algorithm-python2/longest_increasing_sequence.py at master · yangjun616/algorithm-python2 · GitHub

Repository navigation

#!/usr/bin/python

#coding: utf-8

def isBiggerCompare(a, b):

return a > b

def findLIS(sequence, compare = isBiggerCompare):

n = len(sequence)

dp = [0 for i in range(n)]

track = [-1 for i in range(n)]

ans = 1

for i in range(1, n):

MAX = 0

for j in range(i):

if compare(sequence[i], sequence[j]) and MAX < dp[j]:

MAX = dp[j]

track[i] = j

# track[i] sequence[i]作为最长上升序列末项的前一项

dp[i] = MAX + 1

# dp[i] 以sequence[i]结尾的最长上升序列长度

if dp[i] > dp[ans]:

ans = i

ansList = [sequence[ans]]

while track[ans] != -1:

ans = track[ans]

ansList.insert(0, sequence[ans])

return ansList

if __name__ == '__main__':

s = [3, 1, 2, 1, 4, 3, 5]

print findLIS(s)