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back to boardVery Very Very Simple 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 it's not right to post the accepted program. Posted by Koala 23 Aug 2003 16:40 Re: Very Very Very Simple n(n-1)/2-k。。。 Re: Very Very Very Simple Posted by BillSu 27 Apr 2014 10:30 What is The Autor Thinking?
What's the meaning of the spliting group numbers?
It just piss me off. Re: Very Very Very Simple 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;) |
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