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1. Check if Element Exists2. Count Occurrences3. Find First Occurrence4. Find Last Occurrence5. Check Uniqueness6. Sum of Even Elements7. Sum of Odd Elements8. Count Prime Numbers9. Count Divisible by 3 & 510. Count Perfect Squares

Check if Element Exists

Check if x exists in array.

IntermediatePhase 4 - Level 2: Searching & Counting LogicExample 1 of 10
check-if-element-exists.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

7x = int(input("Enter element to search: "))
8

9# Check existence
10if x in arr:
11    print(f"{x} exists in array")
12else:
13    print(f"{x} does not exist in array")

Output

Enter array size: 5
Element 1: 10
Element 2: 20
Element 3: 30
Element 4: 20
Element 5: 40
Enter element to search: 20
20 exists in array

What's going on

Use 'in' operator to check membership.

Key Concepts:

'in' operator checks existence
Returns True if found
Simple membership test

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