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Re:Idea .. .. ..

Posted by cypressx at 2004-12-08 01:33:05 on Problem 2140
In Reply To:Idea .. .. .. Posted by:cypressx at 2004-12-06 00:58:22 
I tried with solving the equation :
p(p-1) - q(q-1) = N     // this comes from :
                        // if we want the sum from i to j we can 
                        // subtract the sum 1..j - 1..i 
                        // and for the sum 1..n we have a formula :
                        // n*(n-1)/2
it has complexity O(N) but it is too slow.
Anyone to give a hint ?
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