flip-columns-for-maximum-number-of-equal-rows

Flip columns for maximum number of equal rows

Problem link

Solutions

Solution.py

# https://leetcode.com/problems/flip-columns-for-maximum-number-of-equal-rows/

class Solution:
    def maxEqualRowsAfterFlips(self, matrix: List[List[int]]) -> int:
        return max(Counter(
            tuple(i ^ row[0] for i in row) for row in matrix
        ).values())

Tags

• Hashmap > Counter
• Bitwise operation > Self-inverse property of xor