diff --git a/CycleSort.cpp b/CycleSort.cpp new file mode 100644 index 00000000..0cfd252c --- /dev/null +++ b/CycleSort.cpp @@ -0,0 +1,78 @@ +// C++ program to implement cycle sort +#include +using namespace std; + +// Function sort the array using Cycle sort +void cycleSort (int arr[], int n) +{ + // count number of memory writes + int writes = 0; + + // traverse array elements and put it to on + // the right place + for (int cycle_start = 0; cycle_start <= n - 2; cycle_start++) + { + // initialize item as starting point + int item = arr[cycle_start]; + + // Find position where we put the item. We basically + // count all smaller elements on right side of item. + int pos = cycle_start; + for (int i = cycle_start + 1; i < n; i++) + if (arr[i] < item) + pos++; + + // If item is already in correct position + if (pos == cycle_start) + continue; + + // ignore all duplicate elements + while (item == arr[pos]) + pos += 1; + + // put the item to it\'s right position + if (pos != cycle_start) + { + swap(item, arr[pos]); + writes++; + } + + // Rotate rest of the cycle + while (pos != cycle_start) + { + pos = cycle_start; + + // Find position where we put the element + for (int i = cycle_start + 1; i < n; i++) + if (arr[i] < item) + pos += 1; + + // ignore all duplicate elements + while (item == arr[pos]) + pos += 1; + + // put the item to it\'s right position + if (item != arr[pos]) + { + swap(item, arr[pos]); + writes++; + } + } + } + + // Number of memory writes or swaps + // cout << writes << endl ; +} + +// Driver program to test above function +int main() +{ + int arr[] = {1, 8, 3, 9, 10, 10, 2, 4 }; + int n = sizeof(arr) / sizeof(arr[0]); + cycleSort(arr, n) ; + + cout << "After sort : " << endl; + for (int i = 0; i < n; i++) + cout << arr[i] << " "; + return 0; +}