From 69159d822a4502fe011e60125bb0ef50748910ce Mon Sep 17 00:00:00 2001
From: Anthony Wang
Date: Mon, 14 Mar 2022 21:10:31 -0500
Subject: 1641C

---
 codeforces.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/codeforces.md b/codeforces.md
index 51c861f..3cc91ed 100644
--- a/codeforces.md
+++ b/codeforces.md
@@ -543,3 +543,5 @@
 - ~~1535E: Read the problem carefully and think about what classical problems that it's similar to and try to adapt that algorithm to work here~~
 
 - ~~1646E: Pretty trivial but make sure you read the limits correctly~~
+
+- 1641C: Optimize a slow solution using a set so every person is only processed once
-- 
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