PROBLEM #1523 (Count Odd Numbers in an Interval Range | Math)

Given two non-negative integers low and high. Return the count of odd numbers between low and high (inclusive).

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Example 1

Input: low = 3, high = 7 Output: 3 Explanation: The odd numbers between 3 and 7 are [3,5,7].

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Example 2

Input: low = 8, high = 10 Output: 1 Explanation: The odd numbers between 8 and 10 are [9].

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Constraints

• $1$ <= low <= high <= $10^9$

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SOLUTIONS

Simple Math

• JAVA

class Solution {
    public int countOdds(int low, int high) {
        return low % 2 == 1 || high % 2 == 1
                ? (high - low)/2 + 1
                : (high - low)/2;
    }
}

• C++

class Solution {
public:
    int countOdds(int low, int high) {
        return low % 2 == 1 || high % 2 == 1
                ? (high - low)/2 + 1
                : (high - low)/2;
    }
};

• Python

class Solution:
    def countOdds(self, low: int, high: int) -> int:
        return (high - low)//2 + 1 if low % 2 == 1 or high % 2 == 1 else (high - low)//2