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We have integers <math>c_{ij}</math> (''i=1,...,n, j=1,...,n''). Decide if there are permutations <math>\pi_i</math> (''i=1,...,n'') and <math>\sigma_j</math> (''j=1,...,n'') such that <math>\pi_i(j)+\sigma_j(i) \leq c_{ij}</math> for every ''i,j''. [[Papjuli]]

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