Submission #31142

#	Time	Username	Problem	Language	Result	Execution time	Memory
31142		cscandkswon	Crayfish scrivener (IOI12_scrivener)	C++14	100 / 100	703 ms	92976 KiB

scrivener

#include <bits/stdc++.h>
using namespace std;
const int MAXN=1000005;
int N, nod, now, cmd;
int spt[MAXN][21], A[MAXN], L[MAXN];
char let[MAXN];

void Init() {}

void TypeLetter(char c) {
    int i, p;
    A[++cmd]=now;
    let[++nod]=c;
    L[nod]=L[now]+1;
    spt[nod][0]=now;
    now=nod;
    for(i=1, p=now; ; i++){
        if(spt[spt[p][i-1]][i-1]==0) break;
        spt[p][i]=spt[spt[p][i-1]][i-1];
    }
}

void UndoCommands(int U) {
    A[++cmd]=now;
    now=A[cmd-U];
}

char GetLetter(int P) {
    int i, p=now, q=L[now]-P-1;
    for(i=20; i>=0; i--)if((1<<i)&q){
        p=spt[p][i];
    }
    return let[p];
}

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