diff --git a/1006E.cpp b/1006E.cpp
index 1ea1eb0..a8dbc7e 100644
--- a/1006E.cpp
+++ b/1006E.cpp
@@ -1,4 +1,5 @@
 #include <bits/stdc++.h>
+#include<string.h>
 using namespace std;
 const int N=1000001;
 vector<int>v[N];