Initial commit

Medium/longest-palindromic-substring/Solution.java

@@ -0,0 +1,28 @@
+class Solution {
+    public String longestPalindrome(String line) {
+        if (line.length() < 2) {
+            return line;
+        } else {
+            int start = 0, size = 0, left = 0, right = 0, middle = 0;
+            while (middle < line.length()) {
+                left = right = middle;
+                while (right < line.length() - 1 && line.charAt(right) == line.charAt(right + 1)) {
+                    ++right;
+                }
+
+                middle = right + 1;
+                while (left > 0 && right < line.length() - 1 && line.charAt(left - 1) == line.charAt(right + 1)) {
+                    --left;
+                    ++right;
+                }
+
+                if (right - left + 1 > size) {
+                    start = left;
+                    size = right - left + 1;
+                }
+            }
+
+            return line.substring(start, start + size);
+        }
+    }
+}