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Cod sursa(job #770190)
#include <cstdio>
#include <cmath>
using namespace std;
const int N = 250005;
int n, m, dim, x, y, sol;
int tata[N];
int stramosi[N][18];
int main()
{
freopen ("stramosi.in", "r", stdin);
freopen ("stramosi.out", "w", stdout);
scanf("%d %d", &n, &m);
for(int i = 1; i <= n; ++i)
scanf("%d", &tata[i]);
for(int i = 1; i <= n; ++i)
stramosi[i][0] = tata[i];
dim = ceil(log2(n));
for(int i = 1; i <= n; ++i)
for(int j = 1; j <= dim; ++j)
stramosi[i][j] = stramosi[stramosi[i][j - 1]][j - 1];
for(int i = 1; i <= m; ++i) {
scanf("%d %d", &x, &y);
int k = 0;
while((1 << (k + 1)) < y)
++k;
sol = stramosi[x][k];
for(int j = 1; j <= (y - (1 << k)) ; ++j)
sol = tata[sol];
printf("%d\n", sol);
}
return 0;
}