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Cod sursa(job #189766)
#include<stdio.h>
int a[27][27], n, m;
long x[100][27];
FILE *f, *g;
void read()
{ char c, d, o, p;
int i;
fscanf(f, "%d%d%c", &n, &m, &o);
for(i=0; i<m; i++)
{ fscanf(f, "%c%c%c%c", &c, &o, &d, &p);
a[c-'a'][d-'a']=1;
a[d-'a'][c-'a']=1;
}
}
void solve()
{ int i, j, k;
long s;
for(i=0; i<26; i++)
x[1][i]=1;
for(i=2; i<=n; i++)
{ for(j=0; j<26; j++)
{ s=0;
for(k=0; k<26; k++)
{ if(a[k][j]!=1)
{ s+=x[i-1][k];
s%=104659;
}
}
x[i][j]=s;
}
}
s=0;
for(i=0; i<26; i++)
{ s+=x[n][i];
s%=104659;
}
fprintf(g, "%ld\n", s);
}
int main()
{ f=fopen("nrcuv.in", "r");
g=fopen("nrcuv.out", "w");
read();
solve();
fclose(f);
fclose(g);
return 0;
}