Pagini recente » Cod sursa (job #2317549) | Cod sursa (job #1085459) | Cod sursa (job #1848046) | Cod sursa (job #2964992) | Cod sursa (job #2047418)
#include <fstream>
#include <cmath>
using namespace std;
ifstream fin("stramosi.in");
ofstream fout("stramosi.out");
const int NMax = 250000;
int N,M;
int Ancestor[21][NMax + 5];
void Read()
{
fin >> N >> M;
for(int i = 1; i <= N; ++i)
fin >> Ancestor[0][i];
}
void PreCalculate()
{
for(int i = 1; (1<<i) <= N ; ++i)
for(int j = 1; j <= N; ++j)
Ancestor[i][j] = Ancestor[i-1][Ancestor[i-1][j]];
}
int FindAncestor(int Q, int P)
{
int K;
while(P)
{
K = log2(P);
Q = Ancestor[K][Q];
P = P - (1<<K);
}
return Q;
}
void SolveandPrint()
{
while(M--)
{
int Q,P;
fin >> Q >> P;
fout << FindAncestor(Q,P) << "\n";
}
}
int main()
{
Read();
PreCalculate();
SolveandPrint();
return 0;
}