From 3a2252620b2a695686c88867acb13cb12e5d2554 Mon Sep 17 00:00:00 2001
From: nhimanshujain <nhimanshujain@gmail.com>
Date: Sat, 15 Oct 2022 20:41:00 +0530
Subject: [PATCH] Longest Common Prefix in JAVA

---
 Longest Common Prefix.java | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 Longest Common Prefix.java

diff --git a/Longest Common Prefix.java b/Longest Common Prefix.java
new file mode 100644
index 0000000..5939a85
--- /dev/null
+++ b/Longest Common Prefix.java	
@@ -0,0 +1,25 @@
+public String longestCommonPrefix(String[] strs) {
+    if (strs == null || strs.length == 0) return "";    
+        return longestCommonPrefix(strs, 0 , strs.length - 1);
+}
+
+private String longestCommonPrefix(String[] strs, int l, int r) {
+    if (l == r) {
+        return strs[l];
+    }
+    else {
+        int mid = (l + r)/2;
+        String lcpLeft =   longestCommonPrefix(strs, l , mid);
+        String lcpRight =  longestCommonPrefix(strs, mid + 1,r);
+        return commonPrefix(lcpLeft, lcpRight);
+   }
+}
+
+String commonPrefix(String left,String right) {
+    int min = Math.min(left.length(), right.length());       
+    for (int i = 0; i < min; i++) {
+        if ( left.charAt(i) != right.charAt(i) )
+            return left.substring(0, i);
+    }
+    return left.substring(0, min);
+}
\ No newline at end of file