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Cod sursa(job #604843)
#include<stdio.h>
#include<malloc.h>
#define MaxN 250100
#define MaxlgN 19
int T[MaxN];
int viz[MaxN];
int B[MaxN][MaxlgN];
int Doi[21] = {1,2,4,8,16,32,64,128,256,512,1024,2048,4096,8192,16384,32768,65536,131072,262144};
int N;
int M;
int a;
int b;
void citire(FILE *f)
{
int a;
fscanf(f,"%d %d",&N,&M);
for(int i=1;i<=N;i++)
fscanf(f,"%d ",&T[i]);
}
void CompletGraph(void)
{
for(int i=1;i<=N;i++)
{
B[i][1] = T[i];
for(int j=2;j<=18;j++)
B[i][j] = B[B[i][j-1]][j-1];
}
}
int LogDoiDinK(int &k)
{
int nr;
for(nr=0;Doi[nr]<=k;++nr);
k -= Doi[--nr];
return nr+1;
}
int FindStra(int a,int k)
{
while(k)
{
int nr = LogDoiDinK(k);
a = B[a][nr];
}
return a;
}
int main()
{
FILE *f = fopen("stramosi.in","r");
FILE *g = fopen("stramosi.out","w");
citire(f);
CompletGraph();
for(int i=1;i<=M;i++)
{
fscanf(f,"%d %d",&a,&b);
fprintf(g,"%d\n",FindStra(a,b));
}
fclose(g);
fclose(f);
return 0;
}