View Compilation Error

0_0_39697978_21422.cpp: In function 'int main()':
0_0_39697978_21422.cpp:25:9: error: 'memset' was not declared in this scope
   25 |         memset(flag,0,sizeof(flag));
      |         ^~~~~~
0_0_39697978_21422.cpp:4:1: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    3 | #include <algorithm>
  +++ |+#include <cstring>
    4 |