Topic
1. Compare Arrays (Same Order)2. Compare Arrays (Ignore Order)3. Merge Two Arrays4. Find Common Elements5. Elements in A Not in B6. Count Common Elements7. Element-wise Sum8. Element-wise Product9. Frequency Array10. Elements Appearing More Than Once

Elements Appearing More Than Once

Find elements that appear more than once.

IntermediatePhase 4 - Level 4: Aggregation & ComparisonExample 10 of 10
elements-appearing-more-than-once.py
1# Take array
2n = int(input("Enter array size: "))
3arr = []
4for i in range(n):
5    arr.append(int(input(f"Element {i+1}: ")))
6

7# Find duplicates
8freq = {}
9for element in arr:
10    freq[element] = freq.get(element, 0) + 1
11

12# Find elements appearing more than once
13duplicates = []
14for element, count in freq.items():
15    if count > 1:
16        duplicates.append(element)
17

18print(f"Elements appearing more than once: {duplicates}")

Output

Enter array size: 6
Element 1: 1
Element 2: 2
Element 3: 2
Element 4: 3
Element 5: 3
Element 6: 3
Elements appearing more than once: [2, 3]

What's going on

Count frequency and filter duplicates.

Key Concepts:

Count frequency of each element
Check if count > 1
Collect duplicates

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PreviousFrequency Array