View Compilation Error

0_0_38583875_5809.cpp: In function 'int main()':
0_0_38583875_5809.cpp:10:6: error: 'strstr' was not declared in this scope
  if (strstr(a, "4") == NULL && strstr(a, "62") == NULL)
      ^~~~~~
0_0_38583875_5809.cpp:10:6: note: 'strstr' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
0_0_38583875_5809.cpp:3:1:
+#include <cstring>
 using namespace std;
0_0_38583875_5809.cpp:10:6:
  if (strstr(a, "4") == NULL && strstr(a, "62") == NULL)
      ^~~~~~