From 09eebc492ac4f64b4f12542a17190109762ea6aa Mon Sep 17 00:00:00 2001
From: Allen Guan <me@nella17.tw>
Date: Fri, 29 Oct 2021 12:27:16 +0800
Subject: [PATCH] merge: fix: optimize PrimeFactors (#823)

---
 Maths/PrimeFactors.js | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/Maths/PrimeFactors.js b/Maths/PrimeFactors.js
index e1282c153..d4f3750f5 100644
--- a/Maths/PrimeFactors.js
+++ b/Maths/PrimeFactors.js
@@ -7,12 +7,10 @@ export const PrimeFactors = (n) => {
   // input: n: int
   // output: primeFactors: Array of all prime factors of n
   const primeFactors = []
-  for (let i = 2; i <= n; i++) {
-    if (n % i === 0) {
-      while (n % i === 0) {
-        primeFactors.push(i)
-        n = Math.floor(n / i)
-      }
+  for (let i = 2; i * i <= n; i++) {
+    while (n % i === 0) {
+      primeFactors.push(i)
+      n = Math.floor(n / i)
     }
   }
   if (n > 1) {