Pagini recente » Cod sursa (job #1065033) | Cod sursa (job #1055370) | Cod sursa (job #3144541) | Cod sursa (job #2057577) | Cod sursa (job #2121221)
#include <iostream>
#include <fstream>
using namespace std;
ifstream in ("stramosi.in");
ofstream out ("stramosi.out");
int const nmax = 250000;
int const lgmax = 20;
int lg[5 + nmax];
int far[5 + lgmax][5 + nmax];
int n;
void computefar(){
for(int h = 1 ; h <= lgmax ;h++){
for(int i = 1 ; i <= n ;i++){
int node = far[h - 1][i];
far[h][i] = far[h - 1][node];
}
}
}
int query(int node ,int p){
while(0 < p){
int h = lg[p];
p -= (1 << h);
node = far[h][node];
}
return node;
}
int main()
{
int k;
in >> n >> k;
for(int i = 1 ; i <= n ;i++){
in >> far[0][i];
}
computefar();
for(int i = 1 ; i <= k ;i++){
int a , b;
in >> a >> b;
out << query(a , b) << '\n';
}
return 0;
}