Pagini recente » Cod sursa (job #2786206) | Cod sursa (job #1503113) | Cod sursa (job #1734869) | Cod sursa (job #1259652) | Cod sursa (job #2538969)
#include <bits/stdc++.h>
using namespace std;
ifstream in("stramosi.in");
ofstream out("stramosi.out");
int n,m,t[250100],p,q,x,sum;
int s[20][250100];
int lg(int x)
{
int ans=0;
while(x/2>=1)
{
x/=2;
ans++;
}
return ans;
}
int find(int x,int t)
{
int p=x;
int sum=0;
int nr=lg(t);
while(sum<t)
{
if(sum+(1<<nr)>t) nr--;
else
{
p=s[nr][p];
if(p==0) return 0;
sum+=(1<<nr);
}
}
return p;
}
int main()
{
in>>n>>m;
for(int i=1;i<=n;i++)
{
in>>x;
t[i]=x;
}
for(int i=1;i<=n;i++) s[0][i]=t[i];
for(int i=1;i<20;i++)
for(int j=1;j<=n;j++)
s[i][j]=s[i-1][s[i-1][j]];
while(m--)
{
in>>q>>p;
out<<find(q,p)<<'\n';
}
return 0;
}