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OJ10.cc
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#include <iostream>
#include <bitset>
#include <queue>
using namespace std;
bitset<1024> map[1024];
bitset<1024> visited[1024][4];
short lx, ly;
short ax, ay, az, bx, by, bz, cx, cy, cz;
string outputPath;
short goal[4][2] = {{-1, 0}, {0, -1}, {1, 0}, {0, 1}};
short temp;
struct point
{
short x, y, z;
// int length;
string path;
};
void Search()
{
for (short i = 0; i < ly + 4; i++)
for (short j = 0; j < 4; j++)
visited[i][j].reset();
point start, next, current;
start.x = ax, start.y = ay, start.z = az, start.path = "";
queue<point> q;
q.push(start);
while (!q.empty())
{
current = q.front();
if (current.x == bx && current.y == by && current.z == bz)
{
outputPath = current.path;
// return current.length;
}
q.pop();
if (map[current.y + goal[current.z][0]][current.x + goal[current.z][1]] == 0 && visited[current.y + goal[current.z][0]][current.z][current.x + goal[current.z][1]] == 0) // F
{
next.x = current.x + goal[current.z][1];
next.y = current.y + goal[current.z][0];
next.z = current.z;
// next.length = current.length + 1;
next.path = current.path + 'F';
q.push(next);
visited[current.y + goal[current.z][0]][current.z][current.x + goal[current.z][1]] = 1;
}
if (map[current.y + goal[current.z][0]][current.x + goal[current.z][1]] == 0 && map[current.y + 2 * goal[current.z][0]][current.x + 2 * goal[current.z][1]] == 0 && visited[current.y + 2 * goal[current.z][0]][current.z][current.x + 2 * goal[current.z][1]] == 0) // F2
{
next.x = current.x + 2 * goal[current.z][1];
next.y = current.y + 2 * goal[current.z][0];
next.z = current.z;
// next.length = current.length + 1;
next.path = current.path + '2';
q.push(next);
visited[current.y + 2 * goal[current.z][0]][current.z][current.x + 2 * goal[current.z][1]] = 1;
}
if (visited[current.y][(current.z + 1) % 4][current.x] == 0) // L
{
next.x = current.x;
next.y = current.y;
next.z = (current.z + 1) % 4;
// next.length = current.length + 1;
next.path = current.path + 'L';
q.push(next);
visited[current.y][(current.z + 1) % 4][current.x] = 1;
}
if (visited[current.y][(current.z + 3) % 4][current.x] == 0) // R
{
next.x = current.x;
next.y = current.y;
next.z = (current.z + 3) % 4;
// next.length = current.length + 1;
next.path = current.path + 'R';
q.push(next);
visited[current.y][(current.z + 3) % 4][current.x] = 1;
}
}
// return 114514;
}
void Search2()
{
for (short i = 0; i < ly + 4; i++)
for (short j = 0; j < 4; j++)
visited[i][j].reset();
point start, next, current;
start.x = bx, start.y = by, start.z = bz, start.path = "";
queue<point> q;
q.push(start);
while (!q.empty())
{
current = q.front();
if (current.x == cx && current.y == cy && current.z == cz)
{
outputPath += current.path;
// return current.length;
}
q.pop();
if (map[current.y + goal[current.z][0]][current.x + goal[current.z][1]] == 0 && visited[current.y + goal[current.z][0]][current.z][current.x + goal[current.z][1]] == 0) // F
{
next.x = current.x + goal[current.z][1];
next.y = current.y + goal[current.z][0];
next.z = current.z;
// next.length = current.length + 1;
next.path = current.path + 'F';
q.push(next);
visited[current.y + goal[current.z][0]][current.z][current.x + goal[current.z][1]] = 1;
}
if (map[current.y + goal[current.z][0]][current.x + goal[current.z][1]] == 0 && map[current.y + 2 * goal[current.z][0]][current.x + 2 * goal[current.z][1]] == 0 && visited[current.y + 2 * goal[current.z][0]][current.z][current.x + 2 * goal[current.z][1]] == 0) // F2
{
next.x = current.x + 2 * goal[current.z][1];
next.y = current.y + 2 * goal[current.z][0];
next.z = current.z;
// next.length = current.length + 1;
next.path = current.path + '2';
q.push(next);
visited[current.y + 2 * goal[current.z][0]][current.z][current.x + 2 * goal[current.z][1]] = 1;
}
if (map[current.y][current.x] == 0 && visited[current.y][(current.z + 1) % 4][current.x] == 0) // L
{
next.x = current.x;
next.y = current.y;
next.z = (current.z + 1) % 4;
// next.length = current.length + 1;
next.path = current.path + 'L';
q.push(next);
visited[current.y][(current.z + 1) % 4][current.x] = 1;
}
if (visited[current.y][(current.z + 3) % 4][current.x] == 0) // R
{
next.x = current.x;
next.y = current.y;
next.z = (current.z + 3) % 4;
// next.length = current.length + 1;
next.path = current.path + 'R';
q.push(next);
visited[current.y][(current.z + 3) % 4][current.x] = 1;
}
}
// return 114514;
}
int main()
{
std::ios_base::sync_with_stdio(false);
cin >> lx >> ly;
for (short i = 0; i < ly + 4; i++)
{
map[i][0] = 1;
map[i][1] = 1;
map[i][lx + 2] = 1;
map[i][lx + 3] = 1;
}
for (short i = 0; i < lx + 4; i++)
{
map[0][i] = 1;
map[1][i] = 1;
map[ly + 1][i] = 1;
map[ly + 2][i] = 1;
}
for (short i = 2; i <= ly + 1; i++)
for (short j = 2; j <= lx + 1; j++)
{
cin >> temp;
map[i][j] = temp;
}
cin >> ax >> ay >> az >> bx >> by >> bz >> cx >> cy >> cz;
ax += 2, ay += 2, bx += 2, by += 2, cx += 2, cy += 2, az--, bz--, cz--;
Search();
Search2();
int res = outputPath.length();
cout << res << endl;
for (auto i : outputPath)
{
switch (i)
{
case 'F':
cout << "F" << endl;
break;
case '2':
cout << "F2" << endl;
break;
case 'L':
cout << "L" << endl;
break;
case 'R':
cout << "R" << endl;
break;
}
}
}