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For what values of n does there exist an n \times n array of entries -1, 0 or 1 such that the 2 \cdot n sums obtained by summing the elements of the rows and the columns are all different?

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#NaslovOznakeRj.KvalitetaTežina
1738IMO Shortlist 1988 problem 310
1736IMO Shortlist 1988 problem 290
1732IMO Shortlist 1988 problem 250
1728IMO Shortlist 1988 problem 210
1727IMO Shortlist 1988 problem 200
1717IMO Shortlist 1988 problem 100