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45 lines
2.1 KiB
HTML
45 lines
2.1 KiB
HTML
<p>You are playing the <strong><a href="https://en.wikipedia.org/wiki/Bulls_and_Cows" target="_blank">Bulls and Cows</a></strong> game with your friend.</p>
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<p>You write down a secret number and ask your friend to guess what the number is. When your friend makes a guess, you provide a hint with the following info:</p>
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<ul>
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<li>The number of "bulls", which are digits in the guess that are in the correct position.</li>
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<li>The number of "cows", which are digits in the guess that are in your secret number but are located in the wrong position. Specifically, the non-bull digits in the guess that could be rearranged such that they become bulls.</li>
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</ul>
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<p>Given the secret number <code>secret</code> and your friend's guess <code>guess</code>, return <em>the hint for your friend's guess</em>.</p>
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<p>The hint should be formatted as <code>"xAyB"</code>, where <code>x</code> is the number of bulls and <code>y</code> is the number of cows. Note that both <code>secret</code> and <code>guess</code> may contain duplicate digits.</p>
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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> secret = "1807", guess = "7810"
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<strong>Output:</strong> "1A3B"
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<strong>Explanation:</strong> Bulls are connected with a '|' and cows are underlined:
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"1807"
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"<u>7</u>8<u>10</u>"</pre>
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<p><strong>Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> secret = "1123", guess = "0111"
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<strong>Output:</strong> "1A1B"
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<strong>Explanation:</strong> Bulls are connected with a '|' and cows are underlined:
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"1123" "1123"
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| or |
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"01<u>1</u>1" "011<u>1</u>"
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Note that only one of the two unmatched 1s is counted as a cow since the non-bull digits can only be rearranged to allow one 1 to be a bull.
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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 <= secret.length, guess.length <= 1000</code></li>
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<li><code>secret.length == guess.length</code></li>
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<li><code>secret</code> and <code>guess</code> consist of digits only.</li>
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</ul>
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