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Cod sursa(job #371956)
#include <iostream>
#include <math.h>
using namespace std;
int main() {
FILE *f1=fopen("stramosi.in", "r"), *f2=fopen("stramosi.out", "w");
int stra[20][250001], n, m, k, p, i, j;
fscanf(f1, "%d %d", &n, &m);
for(i=1; i<=n; i++) {
fscanf(f1, "%d", &stra[0][i]);
}
for(j=1; j<=19; j++) {
for(i=1; i<=n; i++) {
if(stra[j-1][i]) {
stra[j][i]=stra[j-1][stra[j-1][i]];
}
else {
stra[j][i]=0;
}
}
}
for(i=1; i<=m; i++) {
fscanf(f1, "%d %d", &p, &k);
j=0;
while(k && p) {
if(k%2) {
p=stra[j][p];
}
j++; k=k>>1;
}
fprintf(f2, "%d\n", p);
}
fclose(f1); fclose(f2);
return 0;
}