How to Solve Find Missing and Repeated Values Problem
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Find Missing and Repeated Values
You are given a 0-indexed 2D integer matrix grid of size n * n with values in the range [1, n2]. Each integer appears exactly once except a which appears twice and b which is missing. The task is to f...
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Understanding the Find Missing and Repeated Values Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
You are given a 0-indexed 2D integer matrix grid of size n * n with values in the range [1, n2]. Each integer appears exactly once except a which appears twice and b which is missing. The task is to find the repeating and missing numbers a and b. Return a 0-indexed integer array ans of size 2 where ans[0] equals to a and ans[1] equals to b.
Find Missing and Repeated Values
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Examples
grid = [[1,3],[2,2]][2,4]Number 2 is repeated and number 4 is missing so the answer is [2,4].
grid = [[9,1,7],[8,9,2],[3,4,6]][9,5]Number 9 is repeated and number 5 is missing so the answer is [9,5].
Constraints
2 <= n == grid.length == grid[i].length <= 501 <= grid[i][j] <= n * nFor all x that 1 <= x <= n * n there is exactly one x that is not equal to any of the grid members.For all x that 1 <= x <= n * n there is exactly one x that is equal to exactly two of the grid members.For all x that 1 <= x <= n * n except two of them there is exactly one pair of i, j that 0 <= i, j <= n - 1 and grid[i][j] == x.How Interview Coder Helps with Leetcode Problems
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