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fix(heap): handle case with one element properly

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Simon Cruanes 2019-11-29 14:02:36 -06:00
parent 87a2936f75
commit ca9d5447e0
1 changed files with 2 additions and 1 deletions
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3
src/core/Heap.ml
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@ -126,10 +126,11 @@ module Make(Elt : RANKED) = struct
let remove_min ({heap} as s) =
if Vec.size heap=0 then raise Not_found;
let x = Vec.get heap 0 in
Elt.set_idx x _absent_index;
let new_hd = Vec.pop heap in (* new head *)
Vec.set heap 0 new_hd;
Elt.set_idx new_hd 0;
(* remove [x]. do it after [new_hd.idx<-0] in case [x==new_hd] *)
Elt.set_idx x _absent_index;
(* enforce heap property again *)
if Vec.size heap > 1 then (
percolate_down s new_hd;