Given a list of non negative integers, arrange them such that they form the largest number.

Given a positive integer, return its corresponding column title as appear in an Excel sheet.

Given a column title as appear in an Excel sheet, return its corresponding column number.

Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M.

Given an unsorted array, find the maximum difference between the successive elements in its sorted form.

Given an integer array nums, find the contiguous subarray (containing at least one number) which has the largest sum and return its sum.

Given an integer array nums, find the contiguous subarray within an array (containing at least one number) which has the largest product.

Given two sorted integer arrays nums1 and nums2, merge nums2 into nums1 as one sorted array.

Given an array nums, write a function to move all 0's to the end of it while maintaining the relative order of the non-zero elements.

Given an array of integers, find if the array contains any duplicates.