Submission #956247

#	Time	Username	Problem	Language	Result	Execution time	Memory
956247		Dan4Life	Robot Contest (IOI23_robot)	C++17	0 / 100	85 ms	5652 KiB

robot

#include "robot.h"
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define sz(a) (int)a.size()
#define all(a) begin(a),end(a)
using ll = long long;
using vi = vector<int>;
using vll = vector<ll>;


// 0 = unvisited                    (white)
// 1 = final visit                  (yellow)
// 2 = temp. visit                  (blue)
// 3 = blocked                      (red)
int boundary = -2;
int white = 0, yellow = 1, blue = 2, red = 3;
string dir = "WSENHT";
int i, j, k, l, m;

char get_dir(int col, vector<int> subset={1,2,3,4}){
    int pos = 4;
    for(int cur = 0; cur < sz(subset); cur++){
        auto u = subset[cur];
        if(u==1 and j==col) pos=0;
        else if(u==2 and k==col) pos=1;
        else if(u==3 and l==col) pos=2;
        else if(u==4 and m==col) pos=3;
    }
    return dir[pos];
}

bool exists_neighbour(int col, vector<int> subset={1,2,3,4}){
    for(int cur = 0; cur < sz(subset); cur++){
        auto u = subset[cur];
        if(u==1 and j==col) return true;
        if(u==2 and k==col) return true;
        if(u==3 and l==col) return true;
        if(u==4 and m==col) return true;
    }
    return false;
}

void program_pulibot()
{
    for(i = 0; i <= 0; i++){
        for(j = -2; j <= 3; j++){
            for(k = -2; k <= 3; k++){
                for(l = -2; l <= 3; l++){
                    for(m = -2; m <= 3; m++){
                        if(k==boundary and l==boundary){
                            // final location, terminate
                            set_instruction({i,j,k,l,m},blue,'T');
                        }
                        else if(exists_neighbour(white,{2,3})){
                            // if still in the exploration phase and we can explore down or left:
                            // go to the next unvisited position, randomly
                            set_instruction({i,j,k,l,m},blue,get_dir(white,{2,3}));
                        }
                        else if(exists_neighbour(blue)){
                            // no where to go, mark as blocked, backtrack
                            set_instruction({i,j,k,l,m},red,get_dir(blue));
                        }
                    }
                }
            }
        }
    }
}
/*
always go down if possible (color with blue)
else always go right if possible (color with blue)
if we eventually reach the end:
    on to the next phase, but before we do that, lets submit

else:
it is not possible to move down or right, so backtrack while coloring red and go back to the previous blue
*/

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