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#include <iostream>
#include <fstream>
#define infinit 20000000
using namespace std;
ifstream fin("hamilton.in");
ofstream fout("hamilton.out");
int i,j,n,m,cost,nodant,minn,a[20][20],d[262160][20],k,x,y;
int main()
{
fin>>n>>m;
for(i=0;i<n;i++)
{
for(j=0;j<n;j++)
{
if(i==j)
{
a[i][j]=0;
}
else
{
a[i][j]=infinit;
}
}
}
int minn=infinit;
for(i=1;i<=m;i++)
{
fin>>x>>y>>cost;
a[x][y]=cost;
}
for(i=3;i<1<<n;i++)
{
for(j=0;j<n;j++)
{
d[i][j]=infinit;
}
}
for(i=3;i<(1<<n);i=i+2)
{
for(j=0;j<n;j++)
{
// d[i][j]=infinit;
if(((1<<j)&i)!=0)
{
nodant=i-(1<<j);
for(k=0;k<n;k++)
{
if((nodant&(1<<k))!=0&&a[k][j]!=0)
{
d[i][j]=min(d[i][j],d[nodant][k]+a[k][j]);
}
}
}
}
}
nodant=(1<<n)-1;
for(i=0;i<n;i++)
{
if(a[i][0]!=0&&d[nodant][i]!=infinit)
{
if(minn>d[nodant][i]+a[i][0])
{
minn=d[nodant][i]+a[i][0];
}
}
}
if(minn!=infinit)
{
fout<<minn;
}
else
{
fout<<"Nu exista solutie";
}
return 0;
}