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MIN-CONFLICTS

AIMA3e

function MIN-CONFLICTS(csp, max_steps) returns a solution of failure
inputs: csp, a constraint satisfaction problem
    max_steps, the number of steps allowed before giving up

current ← an initial complete assignment for csp
for i = 1 to max_steps do
   if current is a solution for csp then return current
   var ← a randomly chosen conflicted variable from csp.VARIABLES
   value ← the value v for var that minimizes CONFLICTS(var, v, current, csp)
   set var = value in current
return failure


Figure ?? The MIN-CONFLICTS algorithm for solving CSPs by local search. The initial state may be chosen randomly or by a greedy assignment process that chooses a minimal-conflict value for each variable in turn. The CONFLICTS function counts the number of constraints violated by a particular value, given the rest of the current assignment.