From e2dc8c813b1abcf9b9c1aa2518602af9050738f3 Mon Sep 17 00:00:00 2001
From: E7-87-83 <fungcheokyin@gmail.com>
Date: Wed, 30 Mar 2022 10:08:59 +0800
Subject: optimize

---
 challenge-158/cheok-yin-fung/dart/ch-2.dart | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/challenge-158/cheok-yin-fung/dart/ch-2.dart b/challenge-158/cheok-yin-fung/dart/ch-2.dart
index 08b2ad77b0..265cae1291 100644
--- a/challenge-158/cheok-yin-fung/dart/ch-2.dart
+++ b/challenge-158/cheok-yin-fung/dart/ch-2.dart
@@ -18,7 +18,8 @@ void main(List<String> args) {
   while (pp <= arg) {
     if (pp % 5 == 0) continue;  // pp must be coprime to 2 and 3.
     if (spokes.last <= sqrt(pp)) {
-      for (int k=1; k*30 <= sqrt(pp); k++)
+      var k = ((spokes.last+1)/30).floor();
+      for (; k*30 <= sqrt(pp); k++)
         rp_to_30.forEach( (e) => spokes.add(e+k*30) );
     }
     y++;
-- 
cgit