Update utils4e.py#1217
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pctablet505 wants to merge 3 commits intoaimacode:masterfrom
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Better implementation of PriorityQueue to reduce time complexity of __contains__, __getitem__ from O(n) to (1) and for __delitem__ from O(n) to O(log n) amortized
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Better implementation of PriorityQueue to reduce time complexity of
contains, getitem from O(n) to (1)
and for delitem from O(n) to O(log n) amortized