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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #define IOS cin.tie(nullptr)->sync_with_stdio(0),cin.exceptions(cin.failbit);
  4. #define lb(x) (x)&-(x)
  5. #define all(x) (x).begin(),(x).end()
  6. #define ll long long
  7.  
  8. constexpr int maxN=3e2+5;
  9.  
  10. int n,m,val[maxN][maxN],ptr[maxN];
  11.  
  12. bitset<maxN> vis;
  13.  
  14. vector<int> adj[maxN],adj2[maxN];
  15.  
  16. inline bool chk(int guess){
  17.     fill(ptr,ptr+n+1,0);
  18.     vis.reset();
  19.     for(int i = 1;i<=m;i++)adj[i].clear(),adj2[i].clear();
  20.     for(int i = 1;i<=n;i++)adj[val[i][0]].emplace_back(i);
  21.     for(int flag = 1;flag;){
  22.         flag = 0;
  23.         for(int j = 1;j<=m;j++)if(adj[j].size()>guess){
  24.             flag = 1;
  25.             vis[j]=1;
  26.             for(int k:adj[j]){
  27.                 while(ptr[k]<m&&vis[val[k][ptr[k]]])ptr[k]++;
  28.                 if(ptr[k]==m)return 0;
  29.                 adj[val[k][ptr[k]]].emplace_back(k);
  30.             }
  31.             adj[j].clear();
  32.         }
  33.     }
  34.     return 1;
  35. }
  36.  
  37. int main(){
  38.     IOS
  39.     cin>>n>>m;
  40.     for(int i = 1;i<=n;i++)for(int j = 0;j<m;j++)cin>>val[i][j];
  41.     for(int i = 1;i<=n;i++)if(chk(i))return cout<<i<<'\n',0;
  42. }
Success #stdin #stdout 0.01s 5280KB
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4 5
5 1 3 4 2
2 5 3 1 4
2 3 1 4 5
2 5 4 3 1
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2
https://ideone.com/kyiCVN
language:
C++14 (gcc 8.3)
created:
10 days ago
visibility:
public

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