func_code_string: #include <bits/stdc++.h>   using namespace std;   const long long INF = 1e9 + 7;   const int N = 3e5 + 10;   int flag[N];   set<int> s[N];   int a[N];   int pos[N];   int main() {     int n, m;     scanf( %d%d , &n, &m);     for (int i = 1; i <= n; i++) {       scanf( %d , &a[i]);       pos[a[i]] = i;     }     while (m--) {       int x, y;       scanf( %d%d , &x, &y);       if (x == a[n]) continue;       if (y == a[n]) {         flag[x] = 1;       }       s[x].emplace(y);     }     int ans = n;     for (int i = n - 1; i > 0; i--) {       if (flag[a[i]]) {         int cnt = 0;         for (auto& x : s[a[i]]) {           if (pos[x] < i) continue;           if (pos[x] >= ans) continue;           cnt++;         }         if (cnt != ans - i - 1)           flag[a[i]] = 0;         else {           for (int j = i; j < ans; j++) {             int x = a[j], y = a[j + 1];             swap(a[j], a[j + 1]);             swap(pos[x], pos[y]);           }           ans--;         }       }     }     printf( %d n , n - ans);     return 0;   }   