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Cod sursa(job #5491)
#include<stdio.h>
long a[1011][30];
int nu[30][38], n, m;
void solve()
{
for(int i=1; i<=26; ++i) a[1][i]=1;
for(int i=2; i<=n; ++i) {
for(int j=1; j<=26; ++j)
for(int k=1; k<=26; ++k) if( !nu[j][k]) a[i][j]+= a[i-1][k];
}
long suma=0;
for(int i=1; i<=26; ++i) suma+= a[n][i];
printf("%ld\n",suma%104659);
}
int main()
{
freopen("nrcuv.in","r",stdin);
scanf("%d %d\n",&n,&m);
char x, y;
for(int i=1; i<=m; ++i) {
scanf("%c %c\n",&x,&y);
nu[x-'a'+1][y-'a'+1]=1;
nu[y-'a'+1][x-'a'+1]=1;
}
freopen("nrcuv.out","w",stdout);
solve();
return 0;
}