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π //snap/core22/current/lib/python3.10/heapq.py
"""Heap queue algorithm (a.k.a. priority queue). Heaps are arrays for which a[k] <= a[2*k+1] and a[k] <= a[2*k+2] for all k, counting elements from 0. For the sake of comparison, non-existing elements are considered to be infinite. The interesting property of a heap is that a[0] is always its smallest element. Usage: heap = [] # creates an empty heap heappush(heap, item) # pushes a new item on the heap item = heappop(heap) # pops the smallest item from the heap item = heap[0] # smallest item on the heap without popping it heapify(x) # transforms list into a heap, in-place, in linear time item = heapreplace(heap, item) # pops and returns smallest item, and adds # new item; the heap size is unchanged Our API differs from textbook heap algorithms as follows: - We use 0-based indexing. This makes the relationship between the index for a node and the indexes for its children slightly less obvious, but is more suitable since Python uses 0-based indexing. - Our heappop() method returns the smallest item, not the largest. These two make it possible to view the heap as a regular Python list without surprises: heap[0] is the smallest item, and heap.sort() maintains the heap invariant! """ # Original code by Kevin O'Connor, augmented by Tim Peters and Raymond Hettinger __about__ = """Heap queues [explanation by FranΓ§ois Pinard] Heaps are arrays for which a[k] <= a[2*k+1] and a[k] <= a[2*k+2] for all k, counting elements from 0. For the sake of comparison, non-existing elements are considered to be infinite. The interesting property of a heap is that a[0] is always its smallest element. The strange invariant above is meant to be an efficient memory representation for a tournament. The numbers below are `k', not a[k]: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 In the tree above, each cell `k' is topping `2*k+1' and `2*k+2'. In a usual binary tournament we see in sports, each cell is the winner over the two cells it tops, and we can trace the winner down the tree to see all opponents s/he had. However, in many computer applications of such tournaments, we do not need to trace the history of a winner. To be more memory efficient, when a winner is promoted, we try to replace it by something else at a lower level, and the rule becomes that a cell and the two cells it tops contain three different items, but the top cell "wins" over the two topped cells. If this heap invariant is protected at all time, index 0 is clearly the overall winner. The simplest algorithmic way to remove it and find the "next" winner is to move some loser (let's say cell 30 in the diagram above) into the 0 position, and then percolate this new 0 down the tree, exchanging values, until the invariant is re-established. This is clearly logarithmic on the total number of items in the tree. By iterating over all items, you get an O(n ln n) sort. A nice feature of this sort is that you can efficiently insert new items while the sort is going on, provided that the inserted items are not "better" than the last 0'th element you extracted. This is especially useful in simulation contexts, where the tree holds all incoming events, and the "win" condition means the smallest scheduled time. When an event schedule other events for execution, they are scheduled into the future, so they can easily go into the heap. So, a heap is a good structure for implementing schedulers (this is what I used for my MIDI sequencer :-). Various structures for implementing schedulers have been extensively studied, and heaps are good for this, as they are reasonably speedy, the speed is almost constant, and the worst case is not much different than the average case. However, there are other representations which are more efficient overall, yet the worst cases might be terrible. Heaps are also very useful in big disk sorts. You most probably all know that a big sort implies producing "runs" (which are pre-sorted sequences, which size is usually related to the amount of CPU memory), followed by a merging passes for these runs, which merging is often very cleverly organised[1]. It is very important that the initial sort produces the longest runs possible. Tournaments are a good way to that. If, using all the memory available to hold a tournament, you replace and percolate items that happen to fit the current run, you'll produce runs which are twice the size of the memory for random input, and much better for input fuzzily ordered. Moreover, if you output the 0'th item on disk and get an input which may not fit in the current tournament (because the value "wins" over the last output value), it cannot fit in the heap, so the size of the heap decreases. The freed memory could be cleverly reused immediately for progressively building a second heap, which grows at exactly the same rate the first heap is melting. When the first heap completely vanishes, you switch