class BinHeap:
def __init__(self):
self.heapList = [0]
self.currentSize = 0
def percUp(self,i):
while i // 2 > 0:
if self.heapList[i] < self.heapList[i // 2]:
tmp=self.heapList[i // 2]
self.heapList[i // 2] = self.heapList[i]
self.heapList[i] = tmp
i = i // 2
def insert(self,k):
self.heapList.append(k)
self.currentSize = self.currentSize + 1
self.percUp(self.currentSize)
def percDown(self,i):
while(i*2)<=self.currentSize:
mc=self.minChild(i)
if self.heapList[i] > self.heapList[mc]:
tmp=self.heapList[i]
self.heapList[i]=self.heapList[mc]
self.heapList[mc]=tmp
i=mc
def minChild(self,i):
if i*2+1>self.currentSize:
return i*2
else:
if self.heapList[i*2]<self.heapList[i*2+1]:
return i*2
else:
return i*2+1
def delMin(self):
retval=self.heapList[1]
self.heapList[1]=self.heapList[self.currentSize]
self.currentSize=self.currentSize-1
self.heapList.pop()
self.percDown(1)
return retval
def buildHeap(self,alist):
i=len(alist)//2
self.currentSize=len(alist)
self.heapList=[0]+alist[:]
while (i>0):
self.percDown(i)
i=i-1
bh = BinHeap()
bh.buildHeap([9,5,6,2,3])
print(bh.delMin())
print(bh.delMin())
print(bh.delMin())
print(bh.delMin())
print(bh.delMin())
