Package g0101_0200.s0165_compare_version_numbers

Class Solution

java.lang.Object

g0101_0200.s0165_compare_version_numbers.Solution

public class Solution
extends Object

165 - Compare Version Numbers.<p>Medium</p> <p>Given two version numbers, <code>version1</code> and <code>version2</code>, compare them.</p> <p>Version numbers consist of <strong>one or more revisions</strong> joined by a dot <code>'.'</code>. Each revision consists of <strong>digits</strong> and may contain leading <strong>zeros</strong>. Every revision contains <strong>at least one character</strong>. Revisions are <strong>0-indexed from left to right</strong> , with the leftmost revision being revision 0, the next revision being revision 1, and so on. For example <code>2.5.33</code> and <code>0.1</code> are valid version numbers.</p> <p>To compare version numbers, compare their revisions in <strong>left-to-right order</strong>. Revisions are compared using their <strong>integer value ignoring any leading zeros</strong>. This means that revisions <code>1</code> and <code>001</code> are considered <strong>equal</strong>. If a version number does not specify a revision at an index, then **treat the revision as <code>0</code> **. For example, version <code>1.0</code> is less than version <code>1.1</code> because their revision 0s are the same, but their revision 1s are <code>0</code> and <code>1</code> respectively, and <code>0 < 1</code>.</p> <p><em>Return the following:</em></p> <ul> <li>If <code>version1 < version2</code>, return <code>-1</code>.</li> <li>If <code>version1 > version2</code>, return <code>1</code>.</li> <li>Otherwise, return <code>0</code>.</li> </ul> <p><strong>Example 1:</strong></p> <p><strong>Input:</strong> version1 = &ldquo;1.01&rdquo;, version2 = &ldquo;1.001&rdquo;</p> <p><strong>Output:</strong> 0</p> <p><strong>Explanation:</strong> Ignoring leading zeroes, both &ldquo;01&rdquo; and &ldquo;001&rdquo; represent the same integer &ldquo;1&rdquo;.</p> <p><strong>Example 2:</strong></p> <p><strong>Input:</strong> version1 = &ldquo;1.0&rdquo;, version2 = &ldquo;1.0.0&rdquo;</p> <p><strong>Output:</strong> 0</p> <p><strong>Explanation:</strong> version1 does not specify revision 2, which means it is treated as &ldquo;0&rdquo;.</p> <p><strong>Example 3:</strong></p> <p><strong>Input:</strong> version1 = &ldquo;0.1&rdquo;, version2 = &ldquo;1.1&rdquo;</p> <p><strong>Output:</strong> -1</p> <p><strong>Explanation:</strong> version1&rsquo;s revision 0 is &ldquo;0&rdquo;, while version2&rsquo;s revision 0 is &ldquo;1&rdquo;. 0 < 1, so version1 < version2.</p> <p><strong>Example 4:</strong></p> <p><strong>Input:</strong> version1 = &ldquo;1.0.1&rdquo;, version2 = &ldquo;1&rdquo;</p> <p><strong>Output:</strong> 1</p> <p><strong>Example 5:</strong></p> <p><strong>Input:</strong> version1 = &ldquo;7.5.2.4&rdquo;, version2 = &ldquo;7.5.3&rdquo;</p> <p><strong>Output:</strong> -1</p> <p><strong>Constraints:</strong></p> <ul> <li><code>1 <= version1.length, version2.length <= 500</code></li> <li><code>version1</code> and <code>version2</code> only contain digits and <code>'.'</code>.</li> <li><code>version1</code> and <code>version2</code> <strong>are valid version numbers</strong>.</li> <li>All the given revisions in <code>version1</code> and <code>version2</code> can be stored in a <strong>32-bit integer</strong>.</li> </ul>

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
int	compareVersion(String version1, String version2)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Solution

public Solution()

Method Details

compareVersion

public int compareVersion(String version1,
 String version2)