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Python Program for Counting Sort
In this article, we will learn about the solution to the problem statement given below.
Problem statement− We are given an array, we need to sort the array using the concept of counting sort.
Counting sort is a technique in which we work on keys between a specific range. It involves counting the number of objects which have distinct key & values. Finally, we do arithmetic calculations to obtain the position of each object and display the output.
Now let’s observe the solution in the implementation below −
Example
def countSort(arr):
# The output character array that will have sorted arr
output = [0 for i in range(256)]
# Create a count array initialized with 0
count = [0 for i in range(256)]
# as strings are immutable
ans = ["" for _ in arr]
# count
for i in arr:
count[ord(i)] += 1
# position of character in the output array
for i in range(256):
count[i] += count[i-1]
# output character array
for i in range(len(arr)):
output[count[ord(arr[i])]-1] = arr[i]
count[ord(arr[i])] -= 1
# array of sorted charcters
for i in range(len(arr)):
ans[i] = output[i]
return ans
# main
arr = "Tutorialspoint"
ans = countSort(arr)
print ("Sorted character array is "+str("".join(ans)))Output −
Sorted character array is Taiilnooprsttu
All the variables are declared in the local scope and their references are seen in the figure above.
Conclusion
In this article, we have learned about how we can make a Python Program for Counting Sort
Updated on: 20-Dec-2019
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