From 42b89cfb56dba3ab10d8a571a64818185613dfe4 Mon Sep 17 00:00:00 2001
From: Anthony Wang
Date: Tue, 15 Dec 2020 14:48:14 -0600
Subject: Update usaco.cpp

---
 Template/usaco.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Template/usaco.cpp b/Template/usaco.cpp
index 057e999..ba47815 100644
--- a/Template/usaco.cpp
+++ b/Template/usaco.cpp
@@ -2,7 +2,7 @@
 #include <ext/pb_ds/tree_policy.hpp>
 #include <ext/pb_ds/assoc_container.hpp>
 #include <ext/rope>
-#define io(name) freopen((str(name)+".in").c_str(), "r", stdin), freopen((str(name)+".out").c_str(), "w", stdout)
+#define io(name) if (fopen((str(name)+".in").c_str(), "r")) freopen((str(name)+".in").c_str(), "r", stdin), freopen((str(name)+".out").c_str(), "w", stdout)
 #define f first
 #define s second
 #define mp make_pair
-- 
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