From 968dcfd4ffd8d9aff0e617ed8534bb7d8d08c6f5 Mon Sep 17 00:00:00 2001
From: Min <n200127@gmail.com>
Date: Wed, 30 Nov 2022 23:04:29 +0800
Subject: [PATCH 1/6] =?UTF-8?q?=E5=A2=9E=E5=8A=A00005.=E6=9C=80=E9=95=B7?=
 =?UTF-8?q?=E5=9B=9E=E6=96=87=E5=AD=90=E4=B8=B2C#=20=E5=8B=95=E6=85=8B?=
 =?UTF-8?q?=E8=A6=8F=E5=89=87=E7=9A=84=E7=89=88=E6=9C=AC?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 problems/0005.最长回文子串.md | 32 +++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/problems/0005.最长回文子串.md b/problems/0005.最长回文子串.md
index 62c2cbde..84d8d835 100644
--- a/problems/0005.最长回文子串.md
+++ b/problems/0005.最长回文子串.md
@@ -615,6 +615,38 @@ char * longestPalindrome(char * s){
 }
 ```
 
+C#：
+
+動態規則：
+```c#
+public class Solution {
+    
+    public string LongestPalindrome(string s) {
+        bool[,] dp = new bool[s.Length, s.Length];
+        int maxlenth = 0;
+        int left = 0;
+        int right = 0;
+        for(int i = s.Length-1 ; i>=0; i--){
+            for(int j = i; j <s.Length;j++){
+                if(s[i] == s[j]){
+                    if(j - i <= 1){ // 情况一和情况二
+                        dp[i, j] = true;
+                    }else if( dp[i+1, j-1] ){ // 情况三
+                        dp[i, j] = true;
+                    }
+                }
+                if(dp[i, j] && j-i+1 > maxlenth){
+                    maxlenth = j-i+1;
+                    left = i;
+                    right = j;
+                }
+            }
+        }
+        return s.Substring(left, maxlenth);
+    }
+}
+```
+
 <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"/>

From aae0de9b8a69f25b8379b36caf37459f999d2c08 Mon Sep 17 00:00:00 2001
From: Min <n200127@gmail.com>
Date: Wed, 30 Nov 2022 23:11:47 +0800
Subject: [PATCH 2/6] =?UTF-8?q?=E5=A2=9E=E5=8A=A00005.=E6=9C=80=E9=95=B7?=
 =?UTF-8?q?=E5=9B=9E=E6=96=87=E5=AD=90=E4=B8=B2C#=20=E9=9B=99=E6=8C=87?=
 =?UTF-8?q?=E9=87=9D=E7=9A=84=E7=89=88=E6=9C=AC?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 problems/0005.最长回文子串.md | 30 +++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/problems/0005.最长回文子串.md b/problems/0005.最长回文子串.md
index 84d8d835..4d48f184 100644
--- a/problems/0005.最长回文子串.md
+++ b/problems/0005.最长回文子串.md
@@ -647,6 +647,36 @@ public class Solution {
 }
 ```
 
+雙指針：
+```C#
+public class Solution {
+    int maxlenth = 0;
+    int left = 0;
+    int right = 0;
+    
+    public string LongestPalindrome(string s) {
+         int result = 0;
+        for (int i = 0; i < s.Length; i++) {
+            extend(s, i, i, s.Length); // 以i為中心
+            extend(s, i, i + 1, s.Length); // 以i和i+1為中心
+        }
+        return s.Substring(left, maxlenth);
+    }
+    
+    private void extend(string s, int i, int j, int n) {
+        while (i >= 0 && j < n && s[i] == s[j]) {
+            if (j - i + 1 > maxlenth) {
+                left = i;
+                right = j;
+                maxlenth = j - i + 1;
+            }
+            i--;
+            j++;
+        }
+    }
+}
+```
+
 <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"/>

From 8e392449be894df8cf3d6b4de1a5b629963ea790 Mon Sep 17 00:00:00 2001
From: Min <n200127@gmail.com>
Date: Wed, 30 Nov 2022 23:04:29 +0800
Subject: [PATCH 3/6] =?UTF-8?q?=E5=A2=9E=E5=8A=A00005.=E6=9C=80=E9=95=B7?=
 =?UTF-8?q?=E5=9B=9E=E6=96=87=E5=AD=90=E4=B8=B2C#=20=E5=8B=95=E6=85=8B?=
 =?UTF-8?q?=E8=A6=8F=E5=89=87=E7=9A=84=E7=89=88=E6=9C=AC?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 problems/0005.最长回文子串.md | 32 +++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/problems/0005.最长回文子串.md b/problems/0005.最长回文子串.md
index 62c2cbde..84d8d835 100644
--- a/problems/0005.最长回文子串.md
+++ b/problems/0005.最长回文子串.md
@@ -615,6 +615,38 @@ char * longestPalindrome(char * s){
 }
 ```
 
+C#：
+
+動態規則：
+```c#
+public class Solution {
+    
+    public string LongestPalindrome(string s) {
+        bool[,] dp = new bool[s.Length, s.Length];
+        int maxlenth = 0;
+        int left = 0;
+        int right = 0;
+        for(int i = s.Length-1 ; i>=0; i--){
+            for(int j = i; j <s.Length;j++){
+                if(s[i] == s[j]){
+                    if(j - i <= 1){ // 情况一和情况二
+                        dp[i, j] = true;
+                    }else if( dp[i+1, j-1] ){ // 情况三
+                        dp[i, j] = true;
+                    }
+                }
+                if(dp[i, j] && j-i+1 > maxlenth){
+                    maxlenth = j-i+1;
+                    left = i;
+                    right = j;
+                }
+            }
+        }
+        return s.Substring(left, maxlenth);
+    }
+}
+```
+
 <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"/>

From d39ae16d2bca3e6e9b7b4ad0c2810ad4fdff5b81 Mon Sep 17 00:00:00 2001
From: Min <n200127@gmail.com>
Date: Wed, 30 Nov 2022 23:11:47 +0800
Subject: [PATCH 4/6] =?UTF-8?q?=E5=A2=9E=E5=8A=A00005.=E6=9C=80=E9=95=B7?=
 =?UTF-8?q?=E5=9B=9E=E6=96=87=E5=AD=90=E4=B8=B2C#=20=E9=9B=99=E6=8C=87?=
 =?UTF-8?q?=E9=87=9D=E7=9A=84=E7=89=88=E6=9C=AC?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 problems/0005.最长回文子串.md | 30 +++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/problems/0005.最长回文子串.md b/problems/0005.最长回文子串.md
index 84d8d835..4d48f184 100644
--- a/problems/0005.最长回文子串.md
+++ b/problems/0005.最长回文子串.md
@@ -647,6 +647,36 @@ public class Solution {
 }
 ```
 
