-
Notifications
You must be signed in to change notification settings - Fork 46
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Merge pull request #89 from manan-shxrma/patch-1
sCreate pigeonhole_sort
- Loading branch information
Showing
1 changed file
with
53 additions
and
0 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,53 @@ | ||
#include <bits/stdc++.h> | ||
using namespace std; | ||
|
||
/* Sorts the array using pigeonhole algorithm */ | ||
void pigeonholeSort(int arr[], int n) | ||
{ | ||
// Find minimum and maximum values in arr[] | ||
int min = arr[0], max = arr[0]; | ||
for (int i = 1; i < n; i++) | ||
{ | ||
if (arr[i] < min) | ||
min = arr[i]; | ||
if (arr[i] > max) | ||
max = arr[i]; | ||
} | ||
int range = max - min + 1; // Find range | ||
|
||
// Create an array of vectors. Size of array | ||
// range. Each vector represents a hole that | ||
// is going to contain matching elements. | ||
vector<int> holes[range]; | ||
|
||
// Traverse through input array and put every | ||
// element in its respective hole | ||
for (int i = 0; i < n; i++) | ||
holes[arr[i]-min].push_back(arr[i]); | ||
|
||
// Traverse through all holes one by one. For | ||
// every hole, take its elements and put in | ||
// array. | ||
int index = 0; // index in sorted array | ||
for (int i = 0; i < range; i++) | ||
{ | ||
vector<int>::iterator it; | ||
for (it = holes[i].begin(); it != holes[i].end(); ++it) | ||
arr[index++] = *it; | ||
} | ||
} | ||
|
||
// Driver program to test the above function | ||
int main() | ||
{ | ||
int arr[] = {8, 3, 2, 7, 4, 6, 8}; | ||
int n = sizeof(arr)/sizeof(arr[0]); | ||
|
||
pigeonholeSort(arr, n); | ||
|
||
printf("Sorted order is : "); | ||
for (int i = 0; i < n; i++) | ||
printf("%d ", arr[i]); | ||
|
||
return 0; | ||
} |