Cod sursa(job #2505200)

Utilizator HumikoPostu Alexandru Humiko Data 6 decembrie 2019 14:43:01
Problema Stramosi Scor 100
Compilator cpp-64 Status done
Runda Arhiva de probleme Marime 1.08 kb
#include <algorithm>
#include <stack>
#include <queue>
#include <deque>
#include <vector>
#include <string>
#include <set>
#include <map>
#include <cstring>

using namespace std;

//#include <iostream>
#include <fstream>

//ifstream cin ("input.in");
//ofstream cout ("output.out");

ifstream cin ("stramosi.in");
ofstream cout ("stramosi.out");

static const int NMAX = 25e4+5;

int n, m;
int logar[NMAX];
int dp[20][NMAX];

int search (int member, int degree) {
	for ( int i = logar[n]; i >= 0; --i ) {
		if ( (1<<i) <= degree ) {
			member = dp[i][member];
			degree -= (1<<i);
		}
	}

	return member;
}

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0); cout.tie(0);

	for ( int i = 2; i <= NMAX-5; ++i ) {
		logar[i] = logar[i/2]+1;
	}

	cin>>n>>m;
	for ( int i = 1; i <= n; ++i ) {
		int x;
		cin>>x;
		dp[0][i] = x;
	}

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

	for ( int i = 1; i <= m; ++i ) {
		int q, p;
		cin>>q>>p;

		cout<<search(q, p)<<'\n';
	}

}