Add FZOI Codes

FZOI/回文数个数.cpp

@@ -0,0 +1,33 @@
+#include <iostream>
+#include <string>
+
+using namespace std;
+
+bool isPalindrome(int num) {
+    string str = to_string(num);
+    int left = 0, right = str.length() - 1;
+    while (left < right) {
+        if (str[left] != str[right]) {
+            return false;
+        }
+        left++;
+        right--;
+    }
+    return true;
+}
+
+int main() {
+    int n;
+    cin >> n;
+
+    int count = 0;
+    for (int i = 1; i <= n; i++) {
+        if (isPalindrome(i)) {
+            count++;
+        }
+    }
+
+    cout << count << endl;
+
+    return 0;
+}