Question: Where should I place a count variable to count how many swaps occurs in this quick sort. I currently have the swap inside of the
Where should I place a count variable to count how many swaps occurs in this quick sort. I currently have the swap inside of the partition but i keep recieving swaps even when no swaps occur. Here is the code
/* This function takes last element as pivot, places the pivot element at its correct position in sorted array, and places all smaller (smaller than pivot) to left of pivot and all greater elements to right of pivot */ int partition (int arr[], int low, int high,int& swap1) { int pivot = arr[high]; // pivot int i = (low - 1); // Index of smaller element for (int j = low; j <= high- 1; j++) { // If current element is smaller than or // equal to pivot if (arr[j] <= pivot) { i++; // increment index of smaller element swap(arr[i], arr[j]); swap1++; //<- Here is where i placed the swap. } } swap(arr[i + 1], arr[high]); //swap1++; return (i + 1); } /* The main function that implements QuickSort arr[] --> Array to be sorted, low --> Starting index, high --> Ending index */ void quickSort(int arr[], int low, int high,int& swap1) { if (low < high) { /* pi is partitioning index, arr[p] is now at right place */ int pi = partition(arr, low, high,swap1); // Separately sort elements before // partition and after partition quickSort(arr, low, pi - 1,swap1); quickSort(arr, pi + 1, high,swap1); } }
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