更新国内版力扣题目描述变更

leetcode-cn/problem (English)/加密解密字符串(English) [encrypt-and-decrypt-strings].html

@@ -7,6 +7,8 @@
 	<li>Replace <code>c</code> with <code>values[i]</code> in the string.</li>
 </ol>
 
+<p>Note that in case a character of the string is <strong>not present</strong> in <code>keys</code>, the encryption process cannot be carried out, and an empty string <code>&quot;&quot;</code> is returned.</p>
+
 <p>A string is <strong>decrypted</strong> with the following process:</p>
 
 <ol>