Cod sursa(job #984092)

Utilizator Impaler_009Mihai Nitu Impaler_009 Data 13 august 2013 15:11:50
Problema Stramosi Scor 100
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.64 kb
#include <fstream>
#include <cmath>
#define maxn 250001
#define maxlogn 18

using namespace std;

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

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

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

    logs[1]=0;
    for (int i=2; i<=n; ++i) logs[i] = logs[i>>1]+1;

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

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