[Week03] BOJ 14053: 로봇청소기

weekly/week03/BOJ_14503_로봇청소기/JAEHEE25.java

@@ -0,0 +1,84 @@
+package week03.BOJ_14503_로봇청소기;
+
+import java.util.*;
+import java.lang.*;
+import java.io.*;
+
+class BOJ14503 {
+    static int answer = 0;
+    static int N;
+    static int M;
+    static int[][] room;
+    static int[] dx = {-1, 0, 1, 0}; //북동남서
+    static int[] dy = {0, 1, 0, -1};
+    static final int DIRTY = 0;
+    static final int WALL = 1;
+    static final int CLEANED = 2;
+
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        StringTokenizer st = new StringTokenizer(br.readLine());
+        N = Integer.parseInt(st.nextToken());
+        M = Integer.parseInt(st.nextToken());
+
+        st = new StringTokenizer(br.readLine());
+        int rx = Integer.parseInt(st.nextToken());
+        int ry = Integer.parseInt(st.nextToken());
+        int d = Integer.parseInt(st.nextToken());
+
+        room = new int[N][M];
+        for (int i = 0; i < N; i++) {
+            st = new StringTokenizer(br.readLine());
+            for (int j = 0; j < M; j++) {
+                room[i][j] = Integer.parseInt(st.nextToken());
+            }
+        }
+
+        clean(rx, ry, d);
+        System.out.println(answer);
+    }
+
+    static void clean(int rx, int ry, int d) {
+        if (room[rx][ry] == DIRTY) { //현재 칸 청소
+            room[rx][ry] = CLEANED;
+            answer++;
+        }
+
+        if (hasDirty(rx, ry)) { //주변 4칸에 청소되지 않은 칸이 있다면
+            int nd = d == 0 ? 3 : d - 1; //반시계 방향으로 90도 회전
+            int nx = rx + dx[nd];
+            int ny = ry + dy[nd];
+            if (isValid(nx, ny) && room[nx][ny] == DIRTY) {
+                clean(nx, ny, nd);
+            } else {
+                clean(rx, ry, nd);
+            }
+
+        } else { //없다면
+            //후진했을 때 좌표
+            int nx = rx + (-1) * dx[d];
+            int ny = ry + (-1) * dy[d];
+            if (isValid(nx, ny) && room[nx][ny] != WALL) {
+                clean(nx, ny, d);
+            } else {
+                return;
+            }
+        }
+    }
+
+    static boolean hasDirty(int rx, int ry) {
+        for (int i = 0; i < 4; i++) {
+            int nx = rx + dx[i];
+            int ny = ry + dy[i];
+            if (isValid(nx, ny) && room[nx][ny] == DIRTY) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    static boolean isValid(int x, int y) {
+        return x >= 0 && x < N && y >= 0 && y < M;
+    }
+
+}

weekly/week03/BOJ_6603_로또/JAEHEE25.java

@@ -1,8 +1,10 @@
+package week03.BOJ_6603_로또;
+
 import java.util.*;
 import java.lang.*;
 import java.io.*;
 
-class Main {
+class BOJ6603 {
     static StringBuilder sb = new StringBuilder();
     static int k;
     static int[] numbers;