Program to find id of candidate who have hot majority vote in Python

Suppose we have a list of numbers called nums containing n values, where each number represents a vote to a candidate. We have to find the id of the candidate that has greater than floor(n/2) number of votes, and if there is no majority vote then return -1.

So, if the input is like nums = [6, 6, 2, 2, 3, 3, 3, 3, 3], then the output will be 3.

To solve this, we will follow these steps −

• l := size of nums
• count := a map containing each individual number and their occurrences
• for each number i and occurrence j in count, do
  • if j > (l / 2), then
    • return i
• return -1

Let us see the following implementation to get better understanding −

Example

class Solution:
   def solve(self, nums):
      l = len(nums)
      from collections import Counter
      count = Counter(nums)
      for i, j in count.items():
         if j > (l // 2):
            return i
      return -1
ob = Solution()
nums = [6, 6, 2, 2, 3, 3, 3, 3, 3]
print(ob.solve(nums))

Input

[6, 6, 2, 2, 3, 3, 3, 3, 3]

Output

3