well..will this work?
x + y = SUM(1:N+2) - SUM(array) = a
x^2 + y^2 = SUM(1^2:(N+2)^2) - SUM(array.^2) = b
so (a^2 - b) = 2xy
so xy = (a^2-b)/2 = k (say)
now,
x + (k/x) = a
x^2 + k = ax
(x, y) = (a +/- sqrt(a^2-4k))/2
I may not have written the equations correctly (need coffee !!!)
but you
Here is the right answer:
Find the sum of missing numbers. Call it S (this is a easy to do).
Now the two missing numbers are such that one is =S/2 and the other is
S/2
Have two variables S1 and S2, traverse the array and add everything = S/2
to S1 and S/2 to S2.
Now
First number = (Sum of
