Cod sursa(job #640812)

Utilizator mlupseLupse-Turpan Mircea mlupse Data 26 noiembrie 2011 15:41:30
Problema Stramosi Scor 0
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.95 kb
using namespace std;
#define NMax 250005
#define LgMax 19
#include <cstdio>
#define DIM 8192
#define maxn 300001


int N,M,A[LgMax][NMax],L[NMax];
char ax[DIM+16];
int pz;

inline void cit(int &x)
{
	x=0;
	while(ax[pz]<'0' || ax[pz]>'9')
		if(++pz==DIM)fread(ax, 1, DIM, stdin), pz=0;
	while(ax[pz]>='0' && ax[pz]<='9')
	{
		x=x*10+ax[pz]-'0';
		if(++pz==DIM)fread(ax,1, DIM, stdin),pz=0;
	}
}

void BuildLog2 ()
{
    for (int i=2; i<=250000; ++i)
        L[i]=L[i/2]+1;
}

void Build()
{
    BuildLog2 ();
    for (int i=1; i<=L[N]; ++i)
        for (int j=1; j<=N; ++j)
            A[i][j]=A[i-1][A[i-1][j]];
}

int main()
{
	int X, Y;
	freopen("stramosi.in","r",stdin);
	freopen("stramosi.out","w",stdout);
    cit(N);cit(M);
    for (int i=1; i<=N; ++i)
          cit(A[0][i]);
  
    Build();
    for (; M>0; --M)
    {
        cit(X); cit(K);
		while (K>0)
    {
        X=A[L[K]][X];
        K-=(1<<L[K]);
    }
        printf("%d\n",X);
    }
    return 0;
}