computational-problem-solving / sat

:satisfied: Boolean formula satisfiability algorithms for JavaScript

😆 @problem-solving/sat

© xkcd.com

Boolean formula satisfiability algorithms for JavaScript. See docs. Parent is js-algorithms. For a polynomial time algorithm for the 2SAT problem see @problem-solving/2sat.

let instance = sat.from.signs( [ [ -1 , 2 , 3 ] , [ -2 , -4 , 5 ] , [ 1 , -5 ] ] ) ;
// or
// let instance = sat.from.keys(
// [
//   [ [ false , '1' ] , [ true , '2' ] , [ true , '3' ] ] ,
//   [ [ false , '2' ] , [ false , '4' ] , [ true , '5' ] ] ,
//   [ [ true , '1' ] , [ false , '5' ] ]
// ]
// ) ;
sat.decide( instance ) ; // true
sat.verify( instance , sat.solve( instance ).next( ).value ) ; // true
for ( let certificate of sat.solve( instance ) ) {
    console.log( instance.assignment( certificate ) ) ;
}

📜 Reference

• Simple solver in Python
• SATLIB

sat's Issues

Test case with 2 contradictory clauses runs forever

Here's the test case:

require("babel-polyfill");
const sat = require("@aureooms/js-sat");

const instance = sat.from.parities([[80], [81]]);
console.log(JSON.stringify(instance));
console.log(sat.decide(instance));

On my x64 Windows box, when I save this as sat.js and run "node sat.js", I get the following:

node sat.js
{"clauses":[[80],[81]],"n":41}

It just spins forever using up one my CPUs. If I change the clauses to [[0], [1]], it runs quickly and correctly decides that these clauses are not satisfiable. Starting around [[50], [51]], things get really slow.

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• ⬆️ deps: Upgrade dependency xo to v0.45.0

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Skip unused variables.

See discussion in #36. One way to solve this problem is to introduce a variable mapping for sat.from.parities and sat.from.signs.

Action Required: Fix Renovate Configuration

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Error type: undefined. Note: this is a nested preset so please contact the preset author if you are unable to fix it yourself.