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Here given a user input positive integer array. Our task is to find out the number occurring odd number of times.

Input : A=[2, 4, 7, 7, 4, 2, 2] Output : 2

Step 1: Input Array element. Step 2: Write lambda expression and apply. Step 3: Reduce function over the input list until a single value is left. Step 4: Expression reduces the value of a^b into a single value. Step 5: a starts from 0 and b starts from 1.

# Python program to find the Number # Occurring Odd Number of Times # using Lambda expression and reduce function from functools import reduce def timeoccurrance(inp): print ("RESULT ::>",reduce(lambda a, b: a ^ b, inp))) # Driver program if __name__ == "__main__": A=list() n1=int(input("Enter the size of the List ::")) print("Enter the Element of List ::") for i in range(int(n1)): k=int(input("")) A.append(k) timeoccurrance(A)

Enter the size of the List :: 7 Enter the Element of List :: 1 2 3 2 3 1 3 RESULT ::> 3

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