Given a list of points (2D), find the pair of points which form the largest rectangle.

Given a list of points in 3D space, connect the 1000 closest nodes to each other. Calculate the product of the size of the 3 largest resulting regions?

You are given a map like this:

.......S.......
...............
.......^.......
...............
......^.^......
...............

A laser shines from the top S and splits each time it hits a ^, making this:

.......S.......
.......|.......
......|^|......
......|.|......
.....|^|^|.....
.....|.|.|.....

The two lasers in the center of this example merge to count as one laser.

Count how many times lasers hit splitters.

Given input like this:

123 328  51 64 
 45 64  387 23 
  6 98  215 314
*   +   *   +  

Apply the operation in each column then sum the results.

Given a list of ranges (inclusive) and a list of IDs, how many of the IDs are in any range?

Given a grid of solid @ and empty cells ., count how many solid cells have less than 4 neighbors.

Given a list of numbers, for each find the two digits in the number which if concatenated make the largest. Sum these values.

For example: 811111111111119 should be 89.

Implement a padlock with 100 values (0-99). Run each command (L23 to turn left by 23 places) and then output the number of times you landed on zero.