Submission #1185030

#	Time	Username	Problem	Language	Result	Execution time	Memory
1185030		starnightsnow	Crayfish scrivener (IOI12_scrivener)	C++20	Compilation error	0 ms	0 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 v = cur;
    int need = sz[v] - 1 - P;
    while (v != 0) {
        if (need == 0) 
            return v[v];
        v = parent[v];
        need--;
    }
    return ' '; 
}

Compilation message (stderr)

scrivener.cpp: In function 'char GetLetter(int)':
scrivener.cpp:42:21: error: invalid types 'int[int]' for array subscript
   42 |             return v[v];
      |                     ^