This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
char last;
#define rep(i,a,b) for (int i = (a); i <= (b); i++)
#define lli long long int
#define debug(a) //cout << #a << " = " << a << endl
struct x{
char letra;
lli padre;
lli nivel;
lli jump;
};
lli p,act,cont = 1;
x instruccion[1000002];
lli salto[1000002];
void Init() {
instruccion[0].nivel = 0;
instruccion[0].padre = 0;
instruccion[0].letra = 0;
// rep(i, 0, 1000001) rep(j, 0, 21) binaryUp[i][j] = 0;
}
void TypeLetter(char L) {
instruccion[cont].letra = L;
instruccion[cont].padre = cont-1;
instruccion[cont].nivel = instruccion[ instruccion[cont].padre ].nivel + 1;
p = cont - 1;
if (instruccion[cont].nivel > 1) {
if (instruccion[p].jump > 0 && instruccion[instruccion[cont].padre].jump == instruccion[salto[instruccion[cont].padre]].jump) {
salto[cont] = salto[salto[instruccion[cont].padre]];
instruccion[cont].jump = instruccion[instruccion[cont].padre].jump*2 + 1;
}
else {
salto[cont] = instruccion[cont].padre;
instruccion[cont].jump = 1;
}
}
cont++;
}
void UndoCommands(int U) {
instruccion[cont] = instruccion[cont - U - 1];
act = 0;
salto[cont] = salto[cont - U - 1];
cont++;
}
char GetLetter(int P) {
act = cont-1;
p = instruccion[act].nivel;
P++;
while (P < p) {
if (p - instruccion[act].jump >= P) {
p -= instruccion[act].jump;
act = salto[act];
}
else {
p--;
act = instruccion[act].padre;
}
}
return instruccion[act].letra;
}
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