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39. Combination Sum
Given a set of candidate numbers (candidates) (without duplicates) and a...
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16. 3Sum Closest
Given an array nums of n integers and an integer target, find three inte...
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22. Generate Parentheses
Given n pairs of parentheses, write a function to generate all combinati...
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5. Longest Palindromic Substring
Given a string s, find the longest palindromic substring in s. You may a...
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4. Median of Two Sorted Arrays
There are two sorted arrays nums1 and nums2 of size m and n respectively...
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120. Triangle
Given a triangle, find the minimum path sum from top to bottom. Each ste...
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137. Single Number II
Given a non-empty array of integers, every element appears three times e...
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121. Best Time to Buy and Sell Stock
Say you have an array for which the ith element is the price of a given ...