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online-election.py
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online-election.py
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# Time: ctor: O(n)
# q: O(logn)
# Space: O(n)
# In an election, the i-th vote was cast for persons[i] at time times[i].
#
# Now, we would like to implement the following query function:
# TopVotedCandidate.q(int t) will return the number of the person that was leading the election at time t.
#
# Votes cast at time t will count towards our query.
# In the case of a tie, the most recent vote (among tied candidates) wins.
#
# Example 1:
#
# Input: ["TopVotedCandidate","q","q","q","q","q","q"],
# [[[0,1,1,0,0,1,0],[0,5,10,15,20,25,30]],[3],[12],[25],[15],[24],[8]]
# Output: [null,0,1,1,0,0,1]
# Explanation:
# At time 3, the votes are [0], and 0 is leading.
# At time 12, the votes are [0,1,1], and 1 is leading.
# At time 25, the votes are [0,1,1,0,0,1], and 1 is leading (as ties go to the most recent vote.)
# This continues for 3 more queries at time 15, 24, and 8.
#
# Note:
# - 1 <= persons.length = times.length <= 5000
# - 0 <= persons[i] <= persons.length
# - times is a strictly increasing array with all elements in [0, 10^9].
# - TopVotedCandidate.q is called at most 10000 times per test case.
# - TopVotedCandidate.q(int t) is always called with t >= times[0].
import collections
import itertools
import bisect
class TopVotedCandidate(object):
def __init__(self, persons, times):
"""
:type persons: List[int]
:type times: List[int]
"""
lead = -1
self.__lookup, count = [], collections.defaultdict(int)
for t, p in itertools.izip(times, persons):
count[p] += 1
if count[p] >= count[lead]:
lead = p
self.__lookup.append((t, lead))
def q(self, t):
"""
:type t: int
:rtype: int
"""
return self.__lookup[bisect.bisect(self.__lookup,
(t, float("inf")))-1][1]
# Your TopVotedCandidate object will be instantiated and called as such:
# obj = TopVotedCandidate(persons, times)
# param_1 = obj.q(t)