# HG changeset patch
# User Jordi Gutiérrez Hermoso <jordigh@octave.org>
# Date 1513486046 18000
# Node ID f1f0220b5f7ccef9529a3a75a83fd06520fd1409
# Parent  8d1edc9efcb4b426a2c6b3a248ba6788161cd700
day 16: simply loop

diff --git a/2017/day16.d b/2017/day16.d
--- a/2017/day16.d
+++ b/2017/day16.d
@@ -29,13 +29,10 @@
 }
 
 auto iteratePerm(string[] ops, string progs) {
-  string[] seenprogs = [progs];
-  string result = progs;
-  while(true) {
-    result = ops.parseOps(result);
-    if(seenprogs.canFind(result)) {
-      break;
-    }
+  string[] seenprogs;
+  for(string result = progs;
+      !seenprogs.canFind(result);
+      result = ops.parseOps(result)) {
     seenprogs ~= result;
   }
   return seenprogs[1_000_000_000 % seenprogs.length];