leetcode 4. Median of Two Sorted Arrays

https://leetcode.com/problems/median-of-two-sorted-arrays/

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

第一种思路：采用最暴力的方法，因为给的两个数组都已经排序了，也知道中位数是第几个，直接采用二分归并排序到中位数。

 class Solution {

 public:

     double findMedianSortedArrays(vector<int>& nums1, vector<int>& nums2) {

         vector<int> nums3;

         int i=,j=,k=;

         int m =(nums1.size()+nums2.size());

         while(i<nums1.size()&&j<nums2.size()) {

             if(nums1[i]<nums2[j])

                   nums3.push_back(nums1[i++]);

             else

                 nums3.push_back(nums2[j++]);

             k++;

             if(k>m/)

               {

                   if(m%)

                   return nums3[k-];

                   else

                   return (nums3[k-]+nums3[k-])/2.0;

               }

             }

         while(i<nums1.size()){

             nums3.push_back(nums1[i++]);

             k++;

              if(k>m/)

               {

                   if(m%)

                   return nums3[k-];

                   else

                   return (nums3[k-]+nums3[k-])/2.0;

               }

             }

              while(j<nums2.size()){

             nums3.push_back(nums2[j++]);

             k++;

              if(k>m/)

               {

                   if(m%)

                   return nums3[k-];

                   else

                   return (nums3[k-]+nums3[k-])/2.0;

               }

             }

             return  ;

     }

 };

在leetcode中时间为48ms。

巴特西

leetcode 4. Median of Two Sorted Arrays

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