Created
January 6, 2023 04:14
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construct_max
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from functools import lru_cache | |
def construct_max(s: str) -> int: | |
# run in O(len(s)**2) | |
@lru_cache(None) | |
def dp(start, end) -> int: | |
num_s = int(s[start]) | |
num_e = int(s[end]) | |
if start == end: | |
return num_s | |
haha = 10**(end-start) | |
use_start = num_s * haha + dp(start+1, end) | |
use_end = num_e * haha + dp(start, end-1) | |
return max(use_start, use_end) | |
return dp(0, len(s)-1) | |
print(construct_max('53123')) # 53321 | |
print(construct_max('001000')) # 1000 |
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