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45 lines
2.4 KiB
HTML
45 lines
2.4 KiB
HTML
<p>You are given two <strong>0-indexed</strong> strings <code>str1</code> and <code>str2</code>.</p>
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<p>In an operation, you select a <strong>set</strong> of indices in <code>str1</code>, and for each index <code>i</code> in the set, increment <code>str1[i]</code> to the next character <strong>cyclically</strong>. That is <code>'a'</code> becomes <code>'b'</code>, <code>'b'</code> becomes <code>'c'</code>, and so on, and <code>'z'</code> becomes <code>'a'</code>.</p>
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<p>Return <code>true</code> <em>if it is possible to make </em><code>str2</code> <em>a subsequence of </em><code>str1</code> <em>by performing the operation <strong>at most once</strong></em>, <em>and</em> <code>false</code> <em>otherwise</em>.</p>
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<p><strong>Note:</strong> A subsequence of a string is a new string that is formed from the original string by deleting some (possibly none) of the characters without disturbing the relative positions of the remaining characters.</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> str1 = "abc", str2 = "ad"
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<strong>Output:</strong> true
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<strong>Explanation:</strong> Select index 2 in str1.
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Increment str1[2] to become 'd'.
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Hence, str1 becomes "abd" and str2 is now a subsequence. Therefore, true is returned.</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> str1 = "zc", str2 = "ad"
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<strong>Output:</strong> true
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<strong>Explanation:</strong> Select indices 0 and 1 in str1.
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Increment str1[0] to become 'a'.
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Increment str1[1] to become 'd'.
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Hence, str1 becomes "ad" and str2 is now a subsequence. Therefore, true is returned.</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> str1 = "ab", str2 = "d"
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<strong>Output:</strong> false
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<strong>Explanation:</strong> In this example, it can be shown that it is impossible to make str2 a subsequence of str1 using the operation at most once.
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Therefore, false is returned.</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 <= str1.length <= 10<sup>5</sup></code></li>
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<li><code>1 <= str2.length <= 10<sup>5</sup></code></li>
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<li><code>str1</code> and <code>str2</code> consist of only lowercase English letters.</li>
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</ul>
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