dailyprogrammer Challenges done so far: Easy Longest Two-Character Sub-String #130 Roll the Dies #131 Who tests the tests? #132 Greatest Common Divisor #133 Foot-Traffic Analysis #134 N-Divisible Digits #135 Arithmetic Equations #136 Student Management Intermediate #128 Covering Potholes #129 N-Dimensional Vectors #130 Foot-Traffic Generator