Merge pull request #1154 from AlgorithmWithGod/Ukj0ng

[20251017] BOJ / G2 / ㅋㅋ루ㅋㅋ / 한종욱

Author: ShinHeeEul

Ukj0ng/202510/17 BOJ G2 ㅋㅋ루ㅋㅋ.md

@@ -0,0 +1,70 @@
+```
+import java.io.*;
+
+public class Main {
+    private static final BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    private static final BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+    private static char[] input;
+    private static int[] a;
+    private static int total, answer, rCount;
+
+    public static void main(String[] args) throws IOException {
+        init();
+        answer = twoPointer();
+
+        bw.write(answer + "\n");
+        bw.flush();
+        bw.close();
+        br.close();
+    }
+
+    private static void init() throws IOException {
+        input = br.readLine().toCharArray();
+
+        rCount = 0;
+        for (char c : input) {
+            if (c == 'R') rCount++;
+        }
+
+        a = new int[rCount];
+
+        int idx = 0;
+        int kCount = 0;
+
+        for (int i = 0; i < input.length; i++) {
+            if (input[i] == 'K') {
+                total++;
+                kCount++;
+            } else {
+                a[idx++] = kCount;
+            }
+        }
+    }
+
+    private static int twoPointer() {
+        if (rCount == 0) return 0;
+
+        int left = 0;
+        int right = rCount - 1;
+        int max = 0;
+
+        while (left <= right) {
+            int leftK = a[left];
+            int rightK = total - a[right];
+
+            int k = Math.min(leftK, rightK);
+            int r = right - left + 1;
+
+            max = Math.max(max, k * 2 + r);
+
+            if (leftK < rightK) {
+                left++;
+            } else {
+                right--;
+            }
+        }
+
+        return max;
+    }
+}
+```