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397.py
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397.py
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__________________________________________________________________________________________________
class Solution:
def make_dp(function):
dp = {}
def helper(o, n):
if n not in dp:
dp[n] = function(o, n)
return dp[n]
return helper
@make_dp
def integerReplacement(self, n: int) -> int:
result = 0
if n == 1: return result
if n % 2 == 0:
result += (1 + self.integerReplacement(n / 2))
else:
result += (1 + min(self.integerReplacement(n + 1),
self.integerReplacement(n - 1)))
return result
__________________________________________________________________________________________________
sample 32 ms submission
class Solution:
def integerReplacement(self, n: int) -> int:
ops = 0
while n > 1:
if n % 2:
if n > 4 and n % 4 == 3:
n += 1
else:
n -= 1
else:
n >>= 1
ops += 1
return ops
__________________________________________________________________________________________________