feat: solved 4179 불

hanbkim/bfs/4179.cpp

@@ -0,0 +1,92 @@
+#include <iostream>
+#include <algorithm>
+#include <queue>
+
+
+int	fire[1001][1001];
+int	jihun[1001][1001];
+int map[1001][1001];
+std::queue<std::pair<int, int> > queue;
+
+int dy[] = {1, -1, 0, 0};
+int dx[] = {0, 0, 1, -1};
+
+int	bfs(int R, int C, int jihun_y, int jihun_x)
+{
+	while (!queue.empty())
+	{
+		auto node = queue.front();
+		queue.pop();
+		for (int i = 0; i < 4; ++i)
+		{
+			int ny = node.first + dy[i];
+			int nx = node.second + dx[i];
+			if (ny < 0 || ny >= R || nx < 0 || nx >= C)
+				continue ;
+			if (map[ny][nx] != '.' || fire[ny][nx] != 0)
+				continue ;
+			queue.push(std::make_pair(ny, nx));	
+			fire[ny][nx] = fire[node.first][node.second] + 1;
+		}
+	}
+
+	queue.push(std::make_pair(jihun_y, jihun_x));
+
+	while (!queue.empty())
+	{
+		auto node = queue.front();
+		std::cout << node.first << " " << node.second << "\n";
+		queue.pop();
+		if (node.first == R - 1 || node.first == 0 || node.second == 0 || node.second == C - 1)
+			return jihun[node.first][node.second];
+		for (int i = 0; i < 4; ++i)
+		{
+			int ny = node.first + dy[i];
+			int nx = node.second + dx[i];
+			if (ny < 0 || ny >= R || nx < 0 || nx >= C)
+				continue ;
+			if (jihun[ny][nx] != 0 || map[ny][nx] != '.')
+				continue;
+			if (fire[ny][nx] != 0 && jihun[node.first][node.second] + 1 >= fire[ny][nx])
+				continue ;
+			queue.push(std::make_pair(ny, nx));	
+			jihun[ny][nx] = jihun[node.first][node.second] + 1;
+		}
+	}
+	return -1;
+}
+
+
+int main()
+{
+	int	R, C;
+
+	std::cin >> R >> C;
+	int jihun_y, jihun_x;
+	for (int i = 0; i < R; ++i)
+	{
+		std::string line;
+		std::cin >> line;
+		for (int j = 0; j < C; ++j)
+		{
+			map[i][j] = line[j];
+			if (map[i][j] == 'J')
+			{
+				jihun_y = i;
+				jihun_x = j;
+				jihun[i][j] = 1;
+			}
+			if (map[i][j] == 'F')
+			{
+				fire[i][j] = 1;
+				queue.push(std::make_pair(i, j));
+			}
+		}
+	}
+	int minute = bfs(R, C, jihun_y, jihun_x);
+
+	if (minute == -1)
+		std::cout << "IMPOSSIBLE";
+	else 
+		std::cout << minute;
+}