[20250226] BOJ / 플래5 / 찾기 / 신희을

ShinHeeEul/202502/26 BOJ P5 찾기.md

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+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+
+	static int[] failure;
+	static int count = 0;
+	static int pLength;
+	static int tLength;
+	static StringBuilder sb;
+
+	public static void main(String[] args) throws IOException {
+		// TODO Auto-generated method stub
+		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+		char[] T = br.readLine().toCharArray();
+		char[] P = br.readLine().toCharArray();
+
+		pLength = P.length;
+		tLength = T.length;
+
+		failure = new int[P.length];
+		sb = new StringBuilder();
+		failureFunction(P);
+		KMP(T, P);
+
+		System.out.println(count);
+		System.out.println(sb);
+	}
+
+	public static void failureFunction(char[] s) {
+
+		int pIdx = 0;
+
+		for(int index = 1; index < pLength; index++) {
+
+			while(pIdx != 0 && s[index] != s[pIdx]) pIdx = failure[pIdx - 1];
+
+			if(s[pIdx] == s[index]) {
+				pIdx++;
+				failure[index] = pIdx;
+			}
+		}
+
+	}
+
+	public static void KMP(char[] t, char[] p) {
+		int pIdx = 0;
+
+		for(int index = 0; index < tLength; index++) {
+
+			while(pIdx != 0 && t[index] != p[pIdx]) pIdx = failure[pIdx - 1];
+
+			if(t[index] == p[pIdx]) {
+				if(pIdx == pLength - 1) {
+					sb.append(index - pLength + 2).append(" ");
+					count++;
+					pIdx = failure[pIdx];
+				} else {
+					pIdx++;
+				}
+			}
+		}
+
+	}
+
+}
+```