From 84b4f2674436910c87e258b5984b1404591bc060 Mon Sep 17 00:00:00 2001
From: fw_qaq <82551626+Jack-Zhang-1314@users.noreply.github.com>
Date: Tue, 25 Oct 2022 22:17:21 +0800
Subject: [PATCH] =?UTF-8?q?update=2028.=E6=89=BE=E5=87=BA=E5=AD=97?=
 =?UTF-8?q?=E7=AC=A6=E4=B8=B2=E4=B8=AD=E7=AC=AC=E4=B8=80=E4=B8=AA=E5=8C=B9?=
 =?UTF-8?q?=E9=85=8D=E9=A1=B9=E7=9A=84=E4=B8=8B=E6=A0=87=20about?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 problems/0028.实现strStr.md | 47 +++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/problems/0028.实现strStr.md b/problems/0028.实现strStr.md
index 7078738e..697e8c2d 100644
--- a/problems/0028.实现strStr.md
+++ b/problems/0028.实现strStr.md
@@ -1299,6 +1299,53 @@ impl Solution {
 }
 ```
 
+> 前缀表统一减一
+
+```rust
+impl Solution {
+    pub fn get_next(mut next: Vec<i32>, s: &Vec<char>) -> Vec<i32> {
+        let mut j = -1;
+        for i in 1..s.len() {
+            while j >= 0 && s[(j + 1) as usize] != s[i] {
+                j = next[j as usize];
+            }
+            if s[i] == s[(j + 1) as usize] {
+                j += 1;
+            }
+            next[i] = j;
+        }
+        next
+    }
+    pub fn str_str(haystack: String, needle: String) -> i32 {
+        if needle.is_empty() {
+            return 0;
+        }
+        if haystack.len() < needle.len() {
+            return -1;
+        }
+        let (haystack_chars, needle_chars) = (
+            haystack.chars().collect::<Vec<char>>(),
+            needle.chars().collect::<Vec<char>>(),
+        );
+        let mut j = -1;
+        let mut next = vec![-1; needle.len()];
+        next = Self::get_next(next, &needle_chars);
+        for (i, v) in haystack_chars.into_iter().enumerate() {
+            while j >= 0 && v != needle_chars[(j + 1) as usize] {
+                j = next[j as usize];
+            }
+            if v == needle_chars[(j + 1) as usize] {
+                j += 1;
+            }
+            if j == needle_chars.len() as i32 - 1 {
+                return (i - needle_chars.len() + 1) as i32;
+            }
+        }
+        -1
+    }
+}
+```
+
 <p align="center">
 <a href="https://programmercarl.com/other/kstar.html" target="_blank">
   <img src="../pics/网站星球宣传海报.jpg" width="1000"/>