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Cod sursa(job #522115)
#include<algorithm>
#include<assert.h>
using namespace std;
#define N_MAX 250002
int str[20][N_MAX];
int n,m,x,y;
int i,adanc;
int main()
{
freopen("stramosi.in","r",stdin);
freopen("stramosi.out","w",stdout);
scanf("%d%d",&n,&m);
for(i=1;i<=n;i++)
scanf("%d",&str[0][i]);
adanc=1;
for(int ok=1;ok;adanc++)
{
ok=0;
for(i=1;i<=n;i++)
{
str[adanc][i]=str[adanc-1][str[adanc-1][i]];
if(str[adanc][i])
ok=1;
}
}
for(i=1;i<=m;i++)
{
scanf("%d%d",&x,&y);
adanc=0;
while(y&&x)
{
for(adanc=1;(adanc<<1)<=y;adanc++);
adanc--;
assert(adanc<20);
x=str[adanc][x];
y=y-(1<<adanc);
}
printf("%d\n",x);
}
return 0;
}