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colin_stair_steps_space_optimised solution in Clear category for Stair Steps by colinmcnicholl
def checkio(numbers):
n = len(numbers)
dp = [0] * n
dp[1] = dp[2] = 0
for i in range(n):
dp[0] = numbers[i] + max(dp[1], dp[2])
dp[2] = dp[1]
dp[1] = dp[0]
return max(dp[1], dp[2])
#These "asserts" using only for self-checking and not necessary for auto-testing
if __name__ == '__main__':
assert checkio([5, -3, -1, 2]) == 6, 'Fifth'
assert checkio([5, 6, -10, -7, 4]) == 8, 'First'
assert checkio([-11, 69, 77, -51, 23, 67, 35, 27, -25, 95]) == 393, 'Second'
assert checkio([-21, -23, -69, -67, 1, 41, 97, 49, 27]) == 125, 'Third'
print('All ok')
Aug. 23, 2018
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