03-24 [LeetCode][881. Boats to Save People] Greedy: Let the Heaviest Match the Lightest, if Not Matched, Let it Alone
03-22 [LeetCode][1663. Smallest String With A Given Numeric Value] Greedy O(n) Solution with Image Explanation
03-18 [LeetCode][316. Remove Duplicate Letters] The Detailed Explanation with 3-Steps to Understand the Stack Approach