Submission #1009428

#	Time	Username	Problem	Language	Result	Execution time	Memory
1009428		SulA	Crayfish scrivener (IOI12_scrivener)	C++17	100 / 100	675 ms	82636 KiB

scrivener

#include <iostream>
#include <vector>
#include <string>
using namespace std;

const int MAXN = 1e6;
int t[MAXN+1][20], len[MAXN+1];
int pos = 0;
char letter[MAXN+1];

void Init() {}

void TypeLetter(char L) {
    letter[++pos] = L;
    len[pos] = len[pos-1] + 1;
    t[pos][0] = pos - 1;
    for (int b = 1; b < 20; b++) {
        t[pos][b] = t[t[pos][b-1]][b-1];
    }
}

void UndoCommands(int U) {
    letter[++pos] = ' ';
    len[pos] = len[pos - U - 1];
    t[pos][0] = pos - U - 1;
    for (int b = 1; b < 20; b++) {
        t[pos][b] = t[t[pos][b-1]][b-1];
    }
}

char GetLetter(int P) {
    int cur = pos;
    P++;
    for (int b = 19; b >= 0; b--) {
        if (len[t[cur][b]] >= P) {
            cur = t[cur][b];
        }
    }
    return letter[cur];
}

void OutputLogs() {}

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