Added solution - LeetHub

Author: anand-3399

Reverse array in groups - GFG/reverse-array-in-groups.cpp

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+//{ Driver Code Starts
+//Initial template for C++
+
+#include <bits/stdc++.h>
+using namespace std;
+
+
+// } Driver Code Ends
+//User function template for C++
+
+class Solution{
+public:
+    //Function to reverse every sub-array group of size k.
+    void reverseInGroups(vector<long long>& arr, int n, int k){
+        // total groups
+        int no_of_groups = n/k;
+        // remaining elements
+        int remaining = n%k;
+        int i = 0;
+        while (no_of_groups)
+        {
+            reverse(arr.begin() + i, arr.begin() + i + k);
+            i += k;
+            no_of_groups--;
+        }
+        reverse(arr.end() - remaining, arr.end());
+    }
+};
+
+//{ Driver Code Starts.
+int main() {
+    int t; 
+    cin >> t; 
+    while(t--){ 
+        int n;
+        cin >> n; 
+        vector<long long> arr; 
+        int k;
+        cin >> k; 
+
+        for(long long i = 0; i<n; i++)
+        {
+            long long x;
+            cin >> x; 
+            arr.push_back(x); 
+        }
+        Solution ob;
+        ob.reverseInGroups(arr, n, k);
+        
+        for(long long i = 0; i<n; i++){
+            cout << arr[i] << " "; 
+        }
+        cout << endl;
+    }
+    return 0;
+}
+
+
+// } Driver Code Ends