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:




function countOdds(low, high) {
  if (low % 2 === 0 && high % 2 === 0) return (high - low) / 2;
  return ~~((high - low) / 2) + 1;
}

沒記錯好像是programiming skills 1第一天的題目
跟吉神學習惹 (看下面那個)
Marsgoat Feb 13, 2023



var countOdds = function(low, high) {
    return Math.floor((high + 1) / 2) - Math.floor(low / 2);
};

Yen-Chi ChenMon, Feb 13, 2023

[1, high]之間的奇數數量 - [1, low-1]之間的奇數數量






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

Yen-Chi ChenMon, Feb 13, 2023



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

Ron Chen Feb 13, 2023



class Solution:
    def countOdds(self, low: int, high: int) -> int:
        return (high + 1) // 2 - low // 2

Yen-Chi ChenMon, Feb 13, 2023





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

JimFeb 13, 2023