README_EN.md

2427. Number of Common Factors

中文文档

Description

Given two positive integers a and b, return the number of common factors of a and b.

An integer x is a common factor of a and b if x divides both a and b.

 

Example 1:

Input: a = 12, b = 6
Output: 4
Explanation: The common factors of 12 and 6 are 1, 2, 3, 6.

Example 2:

Input: a = 25, b = 30
Output: 2
Explanation: The common factors of 25 and 30 are 1, 5.

 

Constraints:

• 1 <= a, b <= 1000

Solutions

Python3

class Solution:
    def commonFactors(self, a: int, b: int) -> int:
        return sum(a % i == 0 and b % i == 0 for i in range(1, 1001))

Java

class Solution {
    public int commonFactors(int a, int b) {
        int ans = 0, n = Math.min(a, b);
        for (int i = 1; i <= n; ++i) {
            if (a % i == 0 && b % i == 0) {
                ++ans;
            }
        }
        return ans;
    }
}

C++

class Solution {
public:
    int commonFactors(int a, int b) {
        int ans = 0;
        int n = min(a, b);
        for (int i = 1; i <= n; ++i) {
            if (a % i == 0 && b % i == 0) {
                ++ans;
            }
        }
        return ans;
    }
};

Go

func commonFactors(a int, b int) int {
	ans := 0
	for i := 1; i <= a && i <= b; i++ {
		if a%i == 0 && b%i == 0 {
			ans++
		}
	}
	return ans
}

TypeScript

function commonFactors(a: number, b: number): number {
    const n = Math.min(a, b);
    let ans = 0;
    for (let i = 1; i <= n; i++) {
        if (a % i == 0 && b % i == 0) ans += 1;
    }
    return ans;
}

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