1523. Count Odd Numbers in an Interval Range

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 <= low <= high <= 10^9

class Solution {
    public int countOdds(int low, int high) {
        int res =  0;
        if(low % 2 != 0) {
            res = 0;
            while(low <= high) {
                res++;
                low+=2;
            }
        }
        else {
            low += 1;
            while(low <= high) {
                res++;
                low += 2;
            }
        }
        return res;
    }
}

求俩数之间奇数的个数

class Solution {
    public int countOdds(int low, int high) {
        return (high + 1) / 2 - low / 2;
    }
}

 

 lee哥的https://leetcode.com/problems/count-odd-numbers-in-an-interval-range/discuss/754726/JavaC%2B%2BPython-1-Lines