Submission #848087

#	Time	Username	Problem	Language	Result	Execution time	Memory
848087		I_love_Hoang_Yen	Robot Contest (IOI23_robot)	C++17	34 / 100	119 ms	7128 KiB

robot

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

#define FOR(i,a,b) for(int i=(a),_##i##_b=(b); i<=_##i##_b; i++)

void subtask1() {
    FOR(cur,0,1) FOR(west,-2,1) FOR(south,-2,1) FOR(east,-2,1) FOR(north,-2,1) {
        vector<int> state {cur, west, south, east, north};
        if (south == -2 && east == -2) {  // final state -> terminate
            set_instruction(state, 1, 'T');
        } else if (east == -2) {
            set_instruction(state, 1, 'S');
        } else {
            set_instruction(state, 1, 'E');
        }
    }
}

void subtask2() {
    FOR(cur,0,1) FOR(west,-2,1) FOR(south,-2,1) FOR(east,-2,1) FOR(north,-2,1) {
        vector<int> state {cur, west, south, east, north};
        if (south == -2 && east == -2) {  // final state -> terminate
            set_instruction(state, 1, 'T');
        } else if (east == 0) {
            set_instruction(state, 1, 'E');
        } else if (south == 0) {
            set_instruction(state, 1, 'S');
        } else if (north == 0) {
            set_instruction(state, 1, 'N');
        }
    }
}

void subtask3() {
    const int MAX_COLOR = 10;

    const int BOUNDARY = -2;
    const int BLOCKED = -1;

    const int FINAL = 1;

    const int TRY_EAST = 2;
    const int TRY_SOUTH = 3;
    const int TRY_WEST = 4;
    const int TRY_NORTH = 5;

    const int BACKTRACK = 10;

#define SET(color, action) { set_instruction(state, color, action); continue; }

    FOR(cur,0,MAX_COLOR) FOR(west,-2,MAX_COLOR) FOR(south,-2,MAX_COLOR) FOR(east,-2,MAX_COLOR) FOR(north,-2,MAX_COLOR) {
        vector<int> state {cur, west, south, east, north};

        // Found target
        if ((south == BOUNDARY && east == BOUNDARY) || west == FINAL || south == FINAL || east == FINAL || north == FINAL) {
            if (north > 1) SET(FINAL, 'N');
            if (west > 1) SET(FINAL, 'W');
            if (south > 1) SET(FINAL, 'S');
            if (east > 1) SET(FINAL, 'E');
            SET(FINAL, 'T');
        }

        if (cur == 0) SET(TRY_EAST, 'H');

        if (cur == TRY_EAST) SET(TRY_SOUTH, east == 0 ? 'E' : 'H');
        if (cur == TRY_SOUTH) SET(TRY_WEST, south == 0 ? 'S' : 'H');
        if (cur == TRY_WEST) SET(TRY_NORTH, west == 0 ? 'W' : 'H');
        if (cur == TRY_NORTH) SET(BACKTRACK, north == 0 ? 'N' : 'H');

        if (cur == BACKTRACK) {
            if (north > 0) SET(0, 'N');
            if (west > 0) SET(0, 'W');
            if (south > 0) SET(0, 'S');
            if (east > 0) SET(0, 'E');
        }
    }
}

void program_pulibot() {
    subtask3();
}

Compilation message (stderr)

robot.cpp: In function 'void subtask3()':
robot.cpp:39:15: warning: unused variable 'BLOCKED' [-Wunused-variable]
   39 |     const int BLOCKED = -1;
      |               ^~~~~~~

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