fix: update solutions

Author: yanglbme

solution/0000-0099/0009.Palindrome Number/README.md

@@ -177,13 +177,12 @@ function isPalindrome(x: number): boolean {
 ```rust
 impl Solution {
     pub fn is_palindrome(mut x: i32) -> bool {
-        if x < 0 || (x % 10 == 0 && x != 0) {
+        if x < 0 || (x != 0 && x % 10 == 0) {
             return false;
         }
         let mut y = 0;
         while x > y {
-            y *= 10;
-            y += x % 10;
+            y = y * 10 + x % 10;
             x /= 10;
         }
         x == y || x == y / 10
@@ -213,17 +212,13 @@ var isPalindrome = function (x) {
 #### C#
 
 ```cs
-public class Solution
-{
-    public bool IsPalindrome(int x)
-    {
-        if (x < 0 || (x > 0 && x % 10 == 0))
-        {
+public class Solution {
+    public bool IsPalindrome(int x) {
+        if (x < 0 || (x > 0 && x % 10 == 0)) {
             return false;
         }
         int y = 0;
-        for (; y < x; x /= 10)
-        {
+        for (; y < x; x /= 10) {
             y = y * 10 + x % 10;
         }
         return x == y || x == y / 10;
@@ -236,14 +231,19 @@ public class Solution
 ```php
 class Solution {
     /**
-     * @param int $x
-     * @return boolean
+     * @param Integer $x
+     * @return Boolean
      */
-
     function isPalindrome($x) {
-        $str = (string) $x;
-        $str_reverse = strrev($str);
-        return $str === $str_reverse;
+        if ($x < 0 || ($x && $x % 10 == 0)) {
+            return false;
+        }
+        $y = 0;
+        while ($x > $y) {
+            $y = $y * 10 + ($x % 10);
+            $x = (int) ($x / 10);
+        }
+        return $x == $y || $x == (int) ($y / 10);
     }
 }
 ```

solution/0000-0099/0009.Palindrome Number/README_EN.md

@@ -169,13 +169,12 @@ function isPalindrome(x: number): boolean {
 ```rust
 impl Solution {
     pub fn is_palindrome(mut x: i32) -> bool {
-        if x < 0 || (x % 10 == 0 && x != 0) {
+        if x < 0 || (x != 0 && x % 10 == 0) {
             return false;
         }
         let mut y = 0;
         while x > y {
-            y *= 10;
-            y += x % 10;
+            y = y * 10 + x % 10;
             x /= 10;
         }
         x == y || x == y / 10
@@ -205,17 +204,13 @@ var isPalindrome = function (x) {
 #### C#
 
 ```cs
-public class Solution
-{
-    public bool IsPalindrome(int x)
-    {
-        if (x < 0 || (x > 0 && x % 10 == 0))
-        {
+public class Solution {
+    public bool IsPalindrome(int x) {
+        if (x < 0 || (x > 0 && x % 10 == 0)) {
             return false;
         }
         int y = 0;
-        for (; y < x; x /= 10)
-        {
+        for (; y < x; x /= 10) {
             y = y * 10 + x % 10;
         }
         return x == y || x == y / 10;
@@ -228,14 +223,19 @@ public class Solution
 ```php
 class Solution {
     /**
-     * @param int $x
-     * @return boolean
+     * @param Integer $x
+     * @return Boolean
      */
-
     function isPalindrome($x) {
-        $str = (string) $x;
-        $str_reverse = strrev($str);
-        return $str === $str_reverse;
+        if ($x < 0 || ($x && $x % 10 == 0)) {
+            return false;
+        }
+        $y = 0;
+        while ($x > $y) {
+            $y = $y * 10 + ($x % 10);
+            $x = (int) ($x / 10);
+        }
+        return $x == $y || $x == (int) ($y / 10);
     }
 }
 ```

solution/0000-0099/0009.Palindrome Number/Solution.cs

@@ -1,14 +1,10 @@
-public class Solution
-{
-    public bool IsPalindrome(int x)
-    {
-        if (x < 0 || (x > 0 && x % 10 == 0))
-        {
+public class Solution {
+    public bool IsPalindrome(int x) {
+        if (x < 0 || (x > 0 && x % 10 == 0)) {
             return false;
         }
         int y = 0;
-        for (; y < x; x /= 10)
-        {
+        for (; y < x; x /= 10) {
             y = y * 10 + x % 10;
         }
         return x == y || x == y / 10;

solution/0000-0099/0009.Palindrome Number/Solution.php

@@ -1,12 +1,17 @@
 class Solution {
     /**
-     * @param int $x
-     * @return boolean
+     * @param Integer $x
+     * @return Boolean
      */
-
     function isPalindrome($x) {
-        $str = (string) $x;
-        $str_reverse = strrev($str);
-        return $str === $str_reverse;
+        if ($x < 0 || ($x && $x % 10 == 0)) {
+            return false;
+        }
+        $y = 0;
+        while ($x > $y) {
+            $y = $y * 10 + ($x % 10);
+            $x = (int) ($x / 10);
+        }
+        return $x == $y || $x == (int) ($y / 10);
     }
 }

solution/0000-0099/0009.Palindrome Number/Solution.rs

@@ -1,20 +1,13 @@
 impl Solution {
-    pub fn is_palindrome(x: i32) -> bool {
-        if x < 0 {
+    pub fn is_palindrome(mut x: i32) -> bool {
+        if x < 0 || (x != 0 && x % 10 == 0) {
             return false;
         }
-        let s = x.to_string();
-        let bs = s.as_bytes();
-        let n = bs.len();
-        let mut l = 0;
-        let mut r = n - 1;
-        while l < r {
-            if bs[l] != bs[r] {
-                return false;
-            }
-            l += 1;
-            r -= 1;
+        let mut y = 0;
+        while x > y {
+            y = y * 10 + x % 10;
+            x /= 10;
         }
-        true
+        x == y || x == y / 10
     }
 }