python队列、缺省字典、排序字典
import heapq
class PriorityQueue:
def __init__(self):
self....# nsmallest(n, iter) 返回iter中n个最小的元素
nums = [8, 1, 2, 3, 7, 5, 6, 4, 0, 9]
# 让列表具备堆特征,否则输出不按照堆的特性...) # Item('ddd')
# _queue=[],_index=4
from collections import defaultdict
# defaultdict是Python