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Cod sursa(job #791845)
#include<cstdio>
#define BM 1005
#define mod 104659
int ma[30][BM],pot[30][30],n,m;
int main (){
int i,j,k,s=0;
char a,b;
freopen("nrcuv.in","r",stdin);
freopen("nrcuv.out","w",stdout);
scanf("%d %d",&n,&m);
for(i=1;i<=m;++i){
scanf("\n%c %c",&a,&b);
pot[a-'a'][b-'a']=1;
pot[b-'a'][a-'a']=1;
}
for(i=0;i<26;++i)ma[i][1]=1;
for(i=0;i<26;++i){
for(j=1;j<=n;++j){
for(k=0;k<26;++k){
if(pot[i][k]==0){
ma[i][j]+=ma[k][j-1];
if(ma[i][j]>=mod)ma[i][j]-=mod;
}
}
}
}
for(i=0;i<26;++i){
s+=ma[i][n];
if(s>=mod)s-=mod;
}
printf("%d",s);
return 0;
}