Discussion @ 1194. Handshakes @ Timus Online Judge

Locomotive Very Very Very Simple [4] // Problem 1194. Handshakes 8 Jan 2003 14:45

every body handshakes all else his couple
so
n*(n-1) div 2
-
k (couples doesnt handshake eachother)!
-->

Var
n,k:integer;
begin
readln(n,k);
writeln(((n*(n-1)) div 2) -k);
end.

Aidin_n7

Koala it's not right to post the accepted program. // Problem 1194. Handshakes 23 Aug 2003 16:40

Caesar11 Re: Very Very Very Simple // Problem 1194. Handshakes 4 Nov 2011 09:21

n(n-1)/2-k。。。

BillSu Re: Very Very Very Simple // Problem 1194. Handshakes 27 Apr 2014 10:30

What is The Autor Thinking?
What's the meaning of the spliting group numbers?
It just piss me off.

bstu_student Re: Very Very Very Simple // Problem 1194. Handshakes 6 Aug 2019 04:13

Yep, this is the one way for solution.

I've met problem like that earlier. Statements consist kinda "you need to get very-very much operation with binary code of number", but after some tests we understood, that solution was kinda "ans = n*(-1)".

And it's good to have a short cut in problems for clever men;)

Discussion of Problem 1194. Handshakes