View Compilation Error

0_0_38626957_31533.cpp: In function 'int main()':
0_0_38626957_31533.cpp:19:9: error: 'memset' was not declared in this scope
         memset(sum, '\0', sizeof(sum));//‘\0’ 是结束符,就是清空的意思(初始化)
         ^~~~~~
0_0_38626957_31533.cpp:19:9: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
0_0_38626957_31533.cpp:8:1:
+#include <cstring>
 #include<utility>
0_0_38626957_31533.cpp:19:9:
         memset(sum, '\0', sizeof(sum));//‘\0’ 是结束符,就是清空的意思(初始化)
         ^~~~~~