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Cod sursa(job #467193)
#include <stdio.h>
#define nmax 250001
int a[nmax][21],n,m,p,q,i,j,pow, val;
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", &a[i][0]);
for(i=1;i<=n;i++)
for(j=1;j<17;j++)
a[i][j]=a[a[i][j-1]][j-1];
for(i=1;i<=m;i++)
{
scanf("%d %d", &p, &q);
while(q>0)
{
pow=0;
val=1;
while(2*val<=q)
{val*=2;pow++;}
q-=val;
p=a[p][pow];
}
printf("%d\n", p);
}
return 0;
}