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44 lines
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44 lines
2.0 KiB
HTML
<p>You are given a <strong>0-indexed</strong> string <code>num</code> representing a non-negative integer.</p>
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<p>In one operation, you can pick any digit of <code>num</code> and delete it. Note that if you delete all the digits of <code>num</code>, <code>num</code> becomes <code>0</code>.</p>
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<p>Return <em>the <strong>minimum number of operations</strong> required to make</em> <code>num</code> <i>special</i>.</p>
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<p>An integer <code>x</code> is considered <strong>special</strong> if it is divisible by <code>25</code>.</p>
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<p> </p>
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<p><strong class="example">Example 1:</strong></p>
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<pre>
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<strong>Input:</strong> num = "2245047"
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<strong>Output:</strong> 2
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<strong>Explanation:</strong> Delete digits num[5] and num[6]. The resulting number is "22450" which is special since it is divisible by 25.
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It can be shown that 2 is the minimum number of operations required to get a special number.</pre>
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<p><strong class="example">Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> num = "2908305"
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<strong>Output:</strong> 3
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<strong>Explanation:</strong> Delete digits num[3], num[4], and num[6]. The resulting number is "2900" which is special since it is divisible by 25.
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It can be shown that 3 is the minimum number of operations required to get a special number.</pre>
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<p><strong class="example">Example 3:</strong></p>
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<pre>
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<strong>Input:</strong> num = "10"
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<strong>Output:</strong> 1
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<strong>Explanation:</strong> Delete digit num[0]. The resulting number is "0" which is special since it is divisible by 25.
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It can be shown that 1 is the minimum number of operations required to get a special number.
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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 <= num.length <= 100</code></li>
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<li><code>num</code> only consists of digits <code>'0'</code> through <code>'9'</code>.</li>
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<li><code>num</code> does not contain any leading zeros.</li>
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</ul>
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