Martin Davis writes: > Excellent work, Yury. Yes Indeed excellent ! n Pts: 100000 Executed in 2655 ms. n Pts: 200000 Executed in 5277 ms. n Pts: 500000 Executed in 13199 ms. n Pts: 1000000 Executed in 25766 ms. O(N) ! > But we're not done yet.... :-))