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== Algorithms and generalizations ==
It has long been known that assignment problems are [[NP-hard]]{{citation needed}}. Nonetheless, an exact solution can be found using [[branch and bound]] techniques which utilize [[relaxation (approximation)]]. Many [[heuristic algorithm]]s have been proposed which provide near-optimal solutions in [[polynomial time]].<ref>Ahuja, R. et al. Exact and Heuristic Algorithms for the Weapon-Target Assignment Problem. Operations Research 55(6), pp. 1136–1146, 2007</ref>
==Example==
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