How To Find The First Duplicate Element In A Given Array Of Integers In Python

Chapter: Python Last Updated: 27-05-2023 12:41:05 UTC

Program:

            /* ............... START ............... */
                

def find_first_duplicate(arr):
    num_set = set()
    
    for num in arr:
        if num in num_set:
            return num
        num_set.add(num)
    
    # If no duplicates found
    return None




array = [2, 5, 6, 3, 2, 7, 8, 5]
result = find_first_duplicate(array)

if result:
    print("First duplicate element:", result)
else:
    print("No duplicate element found.")



                /* ............... END ............... */
        

Output

First duplicate element: 2

Notes:

  • In this example, the find_first_duplicate function uses a set (num_set) to keep track of the numbers seen so far. It iterates over the array and checks if each number is already present in the set. If it is, it means the number is a duplicate, and the function returns that number as the first duplicate element. If no duplicates are found, it returns None.
  • In the provided array [2, 5, 6, 3, 2, 7, 8, 5], the first duplicate element is 2.
Similar Programs Chapter Last Updated
Python Program To Check Whether Element Present In Set Or Not Example Python 04-10-2023
Python Program To Find Maximum And Minimum Number In A Set Python 04-10-2023
Python Program To Check Symmetric Matrix Python 04-10-2023
Python Program To Find Subsets Of A Set Python 04-10-2023
Python Program To Find Power Set Of A Set Python 04-10-2023
Remove All Duplicates From List Python Python 04-10-2023
Python Program To Find Symmetric Difference Of Two Sets Python 27-09-2023
Python Program To Find Common Item From Two Set Python 27-09-2023
Python Program To Get Unique Values From A List Python 27-09-2023
Python Encode And Decode String With Key Python 24-09-2023
Python Simple Encrypt Decrypt String Python 24-09-2023
Python Format String To Specific Length Python 24-09-2023
Python Code To Check If String Contains Substring Python 24-09-2023
Python Program To Find Most Repeated Word In A String Python 23-09-2023
Split String Into Words Python Python 23-09-2023
Remove All Punctuation Python Python 23-09-2023
Python Program To Reverse An Array Python 23-09-2023
Python Program To Find Number Of Palindrome In A String Python 23-09-2023
Python Program To Find Longest Common Substring Python 23-09-2023
Python Program To Find Number Of Days In A Given Month And Year Python 22-09-2023
Python Program To Calculate Age Of A Person Python 22-09-2023
Python Code To Get Day Of Week Python 22-09-2023
Python Convert String To Date Without Time Python 22-09-2023
Python Program To Print Current Date And Time In Format dd/mm/yyyy Python 22-09-2023
Python Program To Find Working Days In A Month Python 19-09-2023
Python Code To Change Date Format Python 16-09-2023
Python Program To Calculate Number Of Days Between Two Dates Python 16-09-2023
Python Program To Calculate Age In Years Months And Days Python 16-09-2023
Python Program To Schedule A Job To Run After A Certain Amount Of Time Python 10-08-2023
Python Program To Schedule A Job To Run Randomly Once A Day Python 10-08-2023

1 2 3 4