apply-discount-to-prices

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Algorithms

A sentence is a string of single-space separated words where each word can contain digits, lowercase letters, and the dollar sign <code>&#39;$&#39;</code>. A word represents a price if it is a sequence of digits preceded by a dollar sign.

<ul>
	<li>For example, <code>&quot;$100&quot;</code>, <code>&quot;$23&quot;</code>, and <code>&quot;$6&quot;</code> represent prices while <code>&quot;100&quot;</code>, <code>&quot;$&quot;</code>, and <code>&quot;$1e5&quot;</code> do not.</li>
</ul>

You are given a string <code>sentence</code> representing a sentence and an integer <code>discount</code>. For each word representing a price, apply a discount of <code>discount%</code> on the price and update the word in the sentence. All updated prices should be represented with exactly two decimal places.

Return a string representing the modified sentence.

Note that all prices will contain at most <code>10</code> digits.

&nbsp;
Example 1:

<pre>
Input: sentence = &quot;there are $1 $2 and 5$ candies in the shop&quot;, discount = 50
Output: &quot;there are $0.50 $1.00 and 5$ candies in the shop&quot;
Explanation: 
The words which represent prices are &quot;$1&quot; and &quot;$2&quot;. 
- A 50% discount on &quot;$1&quot; yields &quot;$0.50&quot;, so &quot;$1&quot; is replaced by &quot;$0.50&quot;.
- A 50% discount on &quot;$2&quot; yields &quot;$1&quot;. Since we need to have exactly 2 decimal places after a price, we replace &quot;$2&quot; with &quot;$1.00&quot;.
</pre>

Example 2:

<pre>
Input: sentence = &quot;1 2 $3 4 $5 $6 7 8$ $9 $10$&quot;, discount = 100
Output: &quot;1 2 $0.00 4 $0.00 $0.00 7 8$ $0.00 $10$&quot;
Explanation: 
Applying a 100% discount on any price will result in 0.
The words representing prices are &quot;$3&quot;, &quot;$5&quot;, &quot;$6&quot;, and &quot;$9&quot;.
Each of them is replaced by &quot;$0.00&quot;.
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>1 &lt;= sentence.length &lt;= 105</code></li>
	<li><code>sentence</code> consists of lowercase English letters, digits, <code>&#39; &#39;</code>, and <code>&#39;$&#39;</code>.</li>
	<li><code>sentence</code> does not have leading or trailing spaces.</li>
	<li>All words in <code>sentence</code> are separated by a single space.</li>
	<li>All prices will be positive numbers without leading zeros.</li>
	<li>All prices will have at most <code>10</code> digits.</li>
	<li><code>0 &lt;= discount &lt;= 100</code></li>
</ul>

discountPrices

Apply Discount to Prices

Multiply Strings

multiply-strings

字符串相乘

Apply Discount Every n Orders

apply-discount-every-n-orders

每隔 n 个顾客打折

String

句子 是由若干个单词组成的字符串，单词之间用单个空格分隔，其中每个单词可以包含数字、小写字母、和美元符号 <code>'$'</code> 。如果单词的形式为美元符号后跟着一个非负实数，那么这个单词就表示一个 价格 。

<ul>
	<li>例如 <code>"$100"</code>、<code>"$23"</code> 和 <code>"$6"</code> 表示价格，而 <code>"100"</code>、<code>"$"</code> 和 <code>"$1e5</code> 不是。</li>
</ul>

给你一个字符串 <code>sentence</code> 表示一个句子和一个整数 <code>discount</code> 。对于每个表示价格的单词，都在价格的基础上减免 <code>discount%</code> ，并 更新 该单词到句子中。所有更新后的价格应该表示为一个 恰好保留小数点后两位 的数字。

返回表示修改后句子的字符串。

注意：所有价格 最多 为&nbsp;<code>10</code> 位数字。

&nbsp;

示例 1：

<pre>
输入：sentence = "there are $1 $2 and 5$ candies in the shop", discount = 50
输出："there are $0.50 $1.00 and 5$ candies in the shop"
解释：
表示价格的单词是 "$1" 和 "$2" 。 
- "$1" 减免 50% 为 "$0.50" ，所以 "$1" 替换为 "$0.50" 。
- "$2" 减免 50% 为 "$1" ，所以 "$2" 替换为 "$1.00" 。</pre>

示例 2：

<pre>
输入：sentence = "1 2 $3 4 $5 $6 7 8$ $9 $10$", discount = 100
输出："1 2 $0.00 4 $0.00 $0.00 7 8$ $0.00 $10$"
解释：
任何价格减免 100% 都会得到 0 。
表示价格的单词分别是 "$3"、"$5"、"$6" 和 "$9"。
每个单词都替换为 "$0.00"。
</pre>

&nbsp;

提示：

<ul>
	<li><code>1 &lt;= sentence.length &lt;= 105</code></li>
	<li><code>sentence</code> 由小写英文字母、数字、<code>' '</code> 和&nbsp;<code>'$'</code> 组成</li>
	<li><code>sentence</code> 不含前导和尾随空格</li>
	<li><code>sentence</code> 的所有单词都用单个空格分隔</li>
	<li>所有价格都是 正 整数且不含前导零</li>
	<li>所有价格 最多 为&nbsp; <code>10</code> 位数字</li>
	<li><code>0 &lt;= discount &lt;= 100</code></li>
</ul>