Python program to create a sorted merged list of two unsorted list

Here two user input list is given, the elements of two lists are unsorted. Our task is to merged these two unsorted array and after that sort the list.

Example

Input: A [] = {100, 50, 150}
       B [] = {200, 30, 20}
Output: Merge List:{20, 30, 50, 100, 150, 200}

Algorithm

Step 1: first we create two user input list.
Step 2: Final merge list size is (size of the first list + the size of the second list).
Step 3: then sort two list using sort() method.
Step 4: Merge two sorted list and store it into a third list.
Step 5: Merging remaining elements of a[] (if any).Merging remaining elements of b[] (if any).
Step 6: display merged sorted list.

Example Code

# Python program to merge two unsorted lists 
# in sorted order
# Function to merge array in sorted order
def unsortedarray (a, b, res, n, m):
   # Sorting a[] and b[]
   a.sort()
   b.sort()
   # Merge two sorted arrays into res[]
   i, j, k = 0, 0, 0
   while (i < n and j < m):
      if (a[i] <= b[j]):
         res[k] = a[i]
         i += 1
         k += 1
      else:
         res[k] = b[j]
         j += 1
         k += 1
   while (i < n):  # Merging remaining
      # elements of a[] (if any)
      res[k] = a[i]
      i += 1
      k += 1
   while (j < m):  # Merging remaining
      # elements of b[] (if any)
      res[k] = b[j]
      j += 1
      k += 1
# Driver code
A=list()
n=int(input("Enter the size of the First List ::"))
print("Enter the Element of First List ::")
for i in range(int(n)):
   k=int(input(""))
   A.append(k)
B=list()
m=int(input("Enter the size of the Second List ::"))
print("Enter the Element of Second List ::")
for i in range(int(n)):
   k=int(input(""))
   B.append(k)
# Final merge list
res = [0 for i in range(n + m)]
unsortedarray(A, B, res, n, m)
print ("Sorted merged list :")
for i in range(n + m):
   print (res[i],)

Output

Enter the size of the First List: 4
Enter the Element of First List::
8
79
56
3
Enter the size of the Second List: 4
Enter the Element of Second List::
67
1
9
45
Sorted merged list:
1
3
8
9
45
56
67
79

karthikeya Boyini

Updated on 30-Jul-2019 22:30:23

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