[20250929] BOJ / G4 / RGB거리 2 / 김민진

Author: zinnnn37

zinnnn37/202509/29 BOJ G4 RGB거리 2.md

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+```java
+import java.io.*;
+import java.util.Arrays;
+import java.util.StringTokenizer;
+
+public class BJ_17404_RGB거리_2 {
+
+    private static final int INF = 987654321;
+
+    private static final BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    private static final BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+    private static StringTokenizer st;
+
+    private static int N, ans;
+    private static int[][] colors;
+    private static int[][] dp;
+
+    public static void main(String[] args) throws IOException {
+        init();
+        sol();
+    }
+
+    private static void init() throws IOException {
+        N = Integer.parseInt(br.readLine());
+        ans = INF;
+
+        colors = new int[N][3];
+        for (int i = 0; i < N; i++) {
+            st = new StringTokenizer(br.readLine());
+            for (int j = 0; j < 3; j++) {
+                colors[i][j] = Integer.parseInt(st.nextToken());
+            }
+        }
+        dp = new int[N][3];
+    }
+
+    private static void sol() throws IOException {
+        // 시작 색 지정
+        for (int firstColor = 0; firstColor < 3; firstColor++) {
+            Arrays.fill(dp[0], INF);
+
+            dp[0][firstColor] = colors[0][firstColor];
+
+            for (int i = 1; i < N; i++) {
+                dp[i][0] = Math.min(dp[i - 1][1], dp[i - 1][2]) + colors[i][0];
+                dp[i][1] = Math.min(dp[i - 1][0], dp[i - 1][2]) + colors[i][1];
+                dp[i][2] = Math.min(dp[i - 1][0], dp[i - 1][1]) + colors[i][2];
+            }
+
+            for (int lastColor = 0; lastColor < 3; lastColor++) {
+                if (lastColor != firstColor) {
+                    ans = Math.min(ans, dp[N - 1][lastColor]);
+                }
+            }
+        }
+        bw.write(ans + "");
+        bw.flush();
+        bw.close();
+        br.close();
+    }
+
+}
+```