Submission #7574

#	Time	Username	Problem	Language	Result	Execution time	Memory
7574		baneling100	Crayfish scrivener (IOI12_scrivener)	C++98	100 / 100	504 ms	127056 KiB

scrivener

int NodeNum, Anc[1000001][30], OrderNum, Order[1000001], Lev[1000001];
char A[1000001];

void Init(void)
{
}

void TypeLetter(char L)
{
    int i;

    NodeNum++;
    A[NodeNum]=L;
    Anc[NodeNum][0]=Order[OrderNum];
    Lev[NodeNum]=Lev[Order[OrderNum]]+1;
    i=1;
    while(Anc[Anc[NodeNum][i-1]][i-1])
    {
        Anc[NodeNum][i]=Anc[Anc[NodeNum][i-1]][i-1];
        i++;
    }
    OrderNum++;
    Order[OrderNum]=NodeNum;
}

void UndoCommands(int U)
{
    OrderNum++;
    Order[OrderNum]=Order[OrderNum-U-1];
}

char GetLetter(int P)
{
    int N, Now, Cnt=0;

    N=Lev[Order[OrderNum]]-P-1;
    Now=Order[OrderNum];
    while(N)
    {
        if(N&1)
            Now=Anc[Now][Cnt];
        Cnt++;
        N>>=1;
    }
    return A[Now];
}

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