Task: Given an array arr[] of size N. Reverse every sub array of K elements. Example: Input: 1 5 3 1 2 3 4 5 Output: 3 2 1 5 4 Here is the Code: Program in C++: #include<iostream> #include<bits/stdc++.h> using namespace std; void reverseArrayInGroups(long long int *a,int n,int k) { int t=(n+k-1)/k; int i=0,j; stack<long long int> st; while(t--) { j=k; int l=i; while(j!=0&&i<n) { st.push(a[i]); i++; j--; } while(!st.empty()) { a[l]=st.top(); l++; st.p...