Submission #117488

#	Time	Username	Problem	Language	Result	Execution time	Memory
117488		someone_aa	Crayfish scrivener (IOI12_scrivener)	C++17	0 / 100	232 ms	64376 KiB

scrivener

#include <bits/stdc++.h>
#define ll long long
#define pb push_back
#define mp make_pair
#define pii pair<int,int>
using namespace std;
const int N = (1<<20);
const int LOGN = 20;
char q_type[N];
char last[N];
int len[N], q, position;
int point[N][LOGN];

char type, letter;
int _time, cekori;
int moment;

void Init() {
    _time = 1;
    moment = 1;
}

void TypeLetter(char letter) {
    //cin>>letter;
    q_type[_time] = type;
    len[_time] = len[_time-1] + 1;
    last[_time] = letter;
    if(q_type[_time-1] == 'T') point[_time][0] = _time-1;
    else if(q_type[_time-1] == 'U') point[_time][0] = point[_time-1][0];

    for(int i=1;i<20;i++) {
        point[_time][i] = point[point[_time][i-1]][i-1];
    }

    /*cout<<len[_time]<<" "<<last[_time]<<" Pointers: \n";
    for(int i=0;i<20;i++) {
        cout<<(1<<i)<<" th-parent: "<<point[_time][i]<<"\n";
    }*/
    _time++;
}

void UndoCommands(int cekori) {
    q_type[_time] = type;
    len[_time] = len[_time-cekori-1];
    last[_time] = last[_time-cekori-1];

    if(q_type[_time-cekori-1] == 'T') point[_time][0] = _time-cekori-1;
    else if(q_type[_time-cekori-1] == 'U') point[_time][0] = point[_time-cekori-1][0];

    for(int i=1;i<20;i++) {
        point[_time][i] = point[point[_time][i-1]][i-1];
    }

    //cout<<len[_time]<<" "<<point[_time]<<" "<<last[_time]<<"\n";
    /*cout<<len[_time]<<" "<<last[_time]<<" Pointers: \n";
    for(int i=0;i<20;i++) {
        cout<<(1<<i)<<" th-parent: "<<point[_time][i]<<"\n";
    }*/

    _time++;
}

char GetLetter(int position) {
    int ttime = _time - 1;
    //cout<<"Query: ";
    int temp = len[ttime] - position ;
    int c = ttime;

    if(q_type[c] == 'U') c = point[c][0];
    int left_path = temp;
            //cout<<temp<<"\n";
    int sum = 0;
    for(int i=19;i>=0;i--) {
                //cout<<c<<" -> "<<left_path<<"\n";
        if(point[c][i] != 0 && left_path - (1<<i) >0 ){
            c = point[c][i];
            left_path -= (1<<i);
        }
    }
    //cout<<c<<"\n";
    return last[c];
}

Compilation message (stderr)

scrivener.cpp: In function 'char GetLetter(int)':
scrivener.cpp:72:9: warning: unused variable 'sum' [-Wunused-variable]
     int sum = 0;
         ^~~

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