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Cod sursa(job #795718)
#include<fstream.h>
ifstream f("nrcuv.in");
ofstream g("nrcuv.out");
bool nu[30][30];
long nrc[1001][30],l,i,n,m,j,sum=0;
char l1,l2;
int main()
{
f>>n>>m;
for(i=0;i<m;i++)
{
f>>l1>>l2;
nu[l1-'a'][l2-'a']=1;
nu[l2-'a'][l1-'a']=1;
}
for(i=0;i<26;i++)
nrc[0][i]=1;
for(l=0;l<n;l++)
{
for(i=0;i<26;i++)
for(j=0;j<26;j++)
nrc[l+1][j]+=(nrc[l][i]*(1-nu[i][j]))%104659;
}
n--;
for(i=0;i<26;i++)
sum=(sum+(nrc[n][i]))%104659;
g<<sum;
return 0;
}