Submission #956016

#	Time	Username	Problem	Language	Result	Execution time	Memory
956016		Dan4Life	Robot Contest (IOI23_robot)	C++17	0 / 100	1 ms	348 KiB

robot

#include "robot.h"
#include <bits/stdc++.h>
using namespace std;

void program_pulibot()
{
    //set_instruction({0, -2, -1, 0, -2}, 1, 'E');
    //set_instruction({0, 1, -1, 0, -2}, 1, 'E');
    //set_instruction({0, 1, 0, -2, -2}, 1, 'S');
    //set_instruction({0, -1, -2, -2, 1}, 1, 'T');

    string dir = "WSEN";

    // 0 means unvisited                    (white)
    // 1 means final visit                  (yellow)
    // 2 means blocked                      (red)
    // 3 means temp. visit                  (blue)
    int white = 0, yellow = 1, red = 2, blue = 3;
    for(int i = 0; i <= 3; i++){
        for(int j = -2; j <= 3; j++){
            for(int k = -2; k <= 3; k++){
                for(int l = -2; l <= 3; l++){
                    for(int m = -2; m <= 3; m++){

                        if(j==-2 and m==-2 and i==yellow){
                            // starting location and color = yellow
                            set_instruction({i,j,k,l,m},yellow,'T');
                        }
                        else if(k==-2 and l==-2){
                            // final location, start coloring with yellow
                            int pos = -1;
                            if(j==blue) pos=0;
                            else if(k==blue) pos=1;
                            else if(l==blue) pos=2;
                            else if(m==blue) pos=3;
                            set_instruction({i,j,k,l,m},yellow,dir[pos]);
                        }
                        else if(j==yellow or k==yellow or l==yellow or m==yellow){
                            // if yellow somewhere, we are in the final phase

                            if(j==red or k==red or l==red or m==red){
                                // firstly if there's red cell, go there while marking here as yellow

                                int pos = -1;
                                if(j==red) pos=0;
                                else if(k==red) pos=1;
                                else if(l==red) pos=2;
                                else if(m==red) pos=3;
                                set_instruction({i,j,k,l,m},yellow,dir[pos]);
                            }
                            else if(j==blue or k==blue or l==blue or m==blue){
                                // if no red cell, but there are blue cells, go there
                                int pos = -1;
                                if(j==blue) pos=0;
                                else if(k==blue) pos=1;
                                else if(l==blue) pos=2;
                                else if(m==blue) pos=3;
                                set_instruction({i,j,k,l,m},yellow,dir[pos]);
                            }
                            else if(i==red or i==yellow){
                                // if we are in a blocked place already, clear it, traverse back
                                int pos = -1;
                                if(j==yellow) pos=0;
                                else if(k==yellow) pos=1;
                                else if(l==yellow) pos=2;
                                else if(m==yellow) pos=3;
                                set_instruction({i,j,k,l,m},white,dir[pos]);
                            }

                        }
                        else if(i==blue and (j==white or k==white or l==white or m==white)){
                            // if still in the exploration phase and we can explore:
                            // go to the next unvisited position, randomly
                            int pos = -1;
                            if(j==white) pos=0;
                            else if(k==white) pos=1;
                            else if(l==white) pos=2;
                            else if(m==white) pos=3;
                            set_instruction({i,j,k,l,m},blue,dir[pos]);
                        }
                        else if((i==white or i==blue) and (j==blue or k==blue or l==blue or m==blue)){
                            // if we just entered a new cell or we are in an already temporarily visited cell and no where to go, 
                            // mark as blocked, backtrack
                            int pos = -1;
                            if(j==blue) pos=0;
                            else if(k==blue) pos=1;
                            else if(l==blue) pos=2;
                            else if(m==blue) pos=3;
                            set_instruction({i,j,k,l,m},red,dir[pos]);
                        }
                    }
                }
            }
        }
    }
}
/*
if there's an unvisited place: mark 1, go there (random choice if many unvisited)

Otherwise from now on there's no where to go:

if at the final cell: mark 1, terminate
else:

mark 2: go to the place marked 1
if we have a dead end (no places marked 0): go to the place marked 1
if there's no unvisited place, go back
*/

• Subtask 0: 0 / 0
• Subtask 1: 0 / 6
• Subtask 2: 0 / 10
• Subtask 3: 0 / 18
• Subtask 4: 0 / 20
• Subtask 5: 0 / 46