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Cod sursa(job #886851)
#include<fstream>
using namespace std;
ifstream f("nrcuv.in");
ofstream g("nrcuv.out");
int i,s,j,k,m,n,x[1001][28],a[28][28];
char lit1,lit2;
int main()
{
f>>n>>m;
for(i=1;i<=m;++i)
{
f>>lit1>>lit2;
a[lit1-'a'][lit2-'a']=a[lit2-'a'][lit1-'a']=1;
}
for(i=1;i<=26;++i) x[1][i]=1;
for(i=2;i<=n;++i)
for(j=1;j<=26;++j)
for(k=1;k<=26;++k)
if(!a[j][k]) x[i][j]=(x[i][j]+x[i-1][k])%104659;
for(i=1;i<=26;++i){ s+=x[n][i]; s%=104659;}
g<<s<<'\n';
return 0;
}