Submission #63337

#	Time	Username	Problem	Language	Result	Execution time	Memory
63337		Vahan	Crayfish scrivener (IOI12_scrivener)	C++17	34 / 100	1058 ms	105884 KiB

scrivener

#include<cmath>
char last;

void Init() {}
int t=-1,er[2000000],a[1000005][23];
char v[2000000];
void TypeLetter(char L)
{
    t++;
    if(t==0)
        er[t]=1;
    else
        er[t]=er[t-1]+1;
    v[t]=L;
    for(int i=0;i<log2(er[t]);i++)
    {
        if(i==0)
            a[t][0]=t-1;
        else
            a[t][i]=a[a[t][i-1]][i-1];
    }
}

void UndoCommands(int U)
{
    t++;
    er[t]=er[t-U-1];
    v[t]=v[t-U-1];
    for(int i=0;i<log2(er[t]);i++)
        a[t][i]=a[t-U-1][i];
}

char GetLetter(int P)
{
    int p=er[t]-P-1;
    int e=t;
    while(p!=0)
    {
        e=a[e][int(log2(p))];
        p-=pow(2,int(log2(p)));
    }
    return v[e];
}

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