ;i<mid;i++){
11             int a = 0;
12             if (cur_1 == nums1.size()){                
13                 a = nums2[cur_2];
14                 cur_2 ++;
15             }else if (cur_2 == nums2.size()){
16                 a = nums1[cur_1];
17                 cur_1 ++;
18             }else{
19                 if (nums1[cur_1] < nums2[cur_2]){
20                     a = nums1[cur_1];
21                     cur_1 ++;
22                 }else{
23                     a = nums2[cur_2];
24                     cur_2 ++;
25                 }
26             }
27             if (is_even == 0 && i == mid - 2){
28                 tmp += a;
29             }else if (i == mid - 1){
30                 tmp += a;
31             }
32         }
33         if (is_even == 0){
34             tmp = tmp / 2;
35         }
36         return tmp;
37     }
38 };