Need help for certain problem

Revision en1, by seecret, 2021-02-03 19:31:54

there is N X N matrix and each of cell has a number on it from 0 to 9. i want to choose N numbers among them. two conditions should be satisfied. — you can choose at most 1 number from each row. — you can choose at most 1 number from each column. (here , N<=50.)

can i get some advices for this problem?

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en2 English seecret 2021-02-03 19:32:50 6 Tiny change: 'tisfied.\n &mdash;' -> 'tisfied.\n\n &mdash;'
en1 English seecret 2021-02-03 19:31:54 358 Initial revision (published)