题解 | 删除字符串中出现次数最少的字符

import sys
import math

str=input()
arr={}
for i in range(0,len(str)):
    if(str[i]>='a' and str[i]<='z'):
        arr[str[i]]=str.count(str[i])
# print(arr)
minarr=[]
min=math.inf # ★设置无穷大
# 把字典拿到
for k,v in arr.items():  
    if(v<min):
        min=v
        minarr=[]
        minarr.append(k)
    elif(v==min):
        minarr.append(k)
# print(minarr)
for i in range(0,len(minarr)):
    str=str.replace(minarr[i],"")
print(str)