• 0023 - Merge k Sorted Lists
• 0041 - First Missing Positive
• 0042 - Trapping Rain Water
• 0123 - Best Time to Buy and Sell Stock III
• 0188 - Best Time to Buy and Sell Stock IV
• 0214 - Shortest Palindrome
• 0502 - IPO
• 0899 - Orderly Queue
• 1354 - Construct Target Array With Multiple Sums
• 1526 - Minimum Number of Increments on Subarrays to Form a Target Array