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41 lines
1.7 KiB
HTML
41 lines
1.7 KiB
HTML
<p>You are given a binary string <code>s</code> and a positive integer <code>k</code>.</p>
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<p>Return <em>the length of the <strong>longest</strong> subsequence of </em><code>s</code><em> that makes up a <strong>binary</strong> number less than or equal to</em> <code>k</code>.</p>
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<p>Note:</p>
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<ul>
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<li>The subsequence can contain <strong>leading zeroes</strong>.</li>
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<li>The empty string is considered to be equal to <code>0</code>.</li>
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<li>A <strong>subsequence</strong> is a string that can be derived from another string by deleting some or no characters without changing the order of the remaining characters.</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>
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<strong>Input:</strong> s = "1001010", k = 5
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<strong>Output:</strong> 5
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<strong>Explanation:</strong> The longest subsequence of s that makes up a binary number less than or equal to 5 is "00010", as this number is equal to 2 in decimal.
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Note that "00100" and "00101" are also possible, which are equal to 4 and 5 in decimal, respectively.
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The length of this subsequence is 5, so 5 is returned.
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</pre>
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<p><strong>Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> s = "00101001", k = 1
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<strong>Output:</strong> 6
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<strong>Explanation:</strong> "000001" is the longest subsequence of s that makes up a binary number less than or equal to 1, as this number is equal to 1 in decimal.
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The length of this subsequence is 6, so 6 is returned.
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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 <= s.length <= 1000</code></li>
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<li><code>s[i]</code> is either <code>'0'</code> or <code>'1'</code>.</li>
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<li><code>1 <= k <= 10<sup>9</sup></code></li>
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</ul>
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