MathDB
Singapore Combinatorics

Source: Singapore MO senior section round 2 P5

July 19, 2019
combinatoricssquare gridsingapore

Problem Statement

Determine all integer n≥2n \ge 2 such that it is possible to construct an n∗nn * n array where each entry is either −1,0,1-1, 0, 1 so that the sums of elements in every row and every column are distinct
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