Photon questions

Photon answers

• Height of heap with n elements
• Number of numbers in [L, R] with an odd number of odd factors
• Area of Union Of Rectangles using Segment Trees
• How to make a faster algorithm
• Arrange an integer array such that no two consecutive numbers sum is divisible by 3
• Maximize consumption Energy
• Best Time to Buy and Sell Stocks with the constraint of at most two transactions
• finding largest region with small difference more efficiently
• Find the unique elements of a vector C++