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Cod sursa(job #315753)
#include<stdio.h>
long n,m,i,f['z'+5]['z'+5],ss,s[1005]['z'+5];
char a1,a2;
int main()
{
freopen("nrcuv.in","r",stdin);
freopen("nrcuv.out","w",stdout);
scanf("%ld%ld\n",&n,&m);
for(i=1;i<=m;++i)
{scanf("%c %c\n",&a1,&a2);
f[a1][a2]=1;
f[a2][a1]=1;}
for(a1='a';a1<='z';++a1)s[1][a1]=1;
for(i=1;i<n;++i)
for(a1='a';a1<='z';++a1)
for(a2='a';a2<='z';++a2)
if(!f[a1][a2])s[i+1][a2]=(s[i+1][a2]+s[i][a1])%104659;
for(a1='a';a1<='z';++a1)ss=(ss+s[n][a1])%104659;
printf("%ld\n",ss);
return 0;
}