Submission #1066757

#	Time	Username	Problem	Language	Result	Execution time	Memory
1066757		Luvidi	Crayfish scrivener (IOI12_scrivener)	C++17	100 / 100	690 ms	90528 KiB

scrivener

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

const int maxq=1e6;
char pre[maxq+1];
int a[maxq+1][21],curr,len[maxq+1];
string s;

void Init() {
    
}

void TypeLetter(char l) {
    curr++;
    pre[curr]=l;
    len[curr]=len[curr-1]+1;
    a[curr][0]=curr-1;
    for(int i=1;i<=20;i++){
        a[curr][i]=a[a[curr][i-1]][i-1];
    }
}

void UndoCommands(int u) {
    curr++;
    len[curr]=len[curr-u-1];
    a[curr][0]=curr-u-1;
    for(int i=1;i<=20;i++){
        a[curr][i]=a[a[curr][i-1]][i-1];
    }
}

char GetLetter(int p) {
    int c=curr;
    for(int i=20;i>-1;i--){
        if(len[a[c][i]]>p)c=a[c][i];
    }
    return pre[c];
}

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