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max_sum = cur = nums[0]
for n in nums[1:]:
cur = max(n, cur + n)
max_sum = max(max_sum, cur)
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Longest Palindromic Substring
Given a string s, return the longest palindromic substring in s. A palindrome reads the same forward and backward.
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Why is my two-sum solution O(n²)? How can I optimize it?
Your nested loop checks every pair — O(n²). Use a hash map to store numbers you've seen. Look up the complement in O(1) instead of scanning the whole array again. This brings it to O(n) time! 🚀
for i, n in enumerate(nums):
if target−n in seen: return ...
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Two Sum
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CompileMate Weekly #47
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