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r={single_source_shortest_paths:function(t,e,n){var o={},a={};a[e]=0;var i,u,s,f,h,c,g,d=r.PriorityQueue.make();for(d.push(e,0);!d.empty();)for(s in u=(i=d.pop()).value,f=i.cost,h=t[u]||{})h.hasOwnProperty(s)&&(c=f+h[s],g=a[s],(void 0===a[s]||g>c)&&(a[s]=c,d.push(s,c),o[s]=u));if(void 0!==n&&void 0===a[n]){var l=["Could not find a path from ",e," to ",n,"."].join("");throw new Error(l)}return o},extract_shortest_path_from_predecessor_list:function(t,r){for(var e=[],n=r;n;)e.push(n),n=t[n];return e.reverse(),e},find_path:function(t,e,n){var o=r.single_source_shortest_paths(t,e,n);return r.extract_shortest_path_from_predecessor_list(o,n)},PriorityQueue:{make:function(t){var e,n=r.PriorityQueue,o={};for(e in t=t||{},n)n.hasOwnProperty(e)&&(o[e]=n[e]);return o.queue=[],o.sorter=t.sorter||n.default_sorter,o},default_sorter:function(t,r){return t.cost-r.cost},push:function(t,r){var e={value:t,cost:r};this.queue.push(e),this.queue.sort(this.sorter)},pop:function(){return 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