백준 4179번 불! C++

출처 : https://www.acmicpc.net/problem/4179

 

https://kjhcocomi.tistory.com/301 

백준 5427번 불 C++

이문제랑 거의 똑같다.

 

#include <iostream>
#include <string>
#include <vector>
#include <math.h>
#include <algorithm>
#include <utility>
#include <stack>
#include <queue>
#include <math.h>
#include <set>
#include <map>
#include <list>
#include <unordered_map>
#include <unordered_set>
#include <iomanip>
#include <limits.h>

using namespace std;
using int64 = long long;

int r, c;
vector<vector<char>> board;
vector<vector<bool>> found;

int dRow[4] = { -1,0,1,0 };
int dCol[4] = { 0,1,0,-1 };

enum Type {
    Player,
    Fire
};

struct Info {
    int row;
    int col;
    int moveCnt;
    Type type;
};

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);

    cin >> r >> c;
    board = vector<vector<char>>(r, vector<char>(c));
    found = vector<vector<bool>>(r, vector<bool>(c, false));
    vector<pair<int, int>> fire;
    pair<int, int> start;
    for (int i = 0; i < r; i++) {
        for (int j = 0; j < c; j++) {
            cin >> board[i][j];
            if (board[i][j] == 'F')
                fire.push_back({ i,j });
            else if (board[i][j] == 'J')
                start = { i,j };
        }
    }
    queue<Info> q;
    for (auto a : fire) {
        q.push({ a.first,a.second,0,Fire });
    }
    q.push({ start.first,start.second,0,Player });
    found[start.first][start.second] = true;
    int ans = -1;
    bool loop = true;
    while (!q.empty()) {
        auto curr = q.front();
        q.pop();
        for (int i = 0; i < 4; i++) {
            int nextRow = curr.row + dRow[i];
            int nextCol = curr.col + dCol[i];
            if (nextRow < 0 || nextRow >= r || nextCol < 0 || nextCol >= c) {
                if (curr.type == Player) {
                    ans = curr.moveCnt + 1;
                    loop = false;
                    break;
                }
                continue;
            }
            if (board[nextRow][nextCol] == '#') continue;
            if (board[nextRow][nextCol] == 'F') continue;
            if (curr.type == Fire) board[nextRow][nextCol] = 'F';
            else {
                if (found[nextRow][nextCol]) continue;
                found[nextRow][nextCol] = true;
            }
            q.push({ nextRow,nextCol,curr.moveCnt + 1,curr.type });
        }
        if (!loop) break;
    }
    if (ans == -1) cout << "IMPOSSIBLE";
    else cout << ans;
    cout << "\n";
}