Submission #1185033

#	Time	Username	Problem	Language	Result	Execution time	Memory
1185033		starnightsnow	Crayfish scrivener (IOI12_scrivener)	C++20	34 / 100	1095 ms	10640 KiB

scrivener

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

const int MAXN = 2000005;

vector<char> v;      
vector<int> parent;      
vector<int> sz;      
vector<int> mp;   

int cur = 0;

void Init() {
    v.assign(1, 0);    
    parent.assign(1, -1);  
    sz.assign(1, 0);   
    mp.assign(1, 0);
    cur = 0;
}

void TypeLetter(char L) {
    int new_version = v.size();
    v.push_back(L);
    parent.push_back(cur);
    sz.push_back(sz[cur] + 1);
    mp.push_back(new_version);
    cur = new_version;
}

void UndoCommands(int U) {
    int undo = mp[mp.size() - 1 - U];
    mp.push_back(undo);
    cur = undo;
}

char GetLetter(int P) {
    int now = cur;
    int need = sz[now] - 1 - P;
    while (now != 0) {
        if (need == 0) 
            return v[now];
        now = parent[now];
        need--;
    }
    return ' '; 
}

• Subtask 1: 5 / 5
• Subtask 2: 7 / 7
• Subtask 3: 22 / 22
• Subtask 4: 0 / 26
• Subtask 5: 0 / 40