算法小练习

倒排：

a="shdjcdda"
p=""
count=0
for j in range(0,len(a)) :
   for i in range(0,len(a)) :
       if j<=i :
           t=a[i-count]
   count=count+1
   p+=t
print(p)

排序：

__author__ = ‘Administrator‘
a=[5,8,16,1,74,2,3,85,24]
t=[]
for i in range(0,len(a)) :
    for j in range(0,len(a)) :
        if a[i]<a[j]:
            t=a[i]
            a[i]=a[j]
            a[j]=t
print(a)

算重复：

__author__ = ‘Administrator‘
a=[5,3,16,5,74,5,3,85,24]
t=[]
for i in a :
    count=0
    for j in a :
        if i==j:
            count=count+1
    if count>1:
        if i not in t:
          t.append(i)
          print(i,count)