Q-14 PepCoding | Equivalent Subarrays

PHOTO

Wed Jan 25 2023 06:18:06 GMT+0000 (Coordinated Universal Time)

Saved by @Ayush_dabas07

class Solution
{ 
    // Method to calculate distinct sub-array 
    static int countDistinctSubarray(int arr[], int n) 
    {   
        //similiar to previous question
        //finding total unique numbers
        HashSet<Integer> set = new HashSet<>();
        for(int val : arr)
        set.add(val);
        
        int k = set.size();
        
        //exactly k strings = atmost(k) - atmost(k-1)
        return atmostK(arr , k) - atmostK(arr,k-1);
            
        
    }
    
    //finding atmost(k) strings
    static int atmostK(int arr[] , int k){
        int ans = 0;
        
        int j = 0;
        HashMap<Integer,Integer> map = new HashMap<>();
        
        for(int i = 0 ;i < arr.length ; i++){
            int val = arr[i];
            map.put(val , map.getOrDefault(val,0)+1);
            
            while(map.size() > k){
                int temp = arr[j];
                
                if(map.get(temp) == 1)
                map.remove(temp);
                
                else
                map.put(temp , map.get(temp)-1);
                
                j++;
            }
            //adding all subtrings
            ans += i-j+1;
        }
        
        return ans;
    }
}

https://www.pepcoding.com/resources/data-structures-and-algorithms-in-java-levelup/hashmap-and-heaps/equivalent-subarrays-official/ojquestion

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