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Contests > CEN112 Questions 2016 > problem:


15-PE2-2. 51086 - Top popular student

CEN112 Questions 2016

Start: Mar.30.2016 at 03:10:22 PM
Finish: Apr.01.2016 at 05:00:00 AM
The contest is finished!
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Contest problems

• 15-PE-2. 50866 - Buy the cheapest
• 15-PE-4. 50868 - Sort Frequencies
• 15-PE-5. 50869 - Birthday Celebration
• 15-PE-7. 50871 - Harmonic Mean
• 15-PE-8. 50872 - Top M Grades
• 15-PE2-1. 50980 - The smallest rect...
• 15-PE2-2. 50981 - Top popular m-st...
• 15-PE2-2. 50984 - Top m hardworki...
• 15-PE2-2. 51086 - Top popular s...
• 15-PE2-3. 50982 - A thief in labyrinth
• 15-PE2-4. 50983 - Course Selection
• 15-PE2-6. 50985 - Books Waiting
• 15-PE2-8. 50987 - Very Looong Queue
• 15-RE-2. 50999 - Overlapping Trips
• 3. 51002 - The most successful classes
• 4. 51003 - Double Prime
• HW092. 51081 - Fish Pond I

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Time limit 2199/4000/4000/4000 ms. Memory limit 65000/65000/65000/65000 Kb.
Question by Ibrahim Mesecan.

Top popular student

Question: For a contest, you are searching for the top-m popular students of the university. You are given friends list of n students where some students may appear several times. Count the unique number of friends for each student and identify the top popular student who has the most number of friends.

Input specification You will be given an integer in the beginning: the number of students (n). In each of the following n lines, you will be given several positive integers (friends of the current student) ending with a negative number where 0 ≤ n ≤ 8,000.

Output specification: Show the ID (order of appearance) of top student who has the most number of friends. If there are several students with the same number friends, first show the student with a smaller ID.

Sample Input
7
5 5 7 7 1 -1
6 4 2 5 6 -1
6 6 7 4 5 4 -1
2 7 1 1 7 7 6 5 -1
3 6 4 7 -1
7 6 6 1 7 -1
3 4 5 2 5 1 1 -1
Sample Output
4

Explanation: Here is the list of students with their number of friends.
  1 -> 3
  2 -> 4
  3 -> 4
  4 -> 5
  5 -> 4
  6 -> 3
  7 -> 5



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