Program to print all distinct elements of a given integer array in Python | Ordered Dictionary

Given an integer array, print all distinct elements in array. The given array may contain duplicates and the output should print every element only once. The given array is not sorted.

Examples:

Input: arr[] = {12, 10, 9, 45, 2, 10, 10, 45}
Output: 12, 10, 9, 45, 2

Input: arr[] = {1, 2, 3, 4, 5}
Output: 1, 2, 3, 4, 5

Input: arr[] = {1, 1, 1, 1, 1}
Output: 1

This problem has existing solution please refer Print All Distinct Elements of a given integer array link. We will solve this problem in python quickly using Ordered Dictionary. Approach is simple,

1. Convert array into dictionary data structure using OrderedDict.fromkeys(iterable) function, it converts any iterable into dictionary having elements as Key in the same order they appeared in array.
2. Now iterate through complete dictionary and print keys.

# Python program to print All Distinct
# Elements of a given integer array

from collections import OrderedDict

def printDistinct(input):
     # convert list into ordered dictionary
     ordDict = OrderedDict.fromkeys(input)

     # iterate through dictionary and get list of keys
     # list of keys will be resultant distinct elements
     # in array
     result = [ key for (key, value) in ordDict.items() ]

     # concatenate list of elements with ', ' and print
     print (', '.join(map(str, result)))

# Driver program
if __name__ == "__main__":
    input = [12, 10, 9, 45, 2, 10, 10, 45]
    printDistinct(input)

Output:

12, 10, 9, 45, 2

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