check-if-digits-are-equal-in-string-after-operations-i

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Algorithms

You are given a string <code>s</code> consisting of digits. Perform the following operation repeatedly until the string has exactly two digits:

<ul>
	<li>For each pair of consecutive digits in <code>s</code>, starting from the first digit, calculate a new digit as the sum of the two digits modulo 10.</li>
	<li>Replace <code>s</code> with the sequence of newly calculated digits, maintaining the order in which they are computed.</li>
</ul>

Return <code>true</code> if the final two digits in <code>s</code> are the same; otherwise, return <code>false</code>.

&nbsp;
Example 1:

<div class="example-block">
Input: s = &quot;3902&quot;

Output: true

Explanation:

<ul>
	<li>Initially, <code>s = &quot;3902&quot;</code></li>
	<li>First operation:
	<ul>
		<li><code>(s[0] + s[1]) % 10 = (3 + 9) % 10 = 2</code></li>
		<li><code>(s[1] + s[2]) % 10 = (9 + 0) % 10 = 9</code></li>
		<li><code>(s[2] + s[3]) % 10 = (0 + 2) % 10 = 2</code></li>
		<li><code>s</code> becomes <code>&quot;292&quot;</code></li>
	</ul>
	</li>
	<li>Second operation:
	<ul>
		<li><code>(s[0] + s[1]) % 10 = (2 + 9) % 10 = 1</code></li>
		<li><code>(s[1] + s[2]) % 10 = (9 + 2) % 10 = 1</code></li>
		<li><code>s</code> becomes <code>&quot;11&quot;</code></li>
	</ul>
	</li>
	<li>Since the digits in <code>&quot;11&quot;</code> are the same, the output is <code>true</code>.</li>
</ul>
</div>

Example 2:

<div class="example-block">
Input: s = &quot;34789&quot;

Output: false

Explanation:

<ul>
	<li>Initially, <code>s = &quot;34789&quot;</code>.</li>
	<li>After the first operation, <code>s = &quot;7157&quot;</code>.</li>
	<li>After the second operation, <code>s = &quot;862&quot;</code>.</li>
	<li>After the third operation, <code>s = &quot;48&quot;</code>.</li>
	<li>Since <code>&#39;4&#39; != &#39;8&#39;</code>, the output is <code>false</code>.</li>
</ul>
</div>

&nbsp;
Constraints:

<ul>
	<li><code>3 &lt;= s.length &lt;= 100</code></li>
	<li><code>s</code> consists of only digits.</li>
</ul>

hasSameDigits

Check If Digits Are Equal in String After Operations I

Math

String

Combinatorics

Number Theory

Simulation

给你一个由数字组成的字符串 <code>s</code>&nbsp;。重复执行以下操作，直到字符串恰好包含&nbsp;两个&nbsp;数字：

<ul>
	<li>从第一个数字开始，对于 <code>s</code> 中的每一对连续数字，计算这两个数字的和&nbsp;模&nbsp;10。</li>
	<li>用计算得到的新数字依次替换 <code>s</code>&nbsp;的每一个字符，并保持原本的顺序。</li>
</ul>

如果 <code>s</code>&nbsp;最后剩下的两个数字 相同 ，返回 <code>true</code>&nbsp;。否则，返回 <code>false</code>。

&nbsp;

示例 1：

<div class="example-block">
输入： s = "3902"

输出： true

解释：

<ul>
	<li>一开始，<code>s = "3902"</code></li>
	<li>第一次操作：
	<ul>
		<li><code>(s[0] + s[1]) % 10 = (3 + 9) % 10 = 2</code></li>
		<li><code>(s[1] + s[2]) % 10 = (9 + 0) % 10 = 9</code></li>
		<li><code>(s[2] + s[3]) % 10 = (0 + 2) % 10 = 2</code></li>
		<li><code>s</code> 变为 <code>"292"</code></li>
	</ul>
	</li>
	<li>第二次操作：
	<ul>
		<li><code>(s[0] + s[1]) % 10 = (2 + 9) % 10 = 1</code></li>
		<li><code>(s[1] + s[2]) % 10 = (9 + 2) % 10 = 1</code></li>
		<li><code>s</code> 变为 <code>"11"</code></li>
	</ul>
	</li>
	<li>由于 <code>"11"</code> 中的数字相同，输出为 <code>true</code>。</li>
</ul>
</div>

示例 2：

<div class="example-block">
输入： s = "34789"

输出： false

解释：

<ul>
	<li>一开始，<code>s = "34789"</code>。</li>
	<li>第一次操作后，<code>s = "7157"</code>。</li>
	<li>第二次操作后，<code>s = "862"</code>。</li>
	<li>第三次操作后，<code>s = "48"</code>。</li>
	<li>由于 <code>'4' != '8'</code>，输出为 <code>false</code>。</li>
</ul>

&nbsp;
</div>

提示：

<ul>
	<li><code>3 &lt;= s.length &lt;= 100</code></li>
	<li><code>s</code> 仅由数字组成。</li>
</ul>