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struct Sol {
  void Test() {
    int n;
    cin>>n;
    VVI slo(n + 2);
    VI pars(n + 2);
    FOR (i, 2, n) {
      int par;
      cin>>par;
      pars[i] = par;
      slo[i].PB(par);
      slo[par].PB(i);
    }
    LCA lca(slo);
    HLDSum hld(slo, n, false);
    int q;
    cin>>q;
    REP (_, q) {
      int typ;
      cin>>typ;
      if (typ == 2) {
        int v;
        cin>>v;
        hld.Upd(v, pars[v], 1);
      } else {
        int a, b;
        cin>>a>>b;
        int dis = lca.Dis(a, b);
        dis -= hld.Query(a, b);
        cout<<dis<<"\n";
      }
    }
  }
};

prog.cpp: In member function 'void Sol::Test()':
prog.cpp:4:5: error: 'cin' was not declared in this scope
     cin>>n;
     ^
prog.cpp:5:5: error: 'VVI' was not declared in this scope
     VVI slo(n + 2);
     ^
prog.cpp:6:5: error: 'VI' was not declared in this scope
     VI pars(n + 2);
     ^
prog.cpp:7:10: error: 'i' was not declared in this scope
     FOR (i, 2, n) {
          ^
prog.cpp:7:17: error: 'FOR' was not declared in this scope
     FOR (i, 2, n) {
                 ^
prog.cpp:14:5: error: 'LCA' was not declared in this scope
     LCA lca(slo);
     ^
prog.cpp:15:5: error: 'HLDSum' was not declared in this scope
     HLDSum hld(slo, n, false);
     ^
prog.cpp:18:10: error: '_' was not declared in this scope
     REP (_, q) {
          ^
prog.cpp:18:14: error: 'REP' was not declared in this scope
     REP (_, q) {
              ^

Standard output is empty