#include "september.h"
//#include "stub.cpp"
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int,int>
#define f first
#define s second
#define all(x) x.begin(),x.end()
#define _ ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
int solve(int n, int m, std::vector<int> F, std::vector<std::vector<int>> S) {
set<int> st;
int ans=0;
int cnt=0;
for(int i=0;i<n-1;i++){
cnt++;
for(int j=0;j<m;j++){
st.insert(S[j][i]);
}
if((int)st.size()==cnt){
st.clear();
ans++;
cnt=0;
}
}
return ans;
}
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