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How to Solve Minimum Domino Rotations For Equal Row Problem
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Medium#1007
LeetCode ProblemMinimum Domino Rotations For Equal Row
In a row of dominoes, tops[i] and bottoms[i] represent the top and bottom halves of the ith domino. (A domino is a tile with two numbers from 1 to 6 - one on each half of the tile.) We may rotate the ith domino, so that tops[i] and bottoms[i] swap values. Return the minimum number of rotations so that all the values in tops are the same, or all the values in bottoms are the same. If it cannot be done, return -1.
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Problem Breakdown
Understanding the Minimum Domino Rotations For Equal Row Problem
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Problem Statement
In a row of dominoes, tops[i] and bottoms[i] represent the top and bottom halves of the ith domino. (A domino is a tile with two numbers from 1 to 6 - one on each half of the tile.) We may rotate the ith domino, so that tops[i] and bottoms[i] swap values. Return the minimum number of rotations so that all the values in tops are the same, or all the values in bottoms are the same. If it cannot be done, return -1.
Examples
# Example 1
Input
tops = [2,1,2,4,2,2], bottoms = [5,2,6,2,3,2]
Output
2
# Example 2
Input
tops = [3,5,1,2,3], bottoms = [3,6,3,3,4]
Output
-1
Constraints
2 <= tops.length <= 2 * 104
bottoms.length == tops.length
1 <= tops[i], bottoms[i] <= 6
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Solve Minimum Domino Rotations For Equal Row — In a row of dominoes, tops[i] and bottoms[i] represent the top and bottom halves...
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def solve(input):
# Optimal O(n) solution
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Time: O(n) | Space: O(n)
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