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Cod sursa(job #867604)
#include <fstream>
using namespace std;
ifstream f("stramosi.in");
ofstream g("stramosi.out");
int t[18][250001],logi[250001];
int main()
{
int n,m,i,j,x,y;
f>>n>>m;
for(i=1;i<=n;i++)
{
f>>t[0][i];
}
for(i=1; (1<<i)<=n; i++)
for(j=1;j<=n;j++)
t[i][j]=t[i-1][t[i-1][j]];
logi[1]=0;
for(i=2;i<=n;i++)
logi[i]=logi[i/2]+1;
for(i=1;i<=m;i++)
{
f>>x>>y;
while(y)
{
x=t[logi[y]][x];
y=y-(1<<logi[y]);
}
g<<x<<'\n';
}
}