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Update climbing_stairs.py

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marina 2023-08-07 16:56:28 -07:00 committed by GitHub
parent 784b8a8698
commit 56c0e95516
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1 changed files with 6 additions and 6 deletions
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dynamic_programming/climbing_stairs.py
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@ -13,7 +13,7 @@ def climb_stairs_o2n(n: int) -> int:
if n == 0 or n == 1: if n == 0 or n == 1:
return 1 return 1
return climb_stairs_o2n(n-1) + climb_stairs_o2n(n-2) return climb_stairs_o2n(n - 1) + climb_stairs_o2n(n - 2)
def climb_stairs_memoization(n: int) -> int: def climb_stairs_memoization(n: int) -> int:
@ -24,7 +24,7 @@ def climb_stairs_memoization(n: int) -> int:
if n == 0 or n == 1: if n == 0 or n == 1:
return 1 return 1
if n not in memo: if n not in memo:
memo[n] = helper(n-1, memo) + helper(n-2, memo) memo[n] = helper(n - 1, memo) + helper(n - 2, memo)
return memo[n] return memo[n]
return helper(n, memo) return helper(n, memo)
@ -36,7 +36,7 @@ def climb_stairs_optimized(n: int) -> int:
return 1 return 1
prev, curr = 1, 1 prev, curr = 1, 1
for i in range(2, n+1): for i in range(2, n + 1):
temp = curr temp = curr
curr = prev + curr curr = prev + curr
prev = temp prev = temp
@ -49,10 +49,10 @@ def climb_stairs_tabulation(n: int) -> int:
if n == 0 or n == 1: if n == 0 or n == 1:
return 1 return 1
dp = [0] * (n+1) dp = [0] * (n + 1)
dp[0] = dp[1] = 1 dp[0] = dp[1] = 1
for i in range(2, n+1): for i in range(2, n + 1):
dp[i] = dp[i-1] + dp[i-2] dp[i] = dp[i - 1] + dp[i - 2]
return dp[n] return dp[n]