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Cod sursa(job #865964)
#include <fstream>
#include <vector>
using namespace std;
#define NMAX 1005
#define MOD 104659
ifstream fin("nrcuv.in");
ofstream fout("nrcuv.out");
int d[NMAX][27],n;
bool ma[27][27];
vector <int> v[27];
void read()
{
int m,x,y;
char a,b;
fin>>n>>m;
for(int i=0;i<m;i++)
{
fin>>a>>b;
x=a-96;
y=b-96;
if(ma[x][y]==true)
continue;
ma[x][y]=ma[y][x]=true;
v[x].push_back(y);
v[y].push_back(x);
}
}
int main()
{
read();
int i,j,k;
for(i=1;i<=26;i++)
d[1][i]=1;
for(k=2;k<=n;k++)
{
for(i=1;i<=26;i++)
{
for(j=1;j<=26;j++)
{
if(ma[i][j]==true)
continue;
d[k][i]+=d[k-1][j];
if(d[k][i]>=MOD)
d[k][i]-=MOD;
}
}
}
for(i=1;i<=26;i++)
d[0][0]+=d[n][i];
fout<<d[0][0]%MOD;
}