Computational number theory. Write a program that prints out all integers of the form a3 + b3 where a and b are integers between 0 and N in sorted order, without using excessive space. That is, instead of computing an array of the N2 sums and sorting them, build a minimum-oriented priority queue, initially containing (03, 0, 0), (13, 1, 0), (23, 2, 0), . . . , (N3, N, 0). Then, while the priority queue is nonempty, remove the smallest item(i3 + j3, i, j),print it, and then, if j < N, insert the item (i3 + (j+1)3, i, j+1). Use this program to find all distinct integers a, b, c, and d between 0 and 106 such that a3 + b3 = c3 + d3.
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