func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 100010;   const int SIZ = 500;   inline void read(int &x) {     x = 0;     int f = 1;     char ch = getchar();     while (ch <  0  || ch >  9 ) {       if (ch ==  - ) {         f = -1;       }       ch = getchar();     }     while (ch >=  0  && ch <=  9 ) {       x = x * 10 + ch -  0 ;       ch = getchar();     }     x *= f;   }   struct note {     int t;     int next;   };   int cnt;   int head[N];   note e[N << 1];   inline void add(int x, int y) {     e[++cnt].t = y;     e[cnt].next = head[x];     head[x] = cnt;   }   int n, m;   namespace tl {   int cnt;   int id[N], iid[N];   int fa[N];   int top[N], son[N], siz[N];   void dfs1(int p, int f) {     fa[p] = f;     siz[p] = 1;     for (int i = head[p]; i + 1; i = e[i].next) {       int t = e[i].t;       if (t == f) {         continue;       }       dfs1(t, p);       siz[p] += siz[t];       if (siz[t] > siz[son[p]]) {         son[p] = t;       }     }   }   void dfs2(int p, int top_p) {     id[p] = ++cnt;     iid[cnt] = p;     top[p] = top_p;     if (son[p]) {       dfs2(son[p], top_p);     }     for (int i = head[p]; i + 1; i = e[i].next) {       int t = e[i].t;       if (t == fa[p] || t == son[p]) {         continue;       }       dfs2(t, t);     }   }   int bol;   int idb[N];   int tag[N / SIZ + 10];   int l[N / SIZ + 10], r[N / SIZ + 10];   int col[N];   int sum[N / SIZ + 10][N << 1];   int t[N];   int a[N];   inline void input() {     for (int i = 1; i <= n; i++) {       read(t[i]);       t[i]++;     }   }   inline void init() {     dfs1(1, -1);     dfs2(1, 1);     for (int i = 1; i <= n; i++) {       idb[i] = (i - 1) / SIZ + 1;       if (idb[i] != idb[i - 1]) {         r[idb[i - 1]] = i - 1;         l[idb[i]] = i;       }     }     r[idb[n]] = n;     for (int i = 1; i <= n; i++) {       a[id[i]] = n - t[i];     }     for (int i = 1; i <= n; i++) {       sum[idb[i]][a[i]]++;     }   }   int ans;   inline void update(int l, int r, int val) {     for (int i = l; i <= r; i++) {       int o = idb[i];       if (!col[i] && a[i] >= n - tag[o]) {         ans--;       }       if (!col[i]) {         sum[o][a[i]]--;       }       a[i] += val;       if (!col[i]) {         sum[o][a[i]]++;       }       if (!col[i] && a[i] >= n - tag[o]) {         ans++;       }     }   }   inline void modify(int L, int R, int val) {     int x = idb[L], y = idb[R];     if (x == y) {       update(L, R, val);       return;     }     update(L, r[x], val);     update(l[y], R, val);     for (int i = x + 1; i <= y - 1; i++) {       if (val == 1) {         tag[i]++;         ans += sum[i][n - tag[i]];       } else {         ans -= sum[i][n - tag[i]];         tag[i]--;       }     }   }   inline void query(int x) {     int val = (x > 0) ? 1 : -1;     x = abs(x);     col[id[x]] ^= 1;     if (a[id[x]] >= n - tag[idb[id[x]]]) {       ans -= val;     }     sum[idb[id[x]]][a[id[x]]] -= val;     while (x + 1) {       modify(id[top[x]], id[x], val);       x = fa[top[x]];     }     printf( %d  , ans);   }   }  // namespace tl   int main() {     memset(head, -1, sizeof(head));     read(n), read(m);     for (int i = 2; i <= n; i++) {       int x;       read(x);       add(x, i);       add(i, x);     }     tl::input();     tl::init();     for (int i = 1; i <= m; i++) {       int x;       read(x);       tl::query(x);     }     puts(  );     return 0;   }   