Cod sursa(job #984088)

Utilizator Impaler_009Mihai Nitu Impaler_009 Data 13 august 2013 15:03:50
Problema Stramosi Scor 90
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.63 kb
#include <fstream>
#include <cmath>
#define maxn 250001
#define maxlogn 18

using namespace std;

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

int t[maxn][maxlogn];
int n,m,Q,P;

int main()
{
    fin>>n>>m;
    for (int i=1; i<=n; ++i) fin>>t[i][0];

    int log = log2(n);

    for (int j=1; j<=log; ++j)
    {
        for (int i=1; i<=n; ++i)
        {
            t[i][j] = t[t[i][j-1]][j-1];
        }
    }

    for (int i=1; i<=m; ++i)
    {
        fin>>Q>>P;
        log=log2(P);
        for (int j=log; j>=0; --j)
            if ((1<<j)&P) Q = t[Q][j];
        fout<<Q<<"\n";
    }
}