Add solution 165.

Author: javadev

src/Algorithms/0165.compare-version-numbers/compare-version-numbers.php

@@ -0,0 +1,24 @@
+class Solution {
+
+    /**
+     * @param String $version1
+     * @param String $version2
+     * @return Integer
+     */
+    function compareVersion($v1, $v2) {
+        $i1 = 0; $i2 = 0; $n1 = 0; $n2 = 0;
+        while ($i1 < strlen($v1) || $i2 < strlen($v2)) {
+            while ($i1 < strlen($v1) && $v1[$i1] != '.') {
+                $n1 = $n1 * 10 + ord($v1[$i1++]) - ord('0');
+            }
+            while ($i2 < strlen($v2) && $v2[$i2] != '.') {
+                $n2 = $n2 * 10 + ord($v2[$i2++]) - ord('0');
+            }
+            if ($n1 > $n2) return 1;
+            if ($n1 < $n2) return -1;
+            $n1 = $n2 = 0;
+            $i1++; $i2++;
+        }
+        return 0;
+    }
+}