A. Tricky Ratio
Given the radius (r) of a circle you have to calculate the ratio between the circumference (C) of th...
B. Grid'y Rotations
Consider an M×N grid of numbers and then a series of (r,c) pairs. Each (r,c) pair corresponds to a p...
Implementation Easy 47/49/64
C. Prime Factors
Given an integer N, can you determine its prime factors?
NumberTheory Moderate 58/62/109
D. Cash Change
You have an unlimited number of cash notes of the following denominations: 1, 5, 10, 50, 100, 500. G...
Greedy, Implementation Very Easy 156/170/257