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C++ Program for Cocktail Sort?
The Cocktail sort is another variation of bubble sort. In the bubble sort technique, it always searches from left to right, and finds the largest element at the end, in the second phase it finds the second largest element at the second last position. This sorting technique traverses in both directions alternatively. Let us see the algorithm to understand the idea.
Algorithm
cocktail(array, n)
Begin flag := true start := 0, end := n-1 while flag is set, do flag := false for i in range start to end-1, do if arr[i] > arr[i+1], then exchange arr[i] and arr[i+1] flag := true end if done if flag is not set, then break end if flag := false end := end – 1 for i in range end -1 down to start, do if arr[i] > arr[i+1], then exchange arr[i] and arr[i+1] flag := true end if done start := start + 1 done End
Example
#include<iostream>
using namespace std;
void cocktailSort(int arr[], int n){
bool flag = true;
int start = 0, end = n-1;
while(flag){
flag = false;
for(int i = start; i<end; i++){ //scan from left to right as bubble sort
if(arr[i] > arr[i+1]){
swap(arr[i], arr[i+1]);
flag = true;
}
}
if(!flag){ //if nothing has changed simply break the loop
break;
}
flag = false;
end--; //decrease the end pointer
for(int i = end - 1; i >= start; i--){ //scan from right to left
if(arr[i] > arr[i+1]){
swap(arr[i], arr[i+1]);
flag = true;
}
}
start++;
}
}
main() {
int data[] = {54, 74, 98, 154, 98, 32, 20, 13, 35, 40};
int n = sizeof(data)/sizeof(data[0]);
cout << "Sorted Sequence ";
cocktailSort(data, n);
for(int i = 0; i <n;i++){
cout << data[i] << " ";
}
}Output
Sorted Sequence 13 20 32 35 40 54 74 98 98 154
Updated on: 30-Jul-2019
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