제출 #680002

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
680002		Ahmed57	Crayfish scrivener (IOI12_scrivener)	C++14	0 / 100	504 ms	82416 KiB

scrivener

#include <bits/stdc++.h>

using namespace std;
char arr[1000001];
int len[1000001];
map<int,int> mp;
int op = 0 , root = 0 , node = 0;
int lift[1000001][20];
void Init(){
    mp[op] = root;
}
void TypeLetter(char l){
    node++;
    lift[node][0] = root;
    for(int i = 1;i<20;i++){
        lift[node][i] = lift[lift[node][i-1]][i-1];
    }
    len[node] = len[root]+1;
    root = node;
    op++;
    mp[op] = root;
    arr[root] = l;
}
void UndoCommands(int u){
    mp[op+1] = mp[op-u];
    root = mp[++op];
}
char GetLetter(int p){
    int cc = root;
    p = (p+1)-len[root];
    for(int i = 19;i>=0;i--){
        if(p>=(1<<i)){
            p-=(1<<i);
            cc =lift[cc][i];
        }
    }
    return arr[cc];
}
/*int main(){
    ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
    Init();
    TypeLetter('a');
    cout<<root<<"\n";
    TypeLetter('b');
    cout<<root<<"\n";
    cout<<GetLetter(1)<<"\n";
    TypeLetter('d');
    cout<<root<<"\n";
    UndoCommands(2);
    cout<<root<<"\n";
    UndoCommands(1);
    cout<<root<<"\n";
    cout<<GetLetter(2)<<"\n";
}*/

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