The Dinner
Statement
Goal
When you go out to dinner with your friends, everyone toasts with everyone else once. You wonder how often one glass bumps into another.Input
An integer n indicating the number of guests
Output
An integer that indicates the number of times the glasses have been knocked together
Constraints
0 ≤ n ≤ 1000
Example
Input
2
Output
1
Game modes
Fastest, Shortest
Test cases
2 Friends Test
Input
2
Output
1
3 Friends Validator
Input
3
Output
3
5 Friends Test
Input
5
Output
10
20 Friends Validator
Input
20
Output
190
10 Friends Test
Input
10
Output
45
17 Friends Validator
Input
17
Output
136
A very big group - 100 Friends!!! Test
Input
100
Output
4950
11 Friends Validator
Input
11
Output
55
Solution language
Solution
Stub generator input