reward-top-k-students

Reward Top K Students

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topStudents

You are given two string arrays <code>positive_feedback</code> and <code>negative_feedback</code>, containing the words denoting positive and negative feedback, respectively. Note that no word is both positive and negative.

Initially every student has <code>0</code> points. Each positive word in a feedback report increases the points of a student by <code>3</code>, whereas each negative word decreases the points by <code>1</code>.

You are given <code>n</code> feedback reports, represented by a 0-indexed string array <code>report</code>&nbsp;and a 0-indexed integer array <code>student_id</code>, where <code>student_id[i]</code> represents the ID of the student who has received the feedback report <code>report[i]</code>. The ID of each student is unique.

Given an integer <code>k</code>, return the top <code>k</code> students after ranking them in non-increasing order by their points. In case more than one student has the same points, the one with the lower ID ranks higher.

&nbsp;
Example 1:

<pre>
Input: positive_feedback = [&quot;smart&quot;,&quot;brilliant&quot;,&quot;studious&quot;], negative_feedback = [&quot;not&quot;], report = [&quot;this student is studious&quot;,&quot;the student is smart&quot;], student_id = [1,2], k = 2
Output: [1,2]
Explanation: 
Both the students have 1 positive feedback and 3 points but since student 1 has a lower ID he ranks higher.
</pre>

Example 2:

<pre>
Input: positive_feedback = [&quot;smart&quot;,&quot;brilliant&quot;,&quot;studious&quot;], negative_feedback = [&quot;not&quot;], report = [&quot;this student is not studious&quot;,&quot;the student is smart&quot;], student_id = [1,2], k = 2
Output: [2,1]
Explanation: 
- The student with ID 1 has 1 positive feedback and 1 negative feedback, so he has 3-1=2 points. 
- The student with ID 2 has 1 positive feedback, so he has 3 points. 
Since student 2 has more points, [2,1] is returned.
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>1 &lt;= positive_feedback.length, negative_feedback.length &lt;= 104</code></li>
	<li><code>1 &lt;= positive_feedback[i].length, negative_feedback[j].length &lt;= 100</code></li>
	<li>Both <code>positive_feedback[i]</code> and <code>negative_feedback[j]</code> consists of lowercase English letters.</li>
	<li>No word is present in both <code>positive_feedback</code> and <code>negative_feedback</code>.</li>
	<li><code>n == report.length == student_id.length</code></li>
	<li><code>1 &lt;= n &lt;= 104</code></li>
	<li><code>report[i]</code> consists of lowercase English letters and spaces <code>&#39; &#39;</code>.</li>
	<li>There is a single space between consecutive words of <code>report[i]</code>.</li>
	<li><code>1 &lt;= report[i].length &lt;= 100</code></li>
	<li><code>1 &lt;= student_id[i] &lt;= 109</code></li>
	<li>All the values of <code>student_id[i]</code> are unique.</li>
	<li><code>1 &lt;= k &lt;= n</code></li>
</ul>

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