Cod sursa(job #1235616)

Utilizator Vally77FMI Calinescu Valentin Gelu Vally77 Data 30 septembrie 2014 03:19:16
Problema Stramosi Scor 90
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.86 kb
#include <iostream>
#include <fstream>
using namespace std;
ifstream ka("stramosi.in");
ofstream ki("stramosi.out");

const int N_MAX = 250000;
const int LOG_MAX = 19;

int stramos[N_MAX + 1][LOG_MAX];

int srch(int p, int q)
{
    if(p == 0)
        return q;
    for(int i = 18; i >= 0; i--)
        if(p & (1 << i))
        {
            return srch(p - (1 << i), stramos[q][i]);
        }
}

string s;
int n, m, p, q, k;
int main()
{
    ka >> n >> m;
    for(int i = 1; i <= n; i++)
        ka >> stramos[i][0];
    int log = 0;
    for(int i = 18; i >= 0; i--)
        if(n & (1 << i))
        {
            log = i;
            break;
        }
    for(int j = 1; j <= log; j++)
        for(int i = 1; i <= n; i++)
            stramos[i][j] = stramos[stramos[i][j-1]][j-1];
    for(int i = 1; i <= m; i++)
    {
        ka >> q >> p;
        ki << srch(p, q) << '\n';
    }
}