Today I Learned(TIL) Algorithm Data Structure Priority Queue LeetCode 0014. Longest Common Prefix 0020. Valid Parentheses 0121. Best Time to Buy and Sell Stock 0872. Leaf-Similar Trees 1066. Compus Bikes II 1464. Maximum Product of Two Elements in an Array 1608. Special Array With X Elements Greater Than or Equal X 2482. Difference Between Ones and Zeros in Row and Column