Submission #62914

#	Time	Username	Problem	Language	Result	Execution time	Memory
62914		theknife2001	Crayfish scrivener (IOI12_scrivener)	C++17	0 / 100	1061 ms	263168 KiB

scrivener

#include <bits/stdc++.h>


using namespace std;
const int N=1e6+55;
int trie[N*4][26];
char letter[N];
int p[N][22];
int a[N];
int l[N];
int node;
int cnt=1;
int k;

void Init()
{
    node=cnt++;
    memset(trie,-1,sizeof trie);
}


void TypeLetter(char L)
{
    int c=L-'a';
    int temp=node;
    if(trie[node][c]==-1)
        trie[node][c]=cnt++;
    node=trie[node][c];
    letter[node]=L;
    a[k]=node;
    l[k]=l[k-1]+1;
    p[node][0]=temp;
    for(int i=1;i<=21;i++)
        p[node][i]=p[p[node][i-1]][i-1];
//    cout<<node<<' '<<l[k]<<' '<<L<<endl;
    k++;
}

void UndoCommands(int U)
{
    node=a[k-U-1];
    l[k]=l[k-U-1];
    a[k]=node;
//    cout<<a[k]<<' '<<l[k]<<endl;
    k++;
}
char GetLetter(int P)
{
    P=l[k-1]-P-1;
//    cout<<P<<endl;
    int nd=node;
    for(int i=21;i>=0;i--)
    {
        if(P&(1<<i))
            nd=p[nd][i];
    }
    return letter[nd];
}

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