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Prompt: Given an sorted(ascending order) array of integers and a target value, return the starting and ending index for the area with the target value. It must be solved in O(log n). [Read More]

Prompt: Given two integers, a numerator and a denominator, return the fraction in the string. For any repeating fractional part, surround it with parentheses. [Read More]

Prompt: Evaluate the value of an arithmetic expression in Reverse Polish Notation. Valid operators are +, -, *, and /. Each operand may be an integer or another expression. [Read More]

Prompt: Given a list of integers, nums, return all the triplets [nums[i], nums[j], nums[k]] such that i != j, i != k, and j != k, and nums[i] + nums[j] + nums[k] == 0. [Read More]

Prompt: Given a list, the possible elements are integers or lists, which also contains integers or list of integers, make a class that can iterate over the next integer of the flatten list. The flatten list is a 1 dimensional version of the original list where all elements are integers.... [Read More]