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Cod sursa(job #344573)
#include <stdio.h>
#define Nmax 1005
#define sigma 30
#define ll long long
#define M 104659
int v[sigma][sigma];
int a[Nmax][sigma];
int n,m,i,j,k;
ll sum,sum2;
char c1,c2;
int main(){
freopen("nrcuv.in","r",stdin);
freopen("nrcuv.out","w",stdout);
scanf("%d%d\n",&n,&m);
for(i=1;i<=m;++i){
scanf("%c %c\n",&c1,&c2);
v[c1-'a'][c2-'a']=1;
v[c2-'a'][c1-'a']=1;
}
for(i=0;i<26;++i) a[1][i]=1, ++sum;
for(i=2;i<=n;++i){
for(j=0;j<26;++j){
a[i][j]=sum;
for(k=0;k<26;k++)
if(v[j][k]) a[i][j] -= a[1][k];
sum2 = (sum2+a[i][j])%M;
}
sum=sum2; sum2=0;
}
printf("%lld\n",sum);
fclose(stdin); fclose(stdout);
}