Submission #1043113

#	Time	Username	Problem	Language	Result	Execution time	Memory
1043113		biank	Maze (JOI23_ho_t3)	C++14	0 / 100	1 ms	456 KiB

Main

#include <bits/stdc++.h>
 
using namespace std;
 
#define sz(x) int(x.size())

const int INF = 1e9;

using ii = pair<int, int>;

queue<ii> q;
int h, w;
vector<string> g;
vector<vector<bool>> vis;

void push(int x, int y) {
    vis[x][y] = true;
    q.emplace(x, y);
}

void expand(string colors, vector<ii> moves, int distance = INF) {
    while (!q.empty() && distance--) {
        int s = sz(q);
        queue<ii> copy = q;
        while (s--) {
            auto [x, y] = q.front();
            q.pop();
            for (auto [dx, dy] : moves) {
                int nx = x + dx, ny = y + dy;
                if (nx >= 0 && nx < h && ny >= 0 && ny < w && !vis[nx][ny]) {
                    bool valid = false;
                    for (char c : colors) if (g[nx][ny] == c) valid = true;
                    if (valid) push(nx, ny);
                }
            }
        }
        if (q.empty()) {
            q = copy;
            break;
        }
    }
}

const vector<ii> ALL_MOVES = {{0, 1}, {0, -1}, {1, 0}, {-1, 0}};
const vector<ii> VERTICAL = {{0, 1}, {0, -1}};
const vector<ii> HORIZONTAL = {{1, 0}, {-1, 0}};

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    
    int k, s_r, s_c, g_r, g_c;
    cin >> h >> w >> k >> s_r >> s_c >> g_r >> g_c;
    --s_r, --s_c, --g_r, --g_c;
    g.resize(h);
    vis.assign(h, vector<bool>(w, false));
    for (int i = 0; i < h; i++) cin >> g[i];
    push(s_r, s_c);
    expand(".", ALL_MOVES);
    int ops = 0;
    while (!vis[g_r][g_c]) {
        expand("#", ALL_MOVES, 1);
        expand(".#", VERTICAL, k - 1);
        expand(".#", HORIZONTAL, k - 1);
        expand(".", ALL_MOVES);
        ops++;
    }
    cout << ops << '\n';
    
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'void expand(std::string, std::vector<std::pair<int, int> >, int)':
Main.cpp:26:18: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   26 |             auto [x, y] = q.front();
      |                  ^
Main.cpp:28:23: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   28 |             for (auto [dx, dy] : moves) {
      |                       ^

• Subtask 1: 0 / 8
• Subtask 2: 0 / 19
• Subtask 3: 0 / 16
• Subtask 4: 0 / 19
• Subtask 5: 0 / 5
• Subtask 6: 0 / 19
• Subtask 7: 0 / 8
• Subtask 8: 0 / 6