How to Solve Random Flip Matrix Problem
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Random Flip Matrix
There is an m x n binary grid matrix with all the values set 0 initially. Design an algorithm to randomly pick an index (i, j) where matrix[i][j] == 0 and flips it to 1. All the indices (i, j) where m...
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Understanding the Random Flip Matrix Problem
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Problem Statement
There is an m x n binary grid matrix with all the values set 0 initially. Design an algorithm to randomly pick an index (i, j) where matrix[i][j] == 0 and flips it to 1. All the indices (i, j) where matrix[i][j] == 0 should be equally likely to be returned. Optimize your algorithm to minimize the number of calls made to the built-in random function of your language and optimize the time and space complexity. Implement the Solution class: Solution(int m, int n) Initializes the object with the size of the binary matrix m and n. int[] flip() Returns a random index [i, j] of the matrix where matrix[i][j] == 0 and flips it to 1. void reset() Resets all the values of the matrix to be 0.
Random Flip Matrix
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Examples
Example inputExample outputConstraints
1 <= m, n <= 104There will be at least one free cell for each call to flip.At most 1000 calls will be made to flip and reset.How Interview Coder Helps with Leetcode Problems
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