Cod sursa(job #1385745)

Utilizator alexpascadiAlexandru Pascadi alexpascadi Data 12 martie 2015 12:09:27
Problema Stramosi Scor 30
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.89 kb
#include <stdio.h>

using namespace std;

const int N=250002;
const int LOG=19;
int t[N];
int d[N][LOG];

int main()
{
    FILE *in=fopen("stramosi.in","r");
    FILE *out=fopen("stramosi.out","w");
    int i,j,n,m,q,p,pow;

    fscanf(in,"%d%d",&n,&m);
    for(i=1;i<=n;i++)
        fscanf(in,"%d",&d[i][0]);

    for(j=1;(1<<j)<=n;j++)
    {
        for(i=1;i<=n;i++)
        {
            d[i][j]=d[d[i][j-1]][j-1];
            //fprintf(out,"%d ",d[i][j]);
        }
        //fprintf(out,"\n");
    }

    for(i=1;i<=m;i++)
    {
        fscanf(in,"%d%d",&q,&p);
        if((1<<p)>n)
        {
            fprintf(out,"0\n");
            continue;
        }
        pow=18;
        while(pow>=0)
        {
            if((1<<pow)<=p)
            {
                p-=(1<<pow);
                q=d[q][pow];
            }
            pow--;
        }
        fprintf(out,"%d\n",q);
    }

    return 0;
}