Submission #883253

#	Time	Username	Problem	Language	Result	Execution time	Memory
883253		JakobZorz	Crayfish scrivener (IOI12_scrivener)	C++14	100 / 100	549 ms	140624 KiB

scrivener

#include<iostream>
using namespace std;

struct Trie{
    int ch[26],par[20];
    int depth;
    char c;
};

int curr;
int ct=2;
Trie tries[2000000];
int strs[1000000];

void Init(){
    for(int i=0;i<20;i++)
        tries[1].par[i]=1;
}

void TypeLetter(char L){
    curr++;
    strs[curr]=strs[curr-1];
    int l=L-'a';
    if(tries[strs[curr]].ch[l]==0){
        tries[ct].depth=tries[strs[curr]].depth+1;
        tries[ct].c=L;
        tries[ct].par[0]=strs[curr];
        for(int i=1;i<20;i++)
            tries[ct].par[i]=tries[tries[ct].par[i-1]].par[i-1];
        
        tries[strs[curr]].ch[l]=ct++;
    }
    strs[curr]=tries[strs[curr]].ch[l];
}

void UndoCommands(int U){
    curr++;
    strs[curr]=strs[curr-U-1];
}

char GetLetter(int P){
    int ct=strs[curr];
    for(int i=19;i>=0;i--){
        if(tries[tries[ct].par[i]].depth>P)
            ct=tries[ct].par[i];
    }
    return tries[ct].c;
}

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