Remove duplicate counting sort (#376)

sorts/counting_sort.py

@@ -57,8 +57,14 @@ def counting_sort(collection):
 
     return ordered
 
+def counting_sort_string(string):
+    return ''.join([chr(i) for i in counting_sort([ord(c) for c in string])])
+
 
 if __name__ == '__main__':
+    # Test string sort
+    assert "eghhiiinrsssttt" == counting_sort_string("thisisthestring")
+
     try:
         raw_input          # Python 2
     except NameError:

sorts/countingsort.py

@@ -1,42 +0,0 @@
-from __future__ import print_function
-# Python program for counting sort
- 
-# This is the main function that sort the given string arr[] in
-# in the alphabetical order 
-def countSort(arr):
- 
-    # The output character array that will have sorted arr
-    output = [0 for i in range(256)]
- 
-    # Create a count array to store count of inidividul
-    # characters and initialize count array as 0
-    count = [0 for i in range(256)]
- 
-    # For storing the resulting answer since the 
-    # string is immutable
-    ans = ["" for _ in arr]
- 
-    # Store count of each character
-    for i in arr:
-        count[ord(i)] += 1
- 
-    # Change count[i] so that count[i] now contains actual
-    # position of this character in output array
-    for i in range(256):
-        count[i] += count[i-1]
- 
-    # Build the output character array
-    for i in range(len(arr)):
-        output[count[ord(arr[i])]-1] = arr[i]
-        count[ord(arr[i])] -= 1
- 
-    # Copy the output array to arr, so that arr now
-    # contains sorted characters
-    for i in range(len(arr)):
-        ans[i] = output[i]
-    return ans 
- 
-# Driver program to test above function
-arr = "thisisthestring"
-ans = countSort(arr)
-print ("Sorted string array is %s"  %("".join(ans)))