geeksForGeeksSolutions/countDistinctElementsInEveryWindow.cpp at master · kk77777/geeksForGeeksSolutions · GitHub

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// { Driver Code Starts
#include <bits/stdc++.h>
using namespace std;

// } Driver Code Ends

class Solution
{
public:
    vector<int> countDistinct(int a[], int n, int k)
    {
        //code here.
        unordered_map<int, int> mp;
        vector<int> ans;
        int i = 0, dc = 0;
        for (; i < k; i++)
        {
            if (mp[a[i]] == 0)
            {
                dc++;
            }
            mp[a[i]]++;
        }
        ans.push_back(dc);
        for (; i < n; i++)
        {
            if (mp[a[i - k]] == 1)
            {
                dc--;
            }
            mp[a[i - k]]--;
            if (mp[a[i]] == 0)
            {
                dc++;
            }
            mp[a[i]]++;
            ans.push_back(dc);
        }
        return ans;
    }
};

// { Driver Code Starts.
int main()
{
    int t;
    cin >> t;
    while (t--)
    {

        int n, k;
        cin >> n >> k;
        int a[n];
        for (int i = 0; i < n; i++)
            cin >> a[i];
        Solution obj;
        vector<int> result = obj.countDistinct(a, n, k);
        for (int i : result)
            cout << i << " ";
        cout << endl;
    }
    return 0;
} // } Driver Code Ends