View Compilation Error

0_0_39111218_29288.cpp: In function 'void solve()':
0_0_39111218_29288.cpp:37:9: error: 'memset' was not declared in this scope
   37 |         memset(sum0,0,sizeof sum0);
      |         ^~~~~~
0_0_39111218_29288.cpp:4:1: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    3 | #include<vector>
  +++ |+#include <cstring>
    4 | #pragma GCC optimiz(3)
0_0_39111218_29288.cpp:49:12: error: too few arguments to function 'void dfs(long long int, long long int)'
   49 |         dfs(1);
      |         ~~~^~~
0_0_39111218_29288.cpp:17:6: note: declared here
   17 | void dfs(int u,int fa){
      |      ^~~