+雙指針：
+```C#
+public class Solution {
+    int maxlenth = 0;
+    int left = 0;
+    int right = 0;
+    
+    public string LongestPalindrome(string s) {
+         int result = 0;
+        for (int i = 0; i < s.Length; i++) {
+            extend(s, i, i, s.Length); // 以i為中心
+            extend(s, i, i + 1, s.Length); // 以i和i+1為中心
+        }
+        return s.Substring(left, maxlenth);
+    }
+    
+    private void extend(string s, int i, int j, int n) {
+        while (i >= 0 && j < n && s[i] == s[j]) {
+            if (j - i + 1 > maxlenth) {
+                left = i;
+                right = j;
+                maxlenth = j - i + 1;
+            }
+            i--;
+            j++;
+        }
+    }
+}
+```
+
 <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"/>

From e75f76466952eb9091334c05bb1bf0cba8b16329 Mon Sep 17 00:00:00 2001
From: Min <n200127@gmail.com>
Date: Wed, 30 Nov 2022 23:04:29 +0800
Subject: [PATCH 5/6] =?UTF-8?q?=E5=A2=9E=E5=8A=A00005.=E6=9C=80=E9=95=B7?=
 =?UTF-8?q?=E5=9B=9E=E6=96=87=E5=AD=90=E4=B8=B2C#=20=E5=8B=95=E6=85=8B?=
 =?UTF-8?q?=E8=A6=8F=E5=89=87=E7=9A=84=E7=89=88=E6=9C=AC?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 problems/0005.最长回文子串.md | 32 +++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/problems/0005.最长回文子串.md b/problems/0005.最长回文子串.md
index 62c2cbde..84d8d835 100644
--- a/problems/0005.最长回文子串.md
+++ b/problems/0005.最长回文子串.md
@@ -615,6 +615,38 @@ char * longestPalindrome(char * s){
 }
 ```
 
+C#：
+
+動態規則：
+```c#
+public class Solution {
+    
+    public string LongestPalindrome(string s) {
+        bool[,] dp = new bool[s.Length, s.Length];
+        int maxlenth = 0;
+        int left = 0;
+        int right = 0;
+        for(int i = s.Length-1 ; i>=0; i--){
+            for(int j = i; j <s.Length;j++){
+                if(s[i] == s[j]){
+                    if(j - i <= 1){ // 情况一和情况二
+                        dp[i, j] = true;
+                    }else if( dp[i+1, j-1] ){ // 情况三
+                        dp[i, j] = true;
+                    }
+                }
+                if(dp[i, j] && j-i+1 > maxlenth){
+                    maxlenth = j-i+1;
+                    left = i;
+                    right = j;
+                }
+            }
+        }
+        return s.Substring(left, maxlenth);
+    }
+}
+```
+
 <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"/>

From 4621def631c57ff5fe0c360185268fd9813b71b2 Mon Sep 17 00:00:00 2001
From: Min <n200127@gmail.com>
Date: Wed, 30 Nov 2022 23:11:47 +0800
Subject: [PATCH 6/6] =?UTF-8?q?=E5=A2=9E=E5=8A=A00005.=E6=9C=80=E9=95=B7?=
 =?UTF-8?q?=E5=9B=9E=E6=96=87=E5=AD=90=E4=B8=B2C#=20=E9=9B=99=E6=8C=87?=
 =?UTF-8?q?=E9=87=9D=E7=9A=84=E7=89=88=E6=9C=AC?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 problems/0005.最长回文子串.md | 30 +++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/problems/0005.最长回文子串.md b/problems/0005.最长回文子串.md
index 84d8d835..4d48f184 100644
--- a/problems/0005.最长回文子串.md
+++ b/problems/0005.最长回文子串.md
@@ -647,6 +647,36 @@ public class Solution {
 }
 ```
 
+雙指針：
+```C#
+public class Solution {
+    int maxlenth = 0;
+    int left = 0;
+    int right = 0;
+    
+    public string LongestPalindrome(string s) {
+         int result = 0;
+        for (int i = 0; i < s.Length; i++) {
+            extend(s, i, i, s.Length); // 以i為中心
+            extend(s, i, i + 1, s.Length); // 以i和i+1為中心
+        }
+        return s.Substring(left, maxlenth);
+    }
+    
+    private void extend(string s, int i, int j, int n) {
+        while (i >= 0 && j < n && s[i] == s[j]) {
+            if (j - i + 1 > maxlenth) {
+                left = i;
+                right = j;
+                maxlenth = j - i + 1;
+            }
+            i--;
+            j++;
+        }
+    }
+}
+```
+
 <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"/>