Given a non-empty array of non-negative integers nums, the degree of this array is defined as the maximum frequency of any one of its elements.
Your task is to find the smallest possible length of a (contiguous) subarray of nums, that has the same degree as nums.
Example 1:
Input: [1, 2, 2, 3, 1] Output: 2 Explanation: The input array has a degree of 2 because both elements 1 and 2 appear twice. Of the subarrays that have the same degree: [1, 2, 2, 3, 1], [1, 2, 2, 3], [2, 2, 3, 1], [1, 2, 2], [2, 2, 3], [2, 2] The shortest length is 2. So return 2.
Example 2:
Input: [1,2,2,3,1,4,2] Output: 6
class Solution { 2 public: 3 int findShortestSubArray(vector<int>& nums) { 4 int len = nums.size() ; 5 if (len < 2) 6 return len ; 7 int Max = 0 ; 8 unordered_map<int,int> startIndex , count ; 9 int res = len ; 10 for(int i = 0 ; i < len ; i++){ 11 if (startIndex.count(nums[i]) == 0) 12 startIndex[nums[i]] = i ; 13 count[nums[i]]++ ; 14 if (count[nums[i]] > Max){ 15 res = i - startIndex[nums[i]] + 1 ; 16 Max = count[nums[i]] ; 17 } 18 if (count[nums[i]] == Max){ 19 res = min(i - startIndex[nums[i]] + 1 , res) ; 20 } 21 } 22 return res ; 23 } 24 };