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--- sav08:homework04 [2008/03/12 19:00]
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 ===== Problem 2 =====
-Build a [[DPLL Algorithm for SAT|DPLL SAT solver]] that accepts input in the CNF version of the [[DIMACS format]].  (The input file is a formula in conjunctive normal form, where each clause is given on a separate line as a list of indices denoting propositional variables, a negative index indicates a negated propositional variable.)
+Implement the basic [[DPLL Algorithm for SAT]].  Your program should accepts input in the CNF version of the [[DIMACS format]].  (This input file is a formula in conjunctive normal form, where each clause is given on a separate line as a list of indices denoting propositional variables, a negative index indicates a negated propositional variable.)
-If a given formula is satisfiable, the SAT solver should produce an assignment to all variables such that the formula evaluates to //true// under this assignment.
+If a given formula is satisfiable, your SAT solver should produce an assignment to all variables such that the formula evaluates to //true// under this assignment.
+If a given formula is unsatisfiable, for now the SAT solver can simply say "false".
+The expected level of sophistication is the simple DPLL solver with unit propagation described in [[DPLL Algorithm for SAT]], it is not required that you implement advanced techniques or very efficient data structures.
+You will extend your solver in [[homework05]].
-If a given formula is unsatisfiable, the SAT solver can simply say "false".
-The expected level of sophistication is a DPLL solver with unit propagation, additional techniques will be part of the next homework.