Excel Sheet Problem: Given a String in method return the column number. Or in other words, convert Excel column number in integer. Input: "A" Output: 1 Input: "AA" Output: 27 Explaination: Column A is very first column in Excel, so return 1.
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count the 1s in an integer
What is binary search tree? Whats the time complexity of inserting? deleting? seaching? What's the time complexity for the worse case?
Given a random array with integers, find every pair that sum up to a certain number.
Given the daily stock prices of a share during last 30 days, write a program to find out best buying and selling dates for maximum gain. The program should run with O(n) complexity.
given an array of integers(positive or negative), and two integers x, y. write a function that can find a subarray whose sum equals to x and product equals to y
Write a method to decide if the given binary tree is a binary search tree or not.
Given a customer order of N items, design and implement a class that will most efficiently by space place the order in various size boxes
Given two lists, A and B, of sizes n and k, respectively, describe an algorithm to determine the intersection, C, of the two lists. What is the complexity of your algorithm? (The obvious solution is O(n*k)). Can you describe a solution that is faster? (An optimized solution can do it in O(n+k)).
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