Cod sursa(job #1630721)

Utilizator DenisONIcBanu Denis Andrei DenisONIc Data 5 martie 2016 10:55:34
Problema Stramosi Scor 80
Compilator cpp Status done
Runda Arhiva de probleme Marime 1.2 kb
#include <fstream>
#include <cstdio>
using namespace std;

ofstream g("stramosi.out");

long n,m,i,j,p,nr,q,dp[250005][30];


long stramos(long q,long p)
{
    long P=1,nr=0;

    long nod = q;
    for (int i = 0; (1<<i) <= p; i++) {
        if ((1<<i) & p) {
            nod = dp[nod][i];
        }
    }
    return nod;

   // while (true)
    {
//        while (p%2==0)
//        {
//            p=p/2;
//            ++nr;
//        }
//        if (q==0)
//            return 0;
//
//        if (p==1)
//            return dp[q][nr];
//        q=dp[q][nr];
//        p=p/2;
    }
}

int main()
{
    freopen("stramosi.in","r",stdin);
    scanf("%ld%ld",&n,&m);
    for (i=1;i<=n;i++)
        scanf("%ld",&dp[i][0]);

    p=1;
    while (p<<1<=n)
    {
        p<<=1;
        nr++;
    }

    p=0;

    long ok;
    for (j=1;j<=nr;j++)
    {
        ok=0;
        for (i=1;i<=n;i++)
        {
            dp[i][j]=dp[dp[i][j-1]][j-1];
            if (dp[i][j]!=0)
                ok=1;
        }
        if (ok==0)
            break;
    }
    for (i=1;i<=m;i++)
    {
        scanf("%ld%ld",&q,&p);
        g<<stramos(q,p)<<'\n';
    }
    return 0;
}