Submission #1036267

#	Time	Username	Problem	Language	Result	Execution time	Memory
1036267		stdfloat	Crayfish scrivener (IOI12_scrivener)	C++17	34 / 100	1058 ms	16208 KiB

scrivener

#include <bits/stdc++.h>
using namespace std;

const int N = (int)1e6 + 1;

int q, cnt, cur;

vector<char> ch(N);

vector<int> num(N), pr(N), d(N);

void Init() {}

void TypeLetter(char L) {
    num[++q] = ++cnt;

    ch[cnt] = L;
    pr[cnt] = cur;
    d[cnt] = d[cur] + 1;

    cur = cnt;
}

void UndoCommands(int U) {
    q++;

    num[q] = cur = num[q - U - 1];
}

char GetLetter(int P) {
    P = d[cur] - P - 1;

    int x = cur;
    while (P--) x = pr[x];

    return ch[x];
}

• Subtask 1: 5 / 5
• Subtask 2: 7 / 7
• Subtask 3: 22 / 22
• Subtask 4: 0 / 26
• Subtask 5: 0 / 40