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Cod sursa(job #775102)
#include<fstream>
#define MOD 104659
#define NN 1001
using namespace std;
ofstream out("nrcuv.out");
bool v[30][30];
int a[NN][27],n,m,ans;
void read();
void dinamica();
void init();
int main()
{
read();
init();
dinamica();
out<<ans;
return 0;
}
void read()
{
ifstream in("nrcuv.in");
in>>n>>m;
for( char x,y ; m ;--m)
{
in>>x>>y;
v[x-'a'][y-'a']=v[y-'a'][x-'a']=true;
}
}
void init()
{
for(int i=1;i<=26;++i)
a[1][i]=1;
}
void dinamica()
{
for(int i=2;i<=n;++i)
for(int j=1;j<=26;++j)
for(int k=1;k<=26;++k)
if( v[j][k] == false)
a[i][j]= (a[i][j]+a[i-1][k]) % MOD;
for(int j=1;j<=26;++j)
ans= (ans + a[n][j] ) % MOD ;
}