[20250508] BOJ / G4 / 문자열 폭발 / 이강현

Author: lkhyun

lkhyun/202505/08 BOJ G4 문자열 폭발.md

@@ -0,0 +1,52 @@
+```java
+
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    static BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+    static StringTokenizer st;
+    static int[] p;
+
+    public static void main(String[] args) throws IOException{
+        char[] str = br.readLine().toCharArray();
+        char[] pattern = br.readLine().toCharArray();
+        p = new int[pattern.length];
+
+        for (int i = 1,j = 0; i < pattern.length; i++) {
+            while(j>0 && pattern[i] != pattern[j]){
+                j = p[j-1];
+            }
+            if(pattern[i] == pattern[j]){
+                p[i] = ++j;
+            }
+        }
+        char[] res = new char[str.length];
+        int[] len = new int[str.length];
+        int ptr = 0;
+        for (int i = 0,j; i < str.length; i++) {
+            res[ptr] = str[i];
+            j = (ptr == 0) ? 0 : len[ptr-1];
+            while(j>0 && str[i] != pattern[j]){
+                j = p[j-1];
+            }
+            if(str[i] == pattern[j]) {
+                j++;
+            }
+            len[ptr] = j;
+            ptr++;
+
+            if(j == pattern.length){
+                ptr -= j;
+            }
+        }
+        if(ptr == 0){
+            bw.write("FRULA");
+        }else{
+            bw.write(new String(res,0,ptr));
+        }
+        bw.close();
+    }
+}
+```