#include <bits/stdc++.h>
#define ll long long
#define pb emplace_back
#define mp make_pair
#define fi first
#define se second
using namespace std;
const int N = int(1e6) + 1;
const int logN = 21;
int cur, p[N][logN], ver[N], len[N];
char c[N];
void Init() {cur = 0;}
void TypeLetter(char ch) {
ver[cur] = cur, c[cur] = ch;
p[cur][0] = cur? ver[cur - 1]: cur;
len[cur] = len[p[cur][0]] + 1;
for(int i = 1; i < logN; ++i) p[cur][i] = p[p[cur][i - 1]][i - 1];
++cur;
}
void UndoCommands(int k) {
ver[cur] = ver[cur - k - 1];
++cur;
}
char GetLetter(int k) {
int pos = ver[cur - 1];
k = len[pos] - k - 1;
for(int i = logN - 1; i >= 0; --i)
if((k >> i) & 1) pos = p[pos][i];
return c[pos];
}
//int main()
//{
// ios_base::sync_with_stdio(0);
// cin.tie(0), cout.tie(0);
// if(fopen("test.inp", "r")) {
// freopen("test.inp", "r", stdin);
// freopen("test.out", "w", stdout);
// }
// Init();
// TypeLetter('a');// a
// TypeLetter('b');// ab
// cout << GetLetter(1) << '\n';// b ab
// TypeLetter('d');// abd
// UndoCommands(2);// a
// UndoCommands(1);// abd
// cout << GetLetter(2) << '\n';// d abd
// TypeLetter('e');// abde
// UndoCommands(1);// abd
// UndoCommands(5);// ab
// TypeLetter('c');// abc
// cout << GetLetter(2) << '\n';// c abc
// UndoCommands(2);// abd
// cout << GetLetter(2) << '\n';// d abd
//}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
2 ms |
376 KB |
Output is correct |
2 |
Correct |
2 ms |
376 KB |
Output is correct |
3 |
Correct |
2 ms |
376 KB |
Output is correct |
4 |
Correct |
2 ms |
376 KB |
Output is correct |
5 |
Correct |
2 ms |
376 KB |
Output is correct |
6 |
Correct |
2 ms |
376 KB |
Output is correct |
7 |
Correct |
2 ms |
376 KB |
Output is correct |
8 |
Correct |
2 ms |
376 KB |
Output is correct |
9 |
Correct |
2 ms |
376 KB |
Output is correct |
10 |
Correct |
2 ms |
376 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
2 ms |
376 KB |
Output is correct |
2 |
Correct |
2 ms |
376 KB |
Output is correct |
3 |
Correct |
2 ms |
504 KB |
Output is correct |
4 |
Correct |
2 ms |
376 KB |
Output is correct |
5 |
Correct |
2 ms |
376 KB |
Output is correct |
6 |
Correct |
2 ms |
376 KB |
Output is correct |
7 |
Correct |
2 ms |
504 KB |
Output is correct |
8 |
Correct |
2 ms |
376 KB |
Output is correct |
9 |
Correct |
2 ms |
376 KB |
Output is correct |
10 |
Correct |
2 ms |
376 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
3 ms |
504 KB |
Output is correct |
2 |
Correct |
3 ms |
632 KB |
Output is correct |
3 |
Correct |
3 ms |
760 KB |
Output is correct |
4 |
Correct |
3 ms |
760 KB |
Output is correct |
5 |
Correct |
3 ms |
760 KB |
Output is correct |
6 |
Correct |
4 ms |
764 KB |
Output is correct |
7 |
Correct |
4 ms |
760 KB |
Output is correct |
8 |
Correct |
3 ms |
760 KB |
Output is correct |
9 |
Correct |
4 ms |
760 KB |
Output is correct |
10 |
Correct |
4 ms |
760 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
515 ms |
67192 KB |
Output is correct |
2 |
Correct |
560 ms |
83952 KB |
Output is correct |
3 |
Correct |
411 ms |
84088 KB |
Output is correct |
4 |
Correct |
396 ms |
89336 KB |
Output is correct |
5 |
Correct |
495 ms |
78200 KB |
Output is correct |
6 |
Correct |
451 ms |
90876 KB |
Output is correct |
7 |
Correct |
513 ms |
80120 KB |
Output is correct |
8 |
Correct |
515 ms |
88776 KB |
Output is correct |
9 |
Correct |
611 ms |
84840 KB |
Output is correct |
10 |
Correct |
262 ms |
94404 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
637 ms |
61692 KB |
Output is correct |
2 |
Correct |
691 ms |
57136 KB |
Output is correct |
3 |
Correct |
398 ms |
71416 KB |
Output is correct |
4 |
Correct |
399 ms |
63948 KB |
Output is correct |
5 |
Correct |
485 ms |
81704 KB |
Output is correct |
6 |
Correct |
431 ms |
84112 KB |
Output is correct |
7 |
Correct |
477 ms |
84008 KB |
Output is correct |
8 |
Correct |
613 ms |
72720 KB |
Output is correct |
9 |
Correct |
724 ms |
69624 KB |
Output is correct |
10 |
Correct |
260 ms |
93144 KB |
Output is correct |