View Compilation Error

0_0_39528313_7717.cpp: In function 'void solve()':
0_0_39528313_7717.cpp:35:9: error: 'memset' was not declared in this scope
   35 |         memset(sum, 0, sizeof(sum));
      |         ^~~~~~
0_0_39528313_7717.cpp:7:1: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    6 | #include<vector>
  +++ |+#include <cstring>
    7 | #define MAXN 500000+1