func_code_string: #include <bits/stdc++.h>   using namespace std;   const int maxn = 200020;   int a[maxn], b[maxn], pos[maxn], ans;   unsigned long long hsh, qpow[200020] = {1}, sum;   int n, m;   struct node {     unsigned long long a, tot;   } tr[maxn << 2];   void pushup(int p) {     tr[p].tot = tr[p << 1].tot + tr[p << 1 | 1].tot;     tr[p].a = tr[p << 1].a * qpow[tr[p << 1 | 1].tot] + tr[p << 1 | 1].a;   }   void update(int l, int r, int pos, int p, int k) {     if (l == r) {       if (!k)         tr[p].tot -= 1;       else         tr[p].tot += 1;       tr[p].a = k;       return;     }     int mid = l + r >> 1;     if (pos <= mid) update(l, mid, pos, p << 1, k);     if (pos > mid) update(mid + 1, r, pos, p << 1 | 1, k);     pushup(p);   }   int main() {     cin >> n >> m;     for (int i = 1; i <= n; i++) {       scanf( %lld , &a[i]);       hsh = hsh * 23 + a[i];       qpow[i] = qpow[i - 1] * 23;       sum += qpow[i - 1];     }     for (int i = 1; i <= m; i++) scanf( %lld , &b[i]), pos[b[i]] = i;     for (int i = 1; i <= m; i++) {       if (i > n) update(1, m, pos[i - n], 1, 0);       update(1, m, pos[i], 1, i);       int d = i - n;       if (d >= 0 && tr[1].a == d * sum + hsh) ++ans;     }     printf( %d , ans);   }   