func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 100010;   const int LG_N = 20;   struct node {     int l, r, cnt;     node *left, *right;     node(int _l, int _r, int _c = 0) : l(_l), r(_r), cnt(_c) {}   };   node *init(int l, int r) {     node *p = new node(l, r);     if (l < r) {       int mid = (l + r) / 2;       p->left = init(l, mid);       p->right = init(mid + 1, r);     }     return p;   }   node *update(node *p, int idx) {     node *q = new node(p->l, p->r, p->cnt + 1);     if (p->l < p->r) {       int mid = (p->l + p->r) / 2;       q->left = (idx <= mid ? update(p->left, idx) : p->left);       q->right = (idx > mid ? update(p->right, idx) : p->right);     }     return q;   }   int seg_query(node *p, int l, int r) {     if (p->r < l or r < p->l) return 0;     if (l <= p->l and p->r <= r) return p->cnt;     return seg_query(p->left, l, r) + seg_query(p->right, l, r);   }   struct Query {     int type, u, v, k, y;     void read(void) {       scanf( %d , &type);       if (type == 1) {         scanf( %d , &u);       } else {         scanf( %d%d%d%d , &u, &v, &k, &y);       }     }   } query[N];   node *head[N];   vector<int> adj[N];   int P[N][LG_N], H[N];   int attack_year[N];   int n, m;   int root = 1;   int count(int u, int v, int l, int r) {     int ans = 0;     if (l > 0) {       ans += seg_query(head[u], 1, l - 1);       ans -= seg_query(head[v], 1, l - 1);     }     if (r < m + 1) {       ans += seg_query(head[u], r + 1, m + 1);       ans -= seg_query(head[v], r + 1, m + 1);     }     return ans;   }   int my_advance(int u, int l) {     for (int i = LG_N - 1; i >= 0; i--) {       if ((1 << i) <= l) {         l -= 1 << i;         u = P[u][i];       }     }     return u;   }   int lca(int u, int v) {     if (H[u] < H[v]) swap(u, v);     for (int i = LG_N - 1; i >= 0; i--) {       if (H[P[u][i]] >= H[v]) {         u = P[u][i];       }     }     if (u == v) return u;     for (int i = LG_N - 1; i >= 0; i--) {       if (P[u][i] != P[v][i]) {         u = P[u][i];         v = P[v][i];       }     }     return P[u][0];   }   void dfsInit(int u, int h) {     H[u] = h;     for (int i = 1; i < LG_N; i++) {       P[u][i] = P[P[u][i - 1]][i - 1];     }     head[u] = update(u == root ? (head[0] = init(0, m + 1)) : head[P[u][0]],                      attack_year[u]);     for (int v : adj[u]) {       dfsInit(v, h + 1);     }   }   int main() {     scanf( %d , &n);     for (int i = 1; i <= n; i++) {       int u;       scanf( %d , &u);       if (u == 0) {         root = i;       }       adj[u].push_back(i);       P[i][0] = u;     }     scanf( %d , &m);     for (int i = 1; i <= n; i++) {       attack_year[i] = m + 1;     }     for (int i = 1; i <= m; i++) {       query[i].read();       if (query[i].type == 1) {         attack_year[query[i].u] = i;       }     }     H[0] = 0;     dfsInit(root, 1);     for (int i = 1; i <= m; i++) {       if (query[i].type == 1) continue;       int u = query[i].u, v = query[i].v, k = query[i].k, y = query[i].y;       int l = lca(u, v);       k += (attack_year[u] < y + 1 or attack_year[u] > i);       int lo = 0, hi = H[u] - H[l];       while (lo < hi) {         int mid = (lo + hi) / 2;         if (count(u, my_advance(u, mid + 1), y + 1, i) >= k) {           hi = mid;         } else {           lo = mid + 1;         }       }       k -= count(u, my_advance(u, lo + 1), y + 1, i);       u = my_advance(u, lo);       if (k == 0) {         printf( %d n , (u == v ? -1 : u));         continue;       }       k = count(v, l, y + 1, i) - k + 1;       if (k >= 0) {         lo = 0, hi = H[v] - H[l];         while (lo < hi) {           int mid = (lo + hi) / 2;           if (count(v, my_advance(v, mid + 1), y + 1, i) >= k) {             hi = mid;           } else {             lo = mid + 1;           }         }         k -= count(v, my_advance(v, lo + 1), y + 1, i);         v = my_advance(v, lo);         if (lo == 0) {           k = -1;         }       }       if (k == 0) {         printf( %d n , v);       } else {         printf( -1 n );       }     }     return 0;   }   