[20250916] BOJ / P4 / 개구리 공주 / 이종환

0224LJH/202509/16 BOJ 개구리공주.md

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+```java
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.*;
+
+public class Main {
+
+
+	static HashMap<Integer,TreeSet<Plant>> sumMap = new HashMap<>(); // X+Y가 같은 애들끼리. 여기선 차이가 줄 기준
+	static HashMap<Integer,TreeSet<Plant>> diffMap = new HashMap<>();// X-Y가 같은 애들끼리. 여기선 합이 클수록 뒤.
+	static Plant[] plants;
+	static int[] dy = {1,-1,1,-1};
+	static int[] dx = {1,1,-1,-1};
+	static int[] jumpDir; // 한글자 받아서 -'A'로 int로 바꿔서 저장
+
+	static int plantCnt, jumpCnt,ansX,ansY;
+
+	static final int DIFF_PLUS = 0;
+	static final int SUM_PLUS = 1;
+	static final int SUM_MINUS = 2;
+	static final int DIFF_MINUS = 3;
+
+	static class Plant{
+		int x,y,diff,sum;
+
+		public Plant(int x, int y) {
+			this.x = x;
+			this.y = y;
+			this.diff = x-y;
+			this.sum = x+y;
+		}
+
+		public void remove() {
+			sumMap.get(sum).remove(this);
+			diffMap.get(diff).remove(this);
+		}
+	}
+
+    public static void main(String[] args) throws NumberFormatException, IOException {
+		init();
+		process();
+		print();
+    }
+
+    public static void init() throws NumberFormatException, IOException {
+    	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    	StringTokenizer st = new StringTokenizer(br.readLine());
+    	plantCnt = Integer.parseInt(st.nextToken());
+    	jumpCnt = Integer.parseInt(st.nextToken());
+    	ansX = -1;
+    	ansY = -1;
+
+    	plants = new Plant[plantCnt];
+    	jumpDir = new int[jumpCnt];
+
+    	String input = br.readLine();
+    	for (int i = 0; i < jumpCnt; i++) {
+    		jumpDir[i] = input.charAt(i) - 'A';
+    	}
+
+    	for (int i = 0; i < plantCnt; i++) {
+    		st = new StringTokenizer(br.readLine());
+    		int x = Integer.parseInt(st.nextToken());
+    		int y = Integer.parseInt(st.nextToken());
+
+    		plants[i] = new Plant(x,y);
+
+
+
+    	}
+
+
+    }
+
+    public static void process() { 	
+    	for (int i = 0; i < plantCnt; i++) {
+    		Plant p = plants[i];
+    		addToMap(p);
+    	}
+
+    	Plant cur = plants[0];
+
+    	for (int i = 0; i< jumpCnt; i++) {
+    		int dir = jumpDir[i];
+
+    		TreeSet<Plant> sumTree = sumMap.get(cur.sum);
+    		TreeSet<Plant> diffTree = diffMap.get(cur.diff);
+    		Plant temp = null;
+
+    		switch(dir) {
+				case(SUM_PLUS):
+					temp = sumTree.higher(cur);
+					break;
+				case(SUM_MINUS):
+					temp = sumTree.lower(cur);
+					break;
+				case(DIFF_PLUS):
+					temp = diffTree.higher(cur);
+					break;
+				case(DIFF_MINUS):
+					temp = diffTree.lower(cur);
+					break;
+    		}
+
+    		if (temp == null) continue;
+
+    		cur.remove();
+    		cur = temp;
+
+    	}
+
+    	ansX = cur.x;
+    	ansY = cur.y;
+
+    }
+
+
+    private static void addToMap(Plant p) {
+    	if (!sumMap.containsKey(p.sum)) {
+    		sumMap.put(p.sum, new TreeSet<Plant>((p1,p2) -> p1.diff-p2.diff));
+    	}
+    	sumMap.get(p.sum).add(p);
+
+
+    	if (!diffMap.containsKey(p.diff)) {
+    		diffMap.put(p.diff, new TreeSet<Plant>((p1,p2) -> p1.sum-p2.sum));
+    	} 
+		diffMap.get(p.diff).add(p);
+
+	}
+
+	public static void print() {
+    	System.out.println(ansX + " " + ansY);
+    }
+}
+```