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Cod sursa(job #926888)
#include<stdio.h>
int N,M,v[26][26],x,y,legal[26],nr[26],s;
char a,b,c,d;
int main()
{
freopen("nrcuv.in","r",stdin);
freopen("nrcuv.out","w",stdout);
scanf("%d%d",&N,&M);
for(int i=1;i<=M;++i)
{
scanf("%c%c%c%c",&a,&b,&c,&d);
x=b-'a';
y=d-'a';
v[x][y]=1;
v[y][x]=1;
//printf("%d %d\n",x,y);
}
for(int i=0;i<=25;++i)
{
legal[i]=26;
for(int j=0;j<=25;++j)
if(v[i][j]==1)
--legal[i];
}
for(int i=0;i<=25;++i)
nr[i]=1;
for(int i=2;i<=N;++i)
{
for(int j=0;j<=25;++j)
{
nr[j]=(nr[j]*legal[j])%104659;
}
}
for(int i=0;i<=25;++i)
s=(s+nr[i])%104659;
printf("%d",s);
return 0;
}