From b32c3bb8a8233ff11e7436319fa952da0195439f Mon Sep 17 00:00:00 2001
From: Bryce S <44215173+GHumorBS@users.noreply.github.com>
Date: Thu, 26 Aug 2021 16:20:26 +0800
Subject: [PATCH] =?UTF-8?q?Update=200454.=E5=9B=9B=E6=95=B0=E7=9B=B8?=
 =?UTF-8?q?=E5=8A=A0II.md?=
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更新python算法：明明用了defaultdict[key: int]默认value等于0，却仍要画蛇添足：
value = hashmap.get(key)
count += value or 0
这也太奇怪了8！！！
---
 problems/0454.四数相加II.md | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/problems/0454.四数相加II.md b/problems/0454.四数相加II.md
index 7bb24e59..4e61dc2f 100644
--- a/problems/0454.四数相加II.md
+++ b/problems/0454.四数相加II.md
@@ -161,15 +161,9 @@ class Solution(object):
 #         count=0
 #         for x3 in nums3:
 #             for x4 in nums4:
-#                 key = -x3-x4
-#                 value = hashmap.get(key)
-
-                  # dict的get方法会返回None（key不存在）或者key对应的value
-                  # 所以如果value==0，就会继续执行or，count+0，否则就会直接加value
-                  # 这样就不用去写if判断了
-            
-#                 count += value or 0
-                
+#                 key = 0 - x3 - x4
+#                 value = hashmap[key]  # 若差值(key)不存在，则value被赋值0
+#                 count += value                
 #         return count
 
 ```