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Cod sursa(job #794312)
#include<stdio.h>
#define MOD 104659
FILE *fin=fopen("nrcuv.in","r");
FILE *fout=fopen("nrcuv.out","w");
int cuv[2][30],m,n,i,j,pas,s;
int reg[30][30];
char a,b;
int main(){
fscanf(fin,"%d %d\n",&n,&m);
for(i = 1; i<=m; i++){
fscanf(fin,"%c %c \n",&a,&b);
reg[a-'a'][b-'a']=1;
reg[b-'a'][a-'a']=1;
}
for(i = 0; i<='z'-'a'; i++){
cuv[1][i]=1;
}
for(pas = 2; pas<=n; pas++){
for(i = 0; i<='z'-'a'; i++){
s=0;
for(j=0; j<='z'-'a'; j++){
if(reg[i][j]==0){
s+=cuv[ (pas-1)%2][j];
}
}
cuv[pas%2][i]=s%MOD;
}
}
s=0;
for(i=0;i<='z'-'a';i++){
s+=cuv[n%2][i];
}
s%=MOD;
fprintf(fout,"%d",s);
return 0;
}