#include <bits/stdc++.h>
using namespace std;
#include "robot.h"
const int BOUNDARY = -2;
const int OBSTACLE = -1;
const int EMPTY = 0;
const int PATH = 1;
const int WEST = 2;
const int SOUTH = 3;
const int EAST = 4;
const int NORTH = 5;
const char STAY = 'H';
const char TERMINATE = 'T';
bool phase2(int cur, int west, int south, int east, int north)
{
if (cur == EMPTY) return false;
if (cur == WEST) return west != EAST;
if (cur == SOUTH) return south != NORTH;
if (cur == EAST) return east != WEST;
if (cur == NORTH) return north != SOUTH;
return false;
}
pair<int, char> get_instruction(int cur, int west, int south, int east, int north)
{
if (east == BOUNDARY && south == BOUNDARY && cur == EMPTY)
return {EAST, STAY};
if (phase2(cur, west, south, east, north))
{
if (west == EAST) return {cur, 'W'};
if (south == NORTH) return {cur, 'S'};
if (east == WEST) return {cur, 'E'};
if (north == SOUTH) return {cur, 'N'};
if (east == BOUNDARY && south == BOUNDARY)
return {PATH, TERMINATE};
char dir;
if (cur == WEST)
dir = 'W';
else if (cur == SOUTH)
dir = 'S';
else if (cur == EAST)
dir = 'E';
else
dir = 'N';
if ((west == BOUNDARY && north == BOUNDARY) || west == PATH || south == PATH || east == PATH || north == PATH)
return {PATH, dir};
return {EMPTY, dir};
}
if (west == BOUNDARY && north == BOUNDARY && cur == EMPTY)
{
if (south == OBSTACLE)
return {EAST, 'E'};
return {SOUTH, 'S'};
}
if (cur == EMPTY)
{
if (west == EAST)
return {WEST, 'W'};
if (south == NORTH)
return {SOUTH, 'S'};
if (east == WEST)
return {EAST, 'E'};
if (north == SOUTH)
return {NORTH, 'N'};
return {0, TERMINATE};
}
for (int i = 0; i < 4; i++)
{
if (cur == WEST)
{
cur = NORTH;
if (north == EMPTY || north == SOUTH)
return {NORTH, 'N'};
}
else if (cur == SOUTH)
{
cur = WEST;
if (west == EMPTY || west == EAST)
return {WEST, 'W'};
}
else if (cur == EAST)
{
cur = SOUTH;
if (south == EMPTY || south == NORTH)
return {SOUTH, 'S'};
}
else if (cur == NORTH)
{
cur = EAST;
if (east == EMPTY || east == WEST)
return {EAST, 'E'};
}
else
cur = WEST;
}
return {0, TERMINATE};
}
void program_pulibot()
{
for (int cur = -2; cur <= 5; cur++)
for (int west = -2; west <= 5; west++)
for (int south = -2; south <= 5; south++)
for (int east = -2; east <= 5; east++)
for (int north = -2; north <= 5; north++)
{
pair<int, char> instruction = get_instruction(cur, west, south, east, north);
set_instruction({cur, west, south, east, north}, instruction.first, instruction.second);
}
}
