From 0d7ab05f05c3a16df0b3c08053b34637eeb9dc08 Mon Sep 17 00:00:00 2001
From: Xiaoou WANG <16024291+xiaoouwang@users.noreply.github.com>
Date: Thu, 3 Nov 2022 16:32:49 +0100
Subject: [PATCH] Update birthday.py

starting from i to avoir comparing the same pair a second time
---
 chapter_02/birthday.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/chapter_02/birthday.py b/chapter_02/birthday.py
index 796c848..dc2f4f1 100644
--- a/chapter_02/birthday.py
+++ b/chapter_02/birthday.py
@@ -31,7 +31,7 @@
         match = 0
         b = np.random.randint(0,364,m)
         for i in range(m):
-            for j in range(m):
+            for j in range(i, m): # starting from i to avoir comparing the same pair a second time
                 if (i != j) and (b[i] == b[j]):
                     match += 1
         if (match != 0):