Cod sursa(job #1068802)

Utilizator Catalina_BrinzaBrinza Catalina Catalina_Brinza Data 28 decembrie 2013 19:20:03
Problema Stramosi Scor 100
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.63 kb
#include <fstream>
int a[20][250001];
using namespace std;
ifstream f("stramosi.in");
ofstream g("stramosi.out");
int log2(int x)
{int q=1,n=0;
    while (q<=x)
    {
        q=q<<1;
        n++;
    }
    return n-1;
}


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