1523. Count Odd Numbers in an Interval Range

Source: Dev.to

Problem Description

Given two non‑negative integers low and high, return the count of odd numbers between low and high (inclusive).

Example 1

Input: low = 3, high = 7
Output: 3

Explanation: The odd numbers between 3 and 7 are [3, 5, 7].

Example 2

Input: low = 8, high = 10
Output: 1

Explanation: The odd numbers between 8 and 10 are [9].

Constraints

• 0

Complexity Analysis

• Time Complexity: O(1) – constant time arithmetic operations.
• Space Complexity: O(1) – only a few integer variables are used.

References

• Original problem: 1523. Count Odd Numbers in an Interval Range
• PHP implementation repository: