feat: 9_palindrome_number

tmp

9_palindrome_number/main.cpp

@@ -0,0 +1,19 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+class Solution {
+public:
+    bool isPalindrome(int x) {
+        if (x < 0) return false;
+
+        string num = to_string(x);
+        int len = num.length();
+        for (int i = 0; i < len / 2; i++) {
+            if (num[i] != num[len - i - 1]) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+};