From e997e0e12968acc5a0aa509bfd31e443158c098b Mon Sep 17 00:00:00 2001
From: "Vincent A. Cicirello" <cicirello@users.noreply.github.com>
Date: Fri, 4 Aug 2023 16:31:03 -0400
Subject: [PATCH] performance improvement to LargestCommonSubgraph

---
 CHANGELOG.md                                                    | 1 +
 .../org/cicirello/search/problems/LargestCommonSubgraph.java    | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index fb7bfd7d..468e2d47 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,6 +22,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Fixed potential int overflow in average computation in AbstractWeightedSelection.
 * Fixed potential int overflow in average computation in AbstractStochasticSampler.
 * Improved BlockInterchangeIterator.rollback().
+* Performance improvement to LargestCommonSubgraph
 
 ### Dependencies
 
diff --git a/src/main/java/org/cicirello/search/problems/LargestCommonSubgraph.java b/src/main/java/org/cicirello/search/problems/LargestCommonSubgraph.java
index 4f6f38c6..b974738d 100644
--- a/src/main/java/org/cicirello/search/problems/LargestCommonSubgraph.java
+++ b/src/main/java/org/cicirello/search/problems/LargestCommonSubgraph.java
@@ -407,7 +407,7 @@ private static LargestCommonSubgraph createInstanceGeneralizedPetersenGraph(
    * Private internal class for use within the LargestCommonSubgraph class for representing
    * edges.
    */
-  private class InternalEdge {
+  private static class InternalEdge {
     private final int x;
     private final int y;