26 lines
577 B
C++
26 lines
577 B
C++
#include <iostream>
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#include <numeric>
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/**
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* 2427. Number of Common Factors
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*
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* Given two positive integers a and b, return the number of common factors of a and b.
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* An integer x is a common factor of a and b if x divides both a and b.
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*/
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class Solution {
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public:
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static constexpr inline int commonFactors(int a, int b) {
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int x = std::gcd(a, b), ret = 0;
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for (int i = 1; i * i <= x; ++i)
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ret += ((x % i == 0) << 1) - (i * i == x);
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return ret;
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}
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};
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int main() {
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std::cout << Solution::commonFactors(452, 392);
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std::cout << std::gcd(452, 392);
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return 0;
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}
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