Python选择排序、冒泡排序、合并排序代码实例
前两天刚装了python3.1.1,禁不住技痒写点code。
1.选择排序
>>>defSelSort(L):
length=len(L)
foriinrange(length-1):
minIdx=i
minVal=L[i]
j=i+1
whilej<length:
ifminVal>L[j]:
minIdx=j
minVal=L[j]
j=j+1
L[i],L[minIdx]=L[minIdx],L[i]
returnL
2.冒泡排序
>>>defbubSort(L):
swapped=True
whileswapped:
swapped=False
foriinrange(len(L)-1):
ifL[i]>L[i+1]:
L[i],L[i+1]=L[i+1],L[i]
swapped=True
returnL
3.合并排序
>>>defmerge(left,right):
result=[]
i,j=0,0
whilei<len(left)andj<len(right):
ifleft[i]<=right[j]:
result.append(left[i])
i=i+1
else:
result.append(right[j])
j=j+1
result+=left[i:]
result+=right[j:]
returnresult
>>>defmergesort(L): iflen(L)<2: returnL else: middle=int(len(L)/2) left=mergesort(L[:middle]) right=mergesort(L[middle:]) returnmerge(left,right)