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Cod sursa(job #6107)
#include <stdio.h>
#define fin "nrcuv.in"
#define fout "nrcuv.out"
char u[27][27], a, b;
int n, m, i, j, k;
long v[1001][26], s;
int main()
{
freopen(fin,"r",stdin);
freopen(fout,"w",stdout);
scanf("%i%i\n", &n, &m);
for(i=1;i<=m;++i)
{
scanf("%c %c\n", &a, &b);
u[a-96][b-96] = u[b-96][a-96] = 1;
}
for(i=1;i<=26;++i)
v[1][i]=1;
for(i=2;i<=n;++i)
for(j=1;j<=26;++j)
{
s=0;
for(k=1;k<=26;++k)
if(u[j][k]!=1)
{
s+=v[i-1][k];
s%=104659;
}
v[i][j]=s;
}
s=0;
for(i=1;i<=26;++i)
{
s+=v[n][i];
s%=104659;
}
printf("%ld\n",s);
return 0;
}