Question

How to print the duplicate elements of an array (list) in Python

Answer 1

def printDuplicates(arr):
  for i in range(0, len(arr)):  
      for j in range(i+1, len(arr)):  
          if(arr[i] == arr[j]):  
              print(arr[j]); 


arr = [3, 5, 9, 1, 7, 8, 1, 9, 0, 3, 9];   

printDuplicates(arr)



'''
run:
 
3
9
9
1
9
        
'''

 

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Answer 2

def printDuplicates(arr):
    asize = len(arr) 
    duplicates = [] 
    for i in range(asize): 
        for j in range(i + 1, asize): 
            if arr[i] == arr[j] and arr[i] not in duplicates: 
                duplicates.append(arr[i]) 
    print(duplicates)



arr = [3, 5, 9, 1, 7, 8, 1, 9, 0, 3, 9];   

printDuplicates(arr)



'''
run:
 
[3, 9, 1]
        
'''

 

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