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Copy pathInsertDeleteGetRandom.py
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59 lines (49 loc) · 1.56 KB
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
import random
class RandomizedSet(object):
def __init__(self):
"""
Initialize your data structure here.
"""
self.data_list = []
self.data_dict = {}
def insert(self, val):
"""
Inserts a value to the set. Returns true if the set did not already contain the specified element.
:type val: int
:rtype: bool
"""
if val not in self.data_dict:
self.data_dict[val] = len(self.data_list)
self.data_list.append(val)
return True
return False
def remove(self, val):
"""
Removes a value from the set. Returns true if the set contained the specified element.
:type val: int
:rtype: bool
"""
if val in self.data_dict:
index, last_data = self.data_dict[val], self.data_list[-1]
self.data_list[index] = last_data
self.data_dict[last_data] = index # update last_data position
self.data_list.pop() # remove the last data
self.data_dict.pop(val) # remove val in dict
return True
return False
"""
if val in self.pos:
idx, last = self.pos[val], self.nums[-1]
self.nums[idx], self.pos[last] = last, idx
self.nums.pop(); self.pos.pop(val, 0)
return True
return False
"""
def getRandom(self):
"""
Get a random element from the set.
:rtype: int
"""
return random.choice(self.data_list)