solve problem

Author: delight010

palindromic-substrings/delight010.swift

@@ -0,0 +1,33 @@
+class Solution {
+    func countSubstrings(_ s: String) -> Int {
+        let charArray = Array(s)
+        var count = 0
+        
+        for i in 0..<charArray.count {
+            count += countPalindrome(charArray, i, i)
+            count += countPalindrome(charArray, i, i + 1)
+        }
+        
+        return count
+    }
+    
+    private func countPalindrome(_ s: [Character], _ left: Int, _ right: Int) -> Int {
+        var left = left
+        var right = right
+        var count = 0
+        
+        while left >= 0 && right < s.count {
+            if s[left] == s[right] {
+                count += 1
+            } else {
+                break
+            }
+            
+            left -= 1
+            right += 1
+        }
+        
+        return count
+    }
+}
+