From 914da8dc8f671e348b3a07db8b585b245c080aae Mon Sep 17 00:00:00 2001
From: soon <topsal95@gmail.com>
Date: Thu, 20 Apr 2023 00:29:02 +0800
Subject: [PATCH] ex6.3: Fix InterceptWith and DifferenceWith

---
 ex6.3/intset.go | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/ex6.3/intset.go b/ex6.3/intset.go
index 04e2bbb..80c48ee 100644
--- a/ex6.3/intset.go
+++ b/ex6.3/intset.go
@@ -49,10 +49,11 @@ func (s *IntSet) IntersectWith(t *IntSet) {
 	for i, tword := range t.words {
 		if i < len(s.words) {
 			s.words[i] &= tword
-		} else {
-			s.words = append(s.words, tword)
 		}
 	}
+	for i := len(t.words); i < len(s.words); i++ {
+		s.words[i] = 0
+	}
 }
 
 // Set s to the difference of s and t.
@@ -60,8 +61,6 @@ func (s *IntSet) DifferenceWith(t *IntSet) {
 	for i, tword := range t.words {
 		if i < len(s.words) {
 			s.words[i] &^= tword
-		} else {
-			s.words = append(s.words, tword)
 		}
 	}
 }