LG4944 Code

LG4944.cpp

#include <algorithm>
#include <cstdio>
#include <iostream>
#include <queue>
#include <vector>

const int maxn = 205;
const int maxk = 105;
const int way[2][4] = {{1, 0, -1, 0}, {0, 1, 0, -1}};

char map[maxn][maxn], cmd[maxn][maxk];
bool vis[maxn][maxn];
int n, m, restFood;

struct node {
    int x, y;
};

class Snake {
   private:
    std::deque<node> body;

    void die(void) {
        live = false;
        len = 0;
        while (!body.empty()) {
            node cac = body.front();
            body.pop_front();
            map[cac.x][cac.y] = '&', restFood++;
        }
        return;
    }

   public:
    Snake(int x, int y, int id) {
        this->id = id;
        len = 0;
        live = true;
        static std::queue<node> que;
        que.push((node){x, y});
        while (!que.empty()) {
            node cac = que.front();
            vis[cac.x][cac.y] = true;
            body.push_back(cac), len++;
            que.pop();
            for (int i = 0; i < 4; i++) {
                int tx = cac.x + way[0][i], ty = cac.y + way[1][i];
                if (tx >= 1 && tx <= n && ty >= 1 && ty <= m &&
                    !vis[tx][ty] && map[tx][ty] == '#') que.push((node){tx, ty});
            }
        }
        return;
    }
    ~Snake(void) {
        body.clear();
        return;
    }

    bool live;
    int id, len;

    void move(char way) {
        node to = body.front();
        map[to.x][to.y] = '#';
        if (way == 'W') to.x--;
        if (way == 'S') to.x++;
        if (way == 'A') to.y--;
        if (way == 'D') to.y++;
        if (to.x < 1 || to.x > n || to.y < 1 || to.y > m ||
            map[to.x][to.y] == '#' || map[to.x][to.y] == '@') return die();
        body.push_front(to), len++;
        if (map[to.x][to.y] == '&') return restFood--, void(map[to.x][to.y] = '@');
        map[to.x][to.y] = '@';
        map[body.back().x][body.back().y] = '.';
        return len--, body.pop_back();
    }

    inline bool operator<(const Snake& oth) const {
        return this->len > oth.len || this->len == oth.len && this->id < oth.id;
    }
};

std::vector<Snake> snakes;

int main() {
    std::ios::sync_with_stdio(false);
    int k, c;
    std::cin >> n >> m >> k;
    restFood = 0;
    for (int i = 1; i <= n; i++)
        for (int j = 1; j <= m; j++) {
            std::cin >> map[i][j];
            if (map[i][j] == '&') restFood++;
        }
    c = 0;
    for (int i = 1; i <= n; i++)
        for (int j = 1; j <= m; j++)
            if (map[i][j] == '@') snakes.push_back((Snake){i, j, ++c});
    for (int i = 0; i < c; i++)
        for (int j = 1; j <= k; j++)
            std::cin >> cmd[i][j];
    for (int tim = 1; tim <= k; tim++)
        for (int p = 0; p < c; p++) {
            if (!snakes[p].live) continue;
            snakes[p].move(cmd[p][tim]);
        }
    std::sort(snakes.begin(), snakes.end());
    for (std::vector<Snake>::iterator i = snakes.begin(); i != snakes.end(); i++)
        std::cout << i->len << ' ' << i->id << std::endl;
    std::cout << restFood << std::endl;
    return 0;
}