Even Number Counter

Easy

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1 upvote

Problem statement

You are given an array arr of n integers. Your task is to count how many of these integers are even.

Detailed explanation ( Input/output format, Notes, Images )

Input Format:

The first line of input contains an integer 'n', representing the size of the array.

The second line contains 'n' space-separated integers, representing the elements of the array arr.

Output Format:

Print a single integer representing the total count of even numbers in the array.

Note:

An integer is considered even if it is perfectly divisible by 2 (i.e., number % 2 == 0).

Zero (0) is an even number.

Negative even numbers (e.g., -2, -4) should also be counted.

Sample Input 1:

6
4 7 2 9 8 3

Sample Output 1:

Explanation for Sample 1:

The numbers in the array are 4, 7, 2, 9, 8, and 3.
The even numbers among them are 4, 2, and 8. The total count is 3.

Sample Input 2:

5
1 3 5 7 9

Sample Output 2:

Explanation for Sample 2:

There are no even numbers in the given array.

Expected Time Complexity:

The expected time complexity is O(n).

Constraints:

1 <= n <= 10^5
-10^9 <= arr[i] <= 10^9
Time limit: 1 sec

Approaches (1)

Approach 1

Even Number Counter

Time Complexity

Space Complexity

(100% EXP penalty)

Even Number Counter

Console