Cod sursa(job #1049083)

Utilizator Catalina_BrinzaBrinza Catalina Catalina_Brinza Data 6 decembrie 2013 21:08:36
Problema Stramosi Scor 0
Compilator cpp Status done
Runda Arhiva de probleme Marime 1.1 kb
//
//  main.cpp
//  stramosi
//
//  Created by Catalina Brinza on 11/26/13.
//  Copyright (c) 2013 Catalina Brinza. All rights reserved.
//

#include <fstream>

#include <math.h>
#define MAX_N  250001

using namespace std;
ifstream f("stramosi.in");
ofstream g("stramosi.out");
int main()
{int n,m,i,x,l,q,p;
  int a[20][MAX_N];
    bool viz[MAX_N];
    f>>n>>m;
    for (i=1;i<=n;++i)
    {
        f>>a[0][i];
        viz[i]=false;
        if (a[0][i]==0) viz[i]=true;
    }
    bool ok=true;l=1;
    while (ok)
    {
        i=1;
        ok=false;
        while (i<=n)
        {
            if (!viz[i])
            {
                ok=true;
                a[l][i]=a[l-1][a[l-1][i]];
                if (a[l][i]==0) viz[i]=true;
            }
            ++i;
        }
        ++l;
    }


    for (i=0;i<m;++i)
    {  f>>q>>p;
        while (p!=0)
        {
            l=log2(p);
            if (a[0][q]==0)
            {
                q=0; break;
            }
             q=a[l][q];
            if (q==0)break;
            p-=(1<<l);
        }
        g<<q<<"\n";
    }
    f.close();
    g.close();
    return 0;
}