Cod sursa(job #2635183)

Utilizator xXoctavianXxStanescu Matei Octavian xXoctavianXx Data 13 iulie 2020 16:27:49
Problema Lista lui Andrei Scor 20
Compilator cpp-64 Status done
Runda Arhiva de probleme Marime 0.84 kb
#include <bits/stdc++.h>

using namespace std;

ifstream fin("nrcuv.in");
ofstream fout("nrcuv.out");

const int mod=104659;
char frb[26][26];
char ca,cb;
long long d[2][26];
int n,m;

int main()
{
    fin>>n>>m;
    for(int i=0; i<m; i++)
    {
        fin>>ca>>cb;
        frb[ca-'a'][cb-'a']=1;
        frb[cb-'a'][ca-'a']=1;
    }
    for(int i=0; i<26; i++)
    {
        d[1][i]=1;
    }
    for(int i=2; i<=n; i++)
    {
        for(int j=0; j<26; j++)
        {
            for(int k=0; k<26; k++)
            {
                if(frb[k][j]==0) d[i%2][j]=(d[i%2][j]+d[(i-1)%2][k])%mod;
            }
            //cout<<d[i%2][j]<<" ";
        }
        //cout<<"\n";
    }
    long long sum=0;
    for(int i=0; i<26; i++)
    {
        sum=(sum+d[n%2][i])%mod;
    }
    fout<<sum%mod;
    return 0;
}