heaps and start a new run. Clever and quite effective! In a word, heaps are useful memory structures to know. I use them in a few applications, and I think it is good to keep a `heap' module around. :-) -------------------- [1] The disk balancing algorithms which are current, nowadays, are more annoying than clever, and this is a consequence of the seeking capabilities of the disks. On devices which cannot seek, like big tape drives, the story was quite different, and one had to be very clever to ensure (far in advance) that each tape movement will be the most effective possible (that is, will best participate at "progressing" the merge). Some tapes were even able to read backwards, and this was also used to avoid the rewinding time. Believe me, real good tape sorts were quite spectacular to watch! From all times, sorting has always been a Great Art! :-) """ __all__ = ['heappush', 'heappop', 'heapify', 'heapreplace', 'merge', 'nlargest', 'nsmallest', 'heappushpop'] def heappush(heap, item): """Push item onto heap, maintaining the heap invariant.""" heap.append(item) _siftdown(heap, 0, len(heap)-1) def heappop(heap): """Pop the smallest item off the heap, maintaining the heap invariant.""" lastelt = heap.pop() # raises appropriate IndexError if heap is empty if heap: returnitem = heap[0] heap[0] = lastelt _siftup(heap, 0) return returnitem return lastelt def heapreplace(heap, item): """Pop and return the current smallest value, and add the new item. This is more efficient than heappop() followed by heappush(), and can be more appropriate when using a fixed-size heap. Note that the value returned may be larger than item! That constrains reasonable uses of this routine unless written as part of a conditional replacement: if item > heap[0]: item = heapreplace(heap, item) """ returnitem = heap[0] # raises appropriate IndexError if heap is empty heap[0] = item _siftup(heap, 0) return returnitem def heappushpop(heap, item): """Fast version of a heappush followed by a heappop.""" if heap and heap[0] < item: item, heap[0] = heap[0], item _siftup(heap, 0) return item def heapify(x): """Transform list into a heap, in-place, in O(len(x)) time.""" n = len(x) # Transform bottom-up. The largest index there's any point to looking at # is the largest with a child index in-range, so must have 2*i + 1 < n, # or i < (n-1)/2. If n is even = 2*j, this is (2*j-1)/2 = j-1/2 so # j-1 is the largest, which is n//2 - 1. If n is odd = 2*j+1, this is # (2*j+1-1)/2 = j so j-1 is the largest, and that's again n//2-1. for i in reversed(range(n//2)): _siftup(x, i) def _heappop_max(heap): """Maxheap version of a heappop.""" lastelt = heap.pop() # raises appropriate IndexError if heap is empty if heap: returnitem = heap[0] heap[0] = lastelt _siftup_max(heap, 0) return returnitem return lastelt def _heapreplace_max(heap, item): """Maxheap version of a heappop followed by a heappush.""" returnitem = heap[0] # raises appropriate IndexError if heap is empty heap[0] = item _siftup_max(heap, 0) return returnitem def _heapify_max(x): """Transform list into a maxheap, in-place, in O(len(x)) time.""" n = len(x) for i in reversed(range(n//2)): _siftup_max(x, i) # 'heap' is a heap at all indices >= startpos, except possibly for pos. pos # is the index of a leaf with a possibly out-of-order value. Restore the # heap invariant. def _siftdown(heap, startpos, pos): newitem = heap[pos] # Follow the path to the root, moving parents down until finding a place # newitem fits. while pos > startpos: parentpos = (pos - 1) >> 1 parent = heap[parentpos] if newitem < parent: heap[pos] = parent pos = parentpos continue break heap[pos] = newitem # The child indices of heap index pos are already heaps, and we want to make # a heap at index pos too. We do this by bubbling the smaller child of # pos up (and so on with that child's children, etc) until hitting a leaf, # then using _siftdown to move the oddball originally at index pos into place. # # We *could* break out of the loop as soon as we find a pos where newitem <= # both its children, but turns out that's not a good idea, and despite that # many books write the algorithm that way. During a heap pop, the last array # element is sifted in, and that tends to be large, so that comparing it # against values starting from the root usually doesn't pay (= usually doesn't # get us out of the loop early). See Knuth, Volume 3, where this is # explained and quantified in an exercise. # # Cutting the # of comparisons is important, since these routines have no # way to extract "the priority" from an array element, so that intelligence # is likely to be hiding in custom comparison methods, or in array elements # storing (priority, record) tuples. Comparisons are thus potentially # expensive. # # On random arrays of length 1000, making this change cut the number of # comparisons made by heapify() a little, and those made by exhaustive # heappop() a lot, in accord with theory. Here are typical results from 3 # runs (3 just to demonstrate how small the variance is): # # Compares needed by heapify Compares needed by 1000 heappops # -------------------------- -------------------------------- # 1837 cut to 1663 14996 cut to 8680 # 1855 cut to 1659 14966 cut to 8678 # 1847 cut to 1660 15024 cut to 8703 # # Building the heap by using heappush() 1000 times instead required # 2198, 2148, and 2219 compares: heapify() is more efficient, when # you can use it. # # The total compares needed by list.sort() on the same lists were 8627, # 8627, and 8632 (this should be compared to the sum of heapify() and # heappop() compares): list.sort() is (unsurprisingly!) more efficient # for sorting. def _siftup(heap, pos): endpos = len(heap) startpos = pos newitem = heap[pos] # Bubble up the smaller child until hitting a leaf. childpos = 2*pos + 1 # leftmost child position while childpos < endpos: # Set childpos to index of smaller child. rightpos = childpos + 1 if rightpos < endpos and not heap[childpos] < heap[rightpos]: childpos = rightpos # Move the smaller child up. heap[pos] = heap[childpos] pos = childpos childpos = 2*pos + 1 # The leaf at pos is empty now. Put newitem there, and bubble it up # to its final resting place (by sifting its parents down). heap[pos] = newitem _siftdown(heap, startpos, pos) def _siftdown_max(heap, startpos, pos): 'Maxheap variant of _siftdown' newitem = heap[pos] # Follow the path to the root, moving parents down until finding a place # newitem fits. while pos > startpos: parentpos = (pos - 1) >> 1 parent = heap[parentpos] if parent < newitem: heap[pos] = parent pos = parentpos continue break heap[pos] = newitem def _siftup_max(heap, pos): 'Maxheap variant of _siftup' endpos = len(heap) startpos = pos newitem = heap[pos] # Bubble up the larger child until hitting a leaf. childpos = 2*pos + 1 # leftmost child position while childpos < endpos: # Set childpos to index of larger child. rightpos = childpos + 1 if rightpos < endpos and not heap[rightpos] < heap[childpos]: childpos = rightpos # Move the larger child up. heap[pos] = heap[childpos] pos = childpos childpos = 2*pos + 1 # The leaf at pos is empty now. Put newitem there, and bubble it up # to its final resting place (by sifting its parents down). heap[pos] = newitem _siftdown_max(heap, startpos, pos) def merge(*iterables, key=None, reverse=False): '''Merge multiple sorted inputs into a single sorted output. Similar to sorted(itertools.chain(*iterables)) but returns a generator, does not pull the data into memory all at once, and assumes that each of the input streams is already sorted (smallest to largest). >>> list(merge([1,3,5,7], [0,2,4,8], [5,10,15,20], [], [25])) [0, 1, 2, 3, 4, 5, 5, 7, 8, 10, 15, 20, 25] If *key* is not None, applies a key function to each element to determine its sort order. >>> list(merge(['dog', 'horse'], ['cat', 'fish', 'kangaroo'], key=len)) ['dog', 'cat', 'fish', 'horse', 'kangaroo'] ''' h = [] h_append = h.append if reverse: _heapify = _heapify_max _heappop = _heappop_max _heapreplace = _heapreplace_max direction = -1 else: _heapify = heapify _heappop = heappop _heapreplace = heapreplace direction = 1 if key is None: for order, it in enumerate(map(iter, iterables)): try: next = it.__next__ h_append([next(), order * direction, next]) except StopIteration: pass _heapify(h) while len(h) > 1: try: while True: value, order, next = s = h[0] yield value s[0] = next() # raises StopIteration when exhausted _heapreplace(h, s) # restore heap condition except StopIteration: _heappop(h) # remove empty iterator if h: # fast case when only a single iterator remains value, order, next = h[0] yield value yield from next.__self__ return for order, it in enumerate(map(iter, iterables)): try: next = it.__next__ value = next() h_append([key(value), order * direction, value, next]) except StopIteration: pass _heapify(h) while len(h) > 1: try: while True: key_value, order, value, next = s = h[0] yield value value = next() s[0] = key(value) s[2] = value _heapreplace(h, s) except StopIteration: _heappop(h) if h: key_value, order, value, next = h[0] yield value yield from next.__self__ # Algorithm notes for nlargest() and nsmallest() # ============================================== # # Make a single pass over the data while keeping the k most extreme values # in a heap. Memory consumption is limited to keeping k values in a list. # # Measured performance for random inputs: # # number of comparisons # n inputs k-extreme values (average of 5 trials) % more than min() # ------------- ---------------- --------------------- ----------------- # 1,000 100 3,317 231.7% # 10,000 100 14,046 40.5% # 100,000 100 105,749 5.7% # 1,000,000 100 1,007,751 0.8% # 10,000,000 100 10,009,401 0.1% # # Theoretical number of comparisons for k smallest of n random inputs: # # Step Comparisons Action # ---- -------------------------- --------------------------- # 1 1.66 * k heapify the first k-inputs # 2 n - k compare remaining elements to top of heap # 3 k * (1 + lg2(k)) * ln(n/k) replace the topmost value on the heap # 4 k * lg2(k) - (k/2) final sort of the k most extreme values # # Combining and simplifying for a rough estimate gives: # # comparisons = n + k * (log(k, 2) * log(n/k) + log(k, 2) + log(n/k)) # # Computing the number of comparisons for step 3: # ----------------------------------------------- # * For the i-th new value from the iterable, the probability of being in the # k most extreme values is k/i. For example, the probability of the 101st # value seen being in the 100 most extreme values is 100/101. # * If the value is a new extreme value, the cost of inserting it into the # heap is 1 + log(k, 2). # * The probability times the cost gives: # (k/i) * (1 + log(k, 2)) # * Summing across the remaining n-k elements gives: # sum((k/i) * (1 + log(k, 2)) for i in range(k+1, n+1)) # * This reduces to: # (H(n) - H(k)) * k * (1 + log(k, 2)) # * Where H(n) is the n-th harmonic number estimated by: # gamma = 0.5772156649 # H(n) = log(n, e) + gamma + 1 / (2 * n) # http://en.wikipedia.org/wiki/Harmonic_series_(mathematics)#Rate_of_divergence # * Substituting the H(n) formula: # comparisons = k * (1 + log(k, 2)) * (log(n/k, e) + (1/n - 1/k) / 2) # # Worst-case for step 3: # ---------------------- # In the worst case, the input data is reversed sorted so that every new element # must be inserted in the heap: # # comparisons = 1.66 * k + log(k, 2) * (n - k) # # Alternative Algorithms # ---------------------- # Other algorithms were not used because they: # 1) Took much more auxiliary memory, # 2) Made multiple passes over the data. # 3) Made more comparisons in common cases (small k, large n, semi-random input). # See the more detailed comparison of approach at: # http://code.activestate.com/recipes/577573-compare-algorithms-for-heapqsmallest def nsmallest(n, iterable, key=None): """Find the n smallest elements in a dataset. Equivalent to: sorted(iterable, key=key)[:n] """ # Short-cut for n==1 is to use min() if n == 1: it = iter(iterable) sentinel = object() result = min(it, default=sentinel, key=key) return [] if result is sentinel else [result] # When n>=size, it's faster to use sorted() try: size = len(iterable) except (TypeError, AttributeError): pass else: if n >= size: return sorted(iterable, key=key)[:n] # When key is none, use simpler decoration if key is None: it = iter(iterable) # put the range(n) first so that zip() doesn't # consume one too many elements from the iterator result = [(elem, i) for i, elem in zip(range(n), it)] if not result: return result _heapify_max(result) top = result[0][0] order = n _heapreplace = _heapreplace_max for elem in it: if elem < top: _heapreplace(result, (elem, order)) top, _order = result[0] order += 1 result.sort() return [elem for (elem, order) in result] # General case, slowest method it = iter(iterable) result = [(key(elem), i, elem) for i, elem in zip(range(n), it)] if not result: return result _heapify_max(result) top = result[0][0] order = n _heapreplace = _heapreplace_max for elem in it: k = key(elem) if k < top: _heapreplace(result, (k, order, elem)) top, _order, _elem = result[0] order += 1 result.sort() return [elem for (k, order, elem) in result] def nlargest(n, iterable, key=None): """Find the n largest elements in a dataset. Equivalent to: sorted(iterable, key=key, reverse=True)[:n] """ # Short-cut for n==1 is to use max() if n == 1: it = iter(iterable) sentinel = object() result = max(it, default=sentinel, key=key) return [] if result is sentinel else [result] # When n>=size, it's faster to use sorted() try: size = len(iterable) except (TypeError, AttributeError): pass else: if n >= size: return sorted(iterable, key=key, reverse=True)[:n] # When key is none, use simpler decoration if key is None: it = iter(iterable) result = [(elem, i) for i, elem in zip(range(0, -n, -1), it)] if not result: return result heapify(result) top = result[0][0] order = -n _heapreplace = heapreplace for elem in it: if top < elem: _heapreplace(result, (elem, order)) top, _order = result[0] order -= 1 result.sort(reverse=True) return [elem for (elem, order) in result] # General case, slowest method it = iter(iterable) result = [(key(elem), i, elem) for i, elem in zip(range(0, -n, -1), it)] if not result: return result heapify(result) top = result[0][0] order = -n _heapreplace = heapreplace for elem in it: k = key(elem) if top < k: _heapreplace(result, (k, order, elem)) top, _order, _elem = result[0] order -= 1 result.sort(reverse=True) return [elem for (k, order, elem) in result] # If available, use C implementation try: from _heapq import * except ImportError: pass try: from _heapq import _heapreplace_max except ImportError: pass try: from _heapq import _heapify_max except ImportError: pass try: from _heapq import _heappop_max except ImportError: pass if __name__ == "__main__": import doctest # pragma: no cover print(doctest.testmod()) # pragma: no cover
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