Submission #63342

#	Time	Username	Problem	Language	Result	Execution time	Memory
63342		Vahan	Crayfish scrivener (IOI12_scrivener)	C++17	100 / 100	925 ms	118308 KiB

scrivener

#include<cmath>
char last;

void Init() {}
int t=-1,er[2000000],a[1000005][23],x[25];
char v[2000000];
void TypeLetter(char L)
{
    if(x[0]==0)
    {
        x[0]=1;
        for(int i=1;i<=20;i++)
            x[i]=x[i-1]*2;
    }
    t++;
    if(t==0)
        er[t]=1;
    else
        er[t]=er[t-1]+1;
    v[t]=L;
    for(int i=0;x[i]<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;x[i]<er[t];i++)
        a[t][i]=a[t-U-1][i];
}

char GetLetter(int P)
{
    int p=er[t]-P-1;
    int e=t,b[25];
    int r=-1;
    while(p!=0)
    {
        r++;
        if(p%2==0)
            b[r]=0;
        else
            b[r]=1;
        p/=2;
    }
    for(int i=r;i>=0;i--)
        if(b[i]==1)
            e=a[e][i];
    return v[e];
}

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