Hi Zichen,
MPG does not make a promise here: it says "the solution might not be found again" but it does not give you a guarantee. But for your example I would have to know how nqueen_rbs looks like. Cheers Christian -- Christian Schulte, Professor of Computer Science, KTH, www.gecode.org/~schulte/ From: users-boun...@gecode.org [mailto:users-boun...@gecode.org] On Behalf Of Zhu Zichen's cse Sent: Tuesday, December 16, 2014 3:43 PM To: users@gecode.org Subject: [gecode-users] A problem for restart Dear all, I met a problem when using ​restart in Gecode. I simply use restart to find all solutions for 4-Queens while use the same heuristic after each restart: ./nqueen_rbs -restart geometric -restart-scale 2 -restart-base 10 -nogoods 1 -nogoods-limit 128 4 But I got into an infinite loop which keeps printing the first solution. According to the newest version of document "MPG" (page 160), the master() function posts no-goods when the a solution is found. This means the same solution will not be found again. I rewrite the master() function by changing the last line "return true" into "return false", now all solutions are generated without trapped into a loop. I am wondering why the infinite loop happens and whether Gecode has truly recorded previous solutions as nogoods as the document says. Thanks for help. Zichen Image removed by sender.
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