#include <bits/stdc++.h>
using namespace std;
const int N=1e5+4;
int sz[N],t[N],ans;
bool bj[N];
int solve(int n,int m,vector<int> f,vector<vector<int>> s){
    ans=0;
    for(int i=0;i<=n;i++) sz[i]=0,t[i]=0,bj[i]=0;
    n--;
    for(int i=0;i<n;i++) sz[f[i]]++;
    int cnt=0,last=-1,ccnt=0;
    for(int i=0;i<n;i++){
        for(int j=0;j<m;j++){
            t[s[j][i]]++;
            if(t[s[j][i]]==1) cnt++;
            if(t[s[j][i]]==m) cnt--;
        }
        if(cnt==0){
            for(int j=last+1;j<=i;j++){
                bj[s[0][j]]=1;
                if(sz[s[0][j]]) ccnt++;
                sz[f[s[0][j]-1]]--;
                if(sz[f[s[0][j]-1]]==0&&bj[f[s[0][j]-1]]) ccnt--;
            }
            if(ccnt==0) ans++;
            last=i;
        }
    }
    // cout<<ans;
    return ans;
}
// int main(){
//     int n;
//     int m,x;
//     vector<int> f;
//     vector<vector<int>> s;
//     vector<int> c;
//     cin>>n>>m;
//     for(int i=1;i<n;i++) cin>>x,f.push_back(x);
//     for(int j=1;j<=m;j++){
//         for(int i=1;i<n;i++)cin>>x,c.push_back(x);
//         s.push_back(c);
//         c.clear();
//     }
//     solve(n,m,f,s);
//     return 0;
// }

In file included from implementer.cpp:1:
september.h:3:72: error: ‘>>’ should be ‘> >’ within a nested template argument list
    3 | int solve(int N, int M, std::vector<int> F, std::vector<std::vector<int>> S);
      |                                                                        ^~
      |                                                                        > >
implementer.cpp: In function ‘int mtbpdhr2zxjo1o4i9oreohsbuzzl4s6u::taskcase()’:
implementer.cpp:14:44: error: ‘>>’ should be ‘> >’ within a nested template argument list
   14 |                 std::vector<std::vector<int>> S(M, std::vector<int>(N - 1));
      |                                            ^~
      |                                            > >
implementer.cpp: In function ‘int mtbpdhr2zxjo1o4i9oreohsbuzzl4s6u::mian()’:
implementer.cpp:21:64: error: ‘nullptr’ was not declared in this scope
   21 |                 std::ios::sync_with_stdio(false); std::cin.tie(nullptr); std::cout.tie(nullptr);
      |                                                                ^~~~~~~
implementer.cpp:27:25: error: ‘exit’ was not declared in this scope
   27 |                         exit(0);
      |                         ^~~~
implementer.cpp:4:1: note: ‘exit’ is defined in header ‘<cstdlib>’; did you forget to ‘#include <cstdlib>’?
    3 | #include <iostream>
  +++ |+#include <cstdlib>
    4 | #include <string>
answer.code:6:54: error: ‘>>’ should be ‘> >’ within a nested template argument list
    6 | int solve(int n,int m,vector<int> f,vector<vector<int>> s){
      |                                                      ^~
      |                                                      > >