Merge pull request #38 from Aviral1-jain/patch-6

Create cycleSort.py

Author: admirerr

Python/sorting/cycleSort.py

@@ -0,0 +1,49 @@
+def cycleSort(array):
+    writes = 0
+
+    # Loop through the array to find cycles to rotate.
+    for cycleStart in range(0, len(array) - 1):
+        item = array[cycleStart]
+
+        # Find where to put the item.
+        pos = cycleStart
+        for i in range(cycleStart + 1, len(array)):
+            if array[i] < item:
+                pos += 1
+
+        # If the item is already there, this is not a cycle.
+        if pos == cycleStart:
+            continue
+
+        # Otherwise, put the item there or right after any duplicates.
+        while item == array[pos]:
+            pos += 1
+        array[pos], item = item, array[pos]
+        writes += 1
+
+        # Rotate the rest of the cycle.
+        while pos != cycleStart:
+
+            # Find where to put the item.
+            pos = cycleStart
+            for i in range(cycleStart + 1, len(array)):
+                if array[i] < item:
+                    pos += 1
+
+            # Put the item there or right after any duplicates.
+            while item == array[pos]:
+                pos += 1
+            array[pos], item = item, array[pos]
+            writes += 1
+
+    return writes
+
+
+# driver code
+arr = [1, 8, 3, 9, 10, 10, 2, 4]
+n = len(arr)
+cycleSort(arr)
+
+print("After sort : ")
+for i in range(0, n):
+    print(arr[i], end=' ')