#include<bits/stdc++.h>
using namespace std;
#define MAX 100
#define ifi 1000*10000+4
int n,k;
int c[MAX][MAX];//ma tran goc
int x[MAX];//bang thu
int f,bestf=ifi;//best path
int cmin=ifi;
int Free[MAX];//ma tran kiem tra da di qua hay chua
set<int> s;
void input(){
int i,j;
cin>>n>>k;
for(i=0;i<=2*n;i++){
for(j=0;j<=2*n;j++)
{ cin>>c[i][j];
if(i!=j) cmin=min(cmin,c[i][j]);
}
}
for(i=1;i<=2*n;i++){
Free[i]=1;
}
Free[0]=0;
x[0]=0;
f=0;
}//bai toan tro thanh bai tsp vs 2n diem va kthuc kkhi ko con khach
void solve(int i){
for(int j=1;j<=2*n;j++){
if(Free[j]){
x[i]=j;
Free[j]=0;
if(j>=1 && j<=n && s.size()<k && s.find(j)==s.end() ) s.insert(j);// neu xe con cho thi don khach len
if(j>n){ // gap dung cho thi tra khach
auto tmp = s.find(j-n);
if(tmp!=s.end()) s.erase(tmp);
}
f+=c[x[i-1]][x[i]];//tu vi tri trc do den vi tri j
if(i==2*n && s.size()==0) {
if(f + c[x[2*n]][0] < bestf) bestf = f + c[x[2*n]][0];
}
else{
if(f + (2*n-i+1)*cmin < bestf ) solve(i+1); //khi den vi tri i thi con 2n-i+1 lan di chuyen nua
}
f-=c[x[i-1]][x[i]];//tro lai ban dau
if(j>=1 && j<=n && s.find(j)!=s.end()) s.erase(s.find(j)); //neu da dua len thi tra lai
if(j>n && s.find(j-n)==s.end() && s.size()<k ) s.insert(j-n);//neu da tra thi dua len
Free[j]=1;
}
}
}
int main(){
ios::sync_with_stdio(0);
cin.tie(0);
input();
solve(1);
cout<<bestf;
}
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