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Cod sursa(job #312595)
#include<fstream.h>
ifstream f("stramosi.in");
ofstream g("stramosi.out");
int n,m,a[18][250001];
int main()
{f>>n>>m;
int i=1,j;
for(;i<=n;++i)
f>>a[0][i];
for(j=1;j<18;++j)
for(i=1;i<=n;++i)
a[j][i]=a[j-1][a[j-1][i]];
for(;m;--m)
{int q,p,x=1,i=0;
f>>q>>p;
while(x<p)
{x<<=1;++i;}
while(x&&p&&q)
{if(x<=p)
{q=a[i][q];
p-=x;}
x>>=1;
--i;}
g<<q<<'\n';}
return 0;
}