[유경민] 움직이는 미로 탈출

solution/BOJ_16954_움직이는-미로-구하기/ykm.java

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+import java.io.BufferedReader;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.PriorityQueue;
+import java.util.Queue;
+
+public class Main {
+    static class point implements Comparable<point>{
+        int x, y;
+        int turn;
+
+        public point(int x, int y, int turn){
+            this.x = x;
+            this.y = y;
+            this.turn = turn;
+        }
+
+        @Override
+        public int compareTo(Main.point o) {
+            if(this.turn==o.turn){
+                return o.y - this.y;
+            }
+            return this.turn - o.turn;
+        }
+
+        @Override
+        public String toString() {
+            return "point [turn=" + turn + ", x=" + x + ", y=" + y + "]";
+        }  
+    }
+
+    static String[] map = new String[8];
+    static int[] mx = {0,0,0,-1,-1,-1,1,1,1};
+    static int[] my = {0,-1,1,0,-1, 1,1,0,-1};
+
+    public static void main(String[] args) throws IOException{
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        for(int i = 0 ; i<8; i++){
+            map[i] = br.readLine();
+        }
+
+        Queue<point> q = new PriorityQueue<point>();
+        boolean isArrived = false;
+        q.add(new point(7,0,0));
+
+        int turn = 0;
+        while(!q.isEmpty()){
+            point current = q.poll();
+
+            if(current.x==0 && current.y==7){
+                isArrived = true;
+                break;
+            }
+
+            if(current.turn != turn){
+                turn++;
+                if(turn==8){    // 벽이 다 내려온 상태
+                    isArrived=true;
+                    break;
+                }
+                moveMap();
+            }
+
+            if(!isValidPosition(current)){
+                continue;
+            }
+
+            for(int i = 0; i<9; i++){
+                int nextX = current.x + mx[i];
+                int nextY = current.y + my[i];
+
+                if(nextX<0 || nextY<0 || nextX>=8 || nextY>=8){ // 맵 범위 밖
+                    continue;
+                }
+
+                if(map[nextX].charAt(nextY)=='#'){ // 현재벽이 있는 곳으로는 이동불가
+                    continue;
+                }
+
+                point next = new point(nextX,nextY,current.turn+1);
+                q.add(next); // 같은 위치가 추가 되는 경우가 많음.
+            }
+        }
+
+        if(isArrived){
+            System.out.println(1);
+        }else{
+            System.out.println(0);
+        }
+    }
+
+    private static void moveMap(){ // 매초 map이 아래로 움직임 
+        for(int i = 7; i>0; i--){
+            map[i] = map[i-1];
+        }
+        map[0] = "........";
+    }
+
+    private static boolean isValidPosition(point current){ // 벽이 curPosition에 위치하게 되었는지 확인
+        if(map[current.x].charAt(current.y)=='#'){
+            return false;
+        }
+        return true;
+    }
+}