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Cod sursa(job #998932)
#include <fstream>
using namespace std;
int n,tata[250005];
int din[18][250005];
int log2[250005];
inline void calc_log()
{
int i=2;
log2[1]=0;
for(;i<=n;i++)
log2[i]=log2[i/2]+1;
}
void precalc()
{
int i,j,lg=log2[n];
for(i=1;i<=n;i++)
din[0][i]=tata[i];
for(i=1;i<=lg;i++)
for(j=1;j<=n;j++)
din[i][j]=din[i-1][din[i-1][j]];
}
#define lsb(x) (x&(-x))
int main()
{
ifstream cin("stramosi.in");
ofstream cout("stramosi.out");
int i,m=0,a,l,rasp,k;
cin>>n>>m;
for(i=1;i<=n;i++)
cin>>tata[i];
calc_log();
precalc();
for(i=0;i<m;i++)
{
cin>>a>>l;
rasp=a;
while(l)
{
k=log2[lsb(l)];
rasp=din[k][rasp];
l-=lsb(l);
}
cout<<rasp<<'\n';
}
cin.close();
cout.close();
return 0;
}