Submission #968196

#	Time	Username	Problem	Language	Result	Execution time	Memory
968196		ShauryaTheShep	Robots (APIO13_robots)	C++14	0 / 100	1 ms	500 KiB

robots

#include <iostream>
#include <queue>
#include <vector>
#include <tuple>
#include <set>
using namespace std;

const int MAX_W = 10;
const int MAX_H = 10;

char grid[MAX_H][MAX_W];
bool visited[MAX_H][MAX_W][MAX_H][MAX_W];
int w, h;

bool is_inside(int x, int y) {
    return x >= 0 && x < h && y >= 0 && y < w;
}

vector<pair<int, int>> get_moves(int x, int y) {
    vector<pair<int, int>> positions;
    // Directions: Up, Down, Left, Right
    int dx[4] = {-1, 1, 0, 0};
    int dy[4] = {0, 0, -1, 1};
    for (int d = 0; d < 4; ++d) {
        int nx = x, ny = y;
        while (is_inside(nx + dx[d], ny + dy[d]) && grid[nx + dx[d]][ny + dy[d]] != 'x') {
            nx += dx[d];
            ny += dy[d];
        }
        positions.push_back({nx, ny});
    }
    return positions;
}

int bfs(pair<int, int> robot1, pair<int, int> robot2) {
    queue<tuple<int, int, int, int, int>> q;
    q.push({robot1.first, robot1.second, robot2.first, robot2.second, 0});
    visited[robot1.first][robot1.second][robot2.first][robot2.second] = true;

    while (!q.empty()) {
        auto [r1x, r1y, r2x, r2y, moves] = q.front(); q.pop();

        if (r1x == r2x && r1y == r2y) return moves;

        vector<pair<int, int>> moves_r1 = get_moves(r1x, r1y);
        vector<pair<int, int>> moves_r2 = get_moves(r2x, r2y);

        for (auto& [new_r1x, new_r1y] : moves_r1) {
            if (!visited[new_r1x][new_r1y][r2x][r2y]) {
                visited[new_r1x][new_r1y][r2x][r2y] = true;
                q.push({new_r1x, new_r1y, r2x, r2y, moves + 1});
            }
        }

        for (auto& [new_r2x, new_r2y] : moves_r2) {
            if (!visited[r1x][r1y][new_r2x][new_r2y]) {
                visited[r1x][r1y][new_r2x][new_r2y] = true;
                q.push({r1x, r1y, new_r2x, new_r2y, moves + 1});
            }
        }
    }

    return -1; // if no solution
}

int main() {
    cin >> w >> h;
    pair<int, int> robot1, robot2;
    bool first_robot_found = false;

    for (int i = 0; i < h; ++i) {
        for (int j = 0; j < w; ++j) {
            cin >> grid[i][j];
            if (isdigit(grid[i][j])) {
                if (!first_robot_found) {
                    robot1 = {i, j};
                    first_robot_found = true;
                } else {
                    robot2 = {i, j};
                }
            }
        }
    }

    cout << bfs(robot1, robot2) << endl;
    return 0;
}

Compilation message (stderr)

robots.cpp: In function 'int bfs(std::pair<int, int>, std::pair<int, int>)':
robots.cpp:41:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   41 |         auto [r1x, r1y, r2x, r2y, moves] = q.front(); q.pop();
      |              ^
robots.cpp:48:20: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   48 |         for (auto& [new_r1x, new_r1y] : moves_r1) {
      |                    ^
robots.cpp:55:20: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   55 |         for (auto& [new_r2x, new_r2y] : moves_r2) {
      |                    ^

• Subtask 1: 0 / 10
• Subtask 2: 0 / 20
• Subtask 3: 0 / 30
• Subtask 4: 0 / 40