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>
#define pb push_back
#define sz(x) (int)x.size()
#define fi first
#define se second
using namespace std ;
const int MAXN = 1e6+6 ;
int state , cnt , par[MAXN][20];
// string ans[MAXN] ;
vector<pair<int,int>> queries;
void Init() {
}
// void new_state(int s){
// for(int i=1;i<19;i++){
// par[s][i] = par[par[s][i-1]][i-1];
// }
// cerr << "current answer: " << ans[state] << endl;
// }
// int kth_anc(int u,int k){
// for(int i = 18 ; i >= 0 ; i-- ){
// if(k&(1<<i)){
// k-=(1<<i);
// u = par[u][i] ;
// }
// }
// return u;
// }
void TypeLetter(char L) {
queries.pb({0,(L-'a')});
//new_state(state);
}
void UndoCommands(int U) {
queries.pb({1,U});
}
bool done = 0 ;
string res ;
void RES(){
done = 1;
int nxt = -1 , del = 0 ;
string ans ="";
for(int i = sz(queries)-1 ; i >= 0 ; i-- ){
if( !del ){
if( queries[i].fi == 0 ){
ans.pb((char)(queries[i].se+'a'));
}else{
nxt = i - queries[i].se ;
del = 1 ;
}
}
if(del&&nxt==i)del = 0 ;
}
reverse(ans.begin(),ans.end());
res = ans;
}
char GetLetter(int P) {
if( !done )RES();
return res[P];
}
// int main() {
// Init();
// int cmd_num;
// bool tmp = scanf("%d", &cmd_num);
// assert(tmp == 1);
// int i;
// for (i = 0; i < cmd_num; i++) {
// char cmd;
// tmp = scanf(" %c", &cmd);
// assert(tmp == 1);
// if (cmd == 'T') {
// char letter;
// tmp = scanf(" %c", &letter);
// assert(tmp == 1);
// TypeLetter(letter);
// }
// else if (cmd == 'U') {
// int number;
// tmp = scanf("%d", &number);
// assert(tmp == 1);
// UndoCommands(number);
// }
// else if (cmd == 'P') {
// int index;
// char letter;
// tmp = scanf("%d", &index);
// assert(tmp == 1);
// letter = GetLetter(index);
// printf("%c\n", letter);
// }
// }
// puts("Let's test for cheating!!");
// return 0;
// }
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