Detect Voter Fraud

Given a two dimensional list of integers votes, where each list has two elements [candidate_id, voter_id], report whether any voter has voted more than once.

Constraints

• n ≤ 100,000 where n is the length of votes

https://binarysearch.com/problems/Detect-Voter-Fraud

Examples

Example 1

Input

• votes =

[[3,1],
 [3,0],
 [3,4],
 [3,3],
 [3,2]]

Output

• answer = False

Explanation

Every voter has voted once.

Example 2

Input

• votes =

[[2,3],
 [2,2],
 [2,1],
 [2,0],
 [2,1]]

Output

• answer = True

Explanation

The voter with voter_id 1 voted twice.

Solution