同学发我的，不知道有没有病毒

#include <iostream>
#include <vector>
#include <conio.h>
const int WORLD_SIZE = 10;
enum Block {
 AIR = 0, 
STONE = 1, 
DIRT = 2 
};
class World {
public:
World() {
    for (int x = 0; x < WORLD_SIZE; ++x) {

        for (int y = 0; y < WORLD_SIZE; ++y) {

            for (int z = 0; z < WORLD_SIZE; ++z) {

                if (x == 0 || x == WORLD_SIZE - 1 || y == 0 || y == WORLD_SIZE - 1 || z == 0 || z == WORLD_SIZE - 1) {

                    blocks[x][y][z] = STONE; 

                } else {

                    blocks[x][y][z] = DIRT; 

                }

            }

        }

    }

}
Block getBlock(int x, int y, int z) {

    return blocks[x][y][z];

}
private:
std::vector<std::vector<std::vector<Block>>> blocks;
};
class Player {
public:
Player() : x(0), y(0), z(0) {}
void move(char direction) {

    switch (direction) {

        case 'w': --z; break;

        case 's': ++z; break;

        case 'a': --x; break;

        case 'd': ++x; break;

        default: break;

    }
    x = std::max(0, std::min(x, WORLD_SIZE - 1));

    y = std::max(0, std::min(y, WORLD_SIZE - 1));

    z = std::max(0, std::min(z, WORLD_SIZE - 1));

}
void getPosition(int& outX, int& outY, int& outZ) {

    outX = x;

    outY = y;

    outZ = z;

}
private:
int x, y, z;
};
int main() {
World world;

Player player;

while (true) {
    system("cls");
    int x, y, z;
    player.getPosition(x, y, z);
    for (int i = -1; i <= 1; ++i) {

        for (int j = -1; j <= 1; ++j) {

            Block block = world.getBlock(x + i, y + j, z);

            switch (block) {

                case STONE: std::cout << "#"; break;

                case DIRT: std::cout << "."; break;

                case AIR: std::cout << " "; break;

            }

        }

        std::cout << std::endl;

    }

    char direction = _getch();

    player.move(direction);

}

return 0;
}