What is valid triangle number?
Suppose we have an array consists of non-negative integers, our task is to count the number of triplets chosen from the array that can make triangles if we take them as side lengths of a triangle. So if the input is like [2,2,3,4], then the result will be 3 as [2,3,4] using first 2, [2,3,4] using second 2, and [2,2,3].
How do you tell if there are 3 numbers in an array that can make a valid triangle?
Given an unsorted array of positive integers, find the number of triangles that can be formed with three different array elements as three sides of triangles. For a triangle to be possible from 3 values, the sum of any of the two values (or sides) must be greater than the third value (or third side).
How many possible triangles are there?
Since there is exactly one triangle, there is one solution. Case 3 is referred to as the Ambiguous Case because there are two possible triangles and two possible solutions….SSA Triangles.
| If: | Then: | |
|---|---|---|
| c. | \begin{align*}a > b\end{align*} | One solution |
How do you find a non degenerate triangle?
For a non-degenerate triangle, its sides should follow these constraints, A + B > C and B + C > A and C + A > B where A, B and C are length of sides of the triangle. The task is to find any triplet from array that satisfies above condition.
Is a degenerate triangle a triangle?
A degenerate triangle is the “triangle” formed by three collinear points. It doesn’t look like a triangle, it looks like a line segment. A parabola may be thought of as a degenerate ellipse with one vertex at an infinitely distant point.
What is valid triangle?
Approach: A triangle is valid if sum of its two sides is greater than the third side. If three sides are a, b and c, then three conditions should be met.
Which is the valid number for a triangle?
611. Valid Triangle Number Given an integer array nums, return the number of triplets chosen from the array that can make triangles if we take them as side lengths of a triangle. a + c > b a +c>b.
Which is the correct format for a phone number?
You may assume that a valid phone number must appear in one of the following two formats: (xxx) xxx-xxxx or xxx-xxx-xxxx. (x means a digit) You may also assume each line in the text file must not contain leading or trailing white spaces.
How can I print a valid phone number?
Given a text file file.txt that contains a list of phone numbers (one per line), write a one-liner bash script to print all valid phone numbers. You may assume that a valid phone number must appear in one of the following two formats: (xxx) xxx-xxxx or xxx-xxx-xxxx. (x means a digit)