Submission #426804

#	Time	Username	Problem	Language	Result	Execution time	Memory
426804		dxz05	Crayfish scrivener (IOI12_scrivener)	C++14	100 / 100	851 ms	102084 KiB

scrivener

#include <bits/stdc++.h>

using namespace std;

const int N = 1e6 + 3e2;

int prv[N], id[N], len[N];
int commands = 0, up[N][22];
char ch[N];

void Init() {
}

void TypeLetter(char L) {
    commands++;
    id[commands] = commands;
    int x = id[commands];
    prv[x] = max(1, id[commands - 1]);
    ch[x] = L;
    len[x] = len[prv[x]] + 1;
    up[x][0] = prv[x];
    for (int i = 1; i < 22; i++){
        up[x][i] = up[up[x][i - 1]][i - 1];
    }
    //cout << "\t" << commands << ' ' << L << endl;
}

void UndoCommands(int U) {
    commands++;
    id[commands] = id[commands - U - 1];
}

char GetLetter(int P) {
    P++;
    int x = id[commands];
    for (int i = 21; i >= 0; i--){
        if (len[up[x][i]] >= P) x = up[x][i];
    }
    return ch[x];
}

/**
14
T a
T b
P 1
T d
U 2
U 1
P 2
T e
U 1
U 5
T c
P 2
U 2
P 2

5
T a
U 1
U 1
U 2
P 0
*/

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