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37 lines
1.6 KiB
HTML
37 lines
1.6 KiB
HTML
<p>A password is considered strong if the below conditions are all met:</p>
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<ul>
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<li>It has at least <code>6</code> characters and at most <code>20</code> characters.</li>
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<li>It contains at least <strong>one lowercase</strong> letter, at least <strong>one uppercase</strong> letter, and at least <strong>one digit</strong>.</li>
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<li>It does not contain three repeating characters in a row (i.e., <code>"...aaa..."</code> is weak, but <code>"...aa...a..."</code> is strong, assuming other conditions are met).</li>
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</ul>
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<p>Given a string <code>password</code>, return <em>the minimum number of steps required to make <code>password</code> strong. if <code>password</code> is already strong, return <code>0</code>.</em></p>
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<p>In one step, you can:</p>
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<ul>
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<li>Insert one character to <code>password</code>,</li>
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<li>Delete one character from <code>password</code>, or</li>
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<li>Replace one character of <code>password</code> with another character.</li>
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</ul>
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<p> </p>
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<p><strong>Example 1:</strong></p>
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<pre><strong>Input:</strong> password = "a"
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<strong>Output:</strong> 5
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</pre><p><strong>Example 2:</strong></p>
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<pre><strong>Input:</strong> password = "aA1"
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<strong>Output:</strong> 3
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</pre><p><strong>Example 3:</strong></p>
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<pre><strong>Input:</strong> password = "1337C0d3"
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<strong>Output:</strong> 0
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</pre>
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<p> </p>
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<p><strong>Constraints:</strong></p>
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<ul>
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<li><code>1 <= password.length <= 50</code></li>
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<li><code>password</code> consists of letters, digits, dot <code>'.'</code> or exclamation mark <code>'!'</code>.</li>
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</ul>
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