answer.code: In function ‘void gsz(long long int, long long int, long long int*)’:
answer.code:17:42: error: too few arguments to function ‘void gsz(long long int, long long int, long long int*)’
   17 |                 dep[v[0]]=dep[u]+v[1],gsz(v[0],u),sz[u]+=sz[v[0]];
      |                                       ~~~^~~~~~~~
answer.code:14:6: note: declared here
   14 | void gsz(int u,int f,int *dep){
      |      ^~~
answer.code: In function ‘void groot(long long int, long long int, long long int)’:
answer.code:22:23: error: cannot convert ‘std::array<long long int, 2>’ to ‘long long int’
   22 |                 groot(v,u,tot),mx=max(mx,sz[v[0]]);
      |                       ^
      |                       |
      |                       std::array<long long int, 2>
answer.code:19:16: note:   initializing argument 1 of ‘void groot(long long int, long long int, long long int)’
   19 | void groot(int u,int f,int tot){
      |                ^
answer.code: In function ‘void dfs(long long int, long long int)’:
answer.code:28:34: error: ‘f’ was not declared in this scope
   28 |         for(auto v:g[u])if(v[0]!=f&&!vis[v[0]]){
      |                                  ^
answer.code: At global scope:
answer.code:34:5: error: conflicting declaration ‘long long int rt [100009]’
   34 | int rt[100009],lcnt;
      |     ^~
answer.code:10:19: note: previous declaration as ‘long long int rt’
   10 | int n,ord[100009],rt,a[100009],b[100009],lvl[100009],fa[100009],dep[20][100009],sz[100009];
      |                   ^~
answer.code: In member function ‘long long int Line::c(long long int)’:
answer.code:35:44: error: invalid conversion from ‘long long int*’ to ‘long long int’ [-fpermissive]
   35 | struct Line{int k,x;int c(int x){return k*x+b;}}buf[2000009];
      |                                         ~~~^~
      |                                            |
      |                                            long long int*
answer.code: In member function ‘long long int segtree::query(long long int, long long int, long long int, long long int)’:
answer.code:51:26: error: lvalue required as left operand of assignment
   51 |                 int mid=l+r>>=1;
      |                         ~^~
answer.code: In function ‘void insert(long long int, long long int)’:
answer.code:60:38: error: invalid types ‘long long int[long long int]’ for array subscript
   60 |                 tr.upd(lcnt,0,MAXN,rt[u]);
      |                                      ^
answer.code: In function ‘long long int query(long long int)’:
answer.code:66:57: error: invalid types ‘long long int[long long int]’ for array subscript
   66 |                 res=min(res,tr.query(dep[d][p],0,MAXN,rt[u]));
      |                                                         ^