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GeezerVison is showing github.com — tech-code-interview/max_sum_increasing_subsequence.py at master · BarthJr/tech-code-interview

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max_sum_increasing_subsequence.py

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# Given an non-empty array of integers, write a function that returns an array of length 2.
# The first element in the output array should be an integer value representing the greatest sum that can be generated
# from a strictly-increasing subsequence in the array.
# The second element should be an array of the numbers in that subsequence.
# A subsequence is defined as a set of numbers that are not necessarily adjacent but
# that are in the same order as they appear in the array.
# Assume that there will only be one increasing subsequence with the greatest sum.
"""
>>> maxSumIncreasingSubsequence([10, 70, 20, 30, 50, 11, 30])
[110, [10, 20, 30, 50]]
>>> maxSumIncreasingSubsequence([8, 12, 2, 3, 15, 5, 7])
[35, [8, 12, 15]]
"""
def maxSumIncreasingSubsequence(array):
sums = array[:]
sequences = [None] * (len(array))
for i in range(len(array)):
for j in range(0, i):
if array[j] < array[i]:
if sums[j] + array[i] > sums[i]:
sums[i] = sums[j] + array[i]
sequences[i] = j
max_value = max(sums)
max_idx = sums.index(max_value)
sequence_path = get_sequence(array, sequences, max_idx)
return [max_value, sequence_path]
def get_sequence(array, sequences, max_idx):
result = []
num = max_idx
while num is not None:
result.append(array[num])
num = sequences[num]
return list(reversed(result))
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