Submission #574354

#	Time	Username	Problem	Language	Result	Execution time	Memory
574354		FatihSolak	Crayfish scrivener (IOI12_scrivener)	C++17	100 / 100	812 ms	94472 KiB

scrivener

#include <bits/stdc++.h>
#define N 1000005
#define K 21
using namespace std;
int par[N][K];
int len[N];
int point[N];
char last[N];
int cnt = 0;
void Init() {}
 
void TypeLetter(char l) {
    last[cnt+1] = l;
    point[cnt+1] = cnt+1;
    len[cnt+1] = len[cnt] + 1;
    int tmp = point[cnt+1];
    par[tmp][0] = point[tmp-1];
    for(int j = 1;j<K;j++){
        par[tmp][j] = par[par[tmp][j-1]][j-1];
    }
    cnt++;
}
 
void UndoCommands(int u) {
    point[cnt+1] = point[cnt-u];
    len[cnt+1] = len[cnt - u];
    int tmp = point[cnt+1];
    par[tmp][0] = point[tmp-1];
    for(int j = 1;j<K;j++){
        par[tmp][j] = par[par[tmp][j-1]][j-1];
    }
    cnt++;
}
 
char GetLetter(int p) {
    int tot = len[cnt];
    int needed = tot - p;
    int tmp = point[cnt];
    for(int i = K-1;i>=0;i--){
        if((1<<i) < needed){
            needed -= (1<<i);
            tmp = par[tmp][i];
        }
    }
    return last[tmp];
}

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