[20250213] BOJ / 골드3 / 케익 배달 / 김수연

Author: suyeun84

suyeun84/202502/13 BOJ G3 케익 배달.md

@@ -0,0 +1,60 @@
+```java
+import java.util.*;
+import java.io.*;
+
+class Solution
+{
+	public static void main(String[] args) throws Exception{
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        StringTokenizer st = new StringTokenizer(br.readLine());
+        
+        int N = Integer.parseInt(st.nextToken());
+        ArrayList<Position> target = new ArrayList<>();
+        long[][] dp = new long[N+1][5]; // 0:정위치 1:북 2:동 3:남 4:서
+        int[][] dir = new int[][] {{0,0}, {-1,0}, {0,1}, {1,0}, {0,-1}};
+        long answer = Long.MAX_VALUE;
+        
+        for (int i = 0; i< N+1; i++) {
+        	st = new StringTokenizer(br.readLine());
+        	target.add(new Position(Integer.parseInt(st.nextToken()), Integer.parseInt(st.nextToken())));
+        	Arrays.fill(dp[i], Long.MAX_VALUE);
+        }
+        for (int i = 0 ; i < 5; i++) {
+        	if (i == 0) {
+        		dp[0][0] = 0;
+        	} else {
+        		dp[0][i] = 1;
+        	}
+        }
+
+        for (int i = 1; i < N+1; i++) {
+        	for (int j = 0; j < 5; j++) {
+        		//이전꺼 위치
+        		int y = target.get(i-1).y + dir[j][0];
+        		int x = target.get(i-1).x + dir[j][1];
+        		for (int z = 0; z < 5; z++) {
+        			//이번꺼 위치
+        			int ty = target.get(i).y + dir[z][0];
+            		int tx = target.get(i).x + dir[z][1];
+        			//목표 위치의 상하좌우
+        			dp[i][z] = Math.min(dp[i][z], Math.abs(y-ty)+Math.abs(x-tx)+dp[i-1][j]);
+        		}
+        	}
+        }
+        for (int i = 0; i < 5; i++) {
+        	answer = Math.min(answer, dp[N][i]);
+        }
+        System.out.println(answer);
+	}
+	
+	static class Position {
+		int y;
+		int x;
+		public Position(int y, int x) {
+			this.y = y;
+			this.x = x;
+		}
+	}
+}
+
+```