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Cod sursa(job #594190)
#include<stdio.h>
#include<string.h>
#define M 104659
#define N 2001
bool x[30][30];
int n,m,f[50],l[50];
char a,b;
int main() {
int i,sum=0,j,i2;
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",&a,&b);
a-='a';
b-='a';
x[(int) a][(int) b]=1; x[(int) b][(int) a]=1;
}
for(i=1;i<=26;i++)
l[i]=1;
for(i=2;i<=n;i++) {
for(j=1;j<=26;j++) {
f[j]=0;
for(i2=1;i2<=26;i2++)
if(!x[i2][j])
f[j]=(f[j]+l[i2])%M;
}
memcpy(l,f,sizeof(l));
}
for(i=1;i<=26;i++)
sum=(sum+l[i])%M;
printf("%d",sum);
return 0;
}