Problem 5. Triangle Numbers
Triangle numbers are the sums of successive integers. So 6 is a triangle number because
6 = 1 + 2 + 3
which can be displayed in a triangular shape like so
*
* *
* * *
Thus 6 = triangle(3). Given n, return t, the triangular number for n.
Example:
Input n = 4
Output t is 10
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Partha Saradhi
on 11 Jul 2022
The formula makes this an easy math problem.
Shawn
on 12 Jul 2022
Good Question
Ian
on 11 Dec 2022
+10 points
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Indexing II
- 22 Problems
- 160 Finishers
- Getting the indices from a vector
- Symmetry of vector
- Calculate the Number of Sign Changes in a Row Vector (No Element Is Zero)
- Count consecutive 0's in between values of 1
- Find last zero for each column
- Oh Zero Zero Zero!!!
- Create an index-powered vector
- Find nth maximum
- Decimation - Optimized for speed
- Unique values without using UNIQUE function
- Symmetry of vector
- Generate a vector like 1,2,2,3,3,3,4,4,4,4
- Create an n-by-n null matrix and fill with ones certain positions
- Implement a bubble sort technique and output the number of swaps required
- Create a vector whose elements depend on the previous element
- Set a diagonal
- Unique values without using UNIQUE function
- Generate a vector like 1,2,2,3,3,3,4,4,4,4
- Change the sign of even index entries of the reversed vector
- Decimation
- Insert zeros into vector
- Reference Index Number
- Determine the number of odd integers in a vector
- Max index of 3D array
- Finding peaks
- Getting the indices from a vector
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