How to Solve Right Triangles Problem
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Right Triangles
You are given a 2D boolean matrix grid. A collection of 3 elements of grid is a right triangle if one of its elements is in the same row with another element and in the same column with the third elem...
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Understanding the Right Triangles Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
You are given a 2D boolean matrix grid. A collection of 3 elements of grid is a right triangle if one of its elements is in the same row with another element and in the same column with the third element. The 3 elements may not be next to each other. Return an integer that is the number of right triangles that can be made with 3 elements of grid such that all of them have a value of 1.
Right Triangles
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Examples
grid = [[0,1,0],[0,1,1],[0,1,0]]2There are two right triangles with elements of the value 1. Notice that the blue ones do not form a right triangle because the 3 elements are in the same column.
grid = [[1,0,0,0],[0,1,0,1],[1,0,0,0]]0There are no right triangles with elements of the value 1. Notice that the blue ones do not form a right triangle.
grid = [[1,0,1],[1,0,0],[1,0,0]]2There are two right triangles with elements of the value 1.
Constraints
1 <= grid.length <= 10001 <= grid[i].length <= 10000 <= grid[i][j] <= 1How Interview Coder Helps with Leetcode Problems
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