1 files changed, 2 insertions, 0 deletions
diff --git a/histogram.cpp b/histogram.cpp
index 2a275e7..be6ec41 100644
--- a/histogram.cpp
+++ b/histogram.cpp
@@ -1,7 +1,9 @@
 #include <iostream>
 #include <iomanip>
 #include <vector>
+#include <algorithm>
 #include <cmath>
+#include <cstring>
 #include <cassert>
 
 using namespace std;