# Block swap algorithm for array rotation in C++

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#include <iostream> using namespace std; void swapSubArray(int arr[], int start, int end, int k){ int temp; for(int i = 0; i < k; i++) { temp = arr[start + i]; arr[start + i] = arr[end + i]; arr[end + i] = temp; } } void blockSwapAlgoIt(int arr[], int k, int size) { int i, j; if(k == 0 || k == size) return; i = k; j = size - k; while (i != j) { if(i < j){ swapSubArray(arr, k-i, k+j-i, i); j -= i; } else{ swapSubArray(arr, k-i, k, j); i -= j; } } swapSubArray(arr, k-i, k, i); } int main() { int arr[] = {4, 6, 1, 8, 9, 2}; int size = sizeof(arr) / sizeof(arr[0]); int k = 3; cout<<"Array before rotations :\t"; for(int i = 0; i<size; i++) cout<<arr[i]<<" "; blockSwapAlgoIt(arr, k, size); cout<<"\nArray after rotating "<<k<<" times :\t"; for(int i = 0; i<size; i++) cout<<arr[i]<<" "; return 0; }

# Block swap algorithm for array rotation in C++ (GNU GCC v7.1.1)

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