Level 2 · Core

Sorting

About 15 steps, from the first idea to a mastery test.

Stage 0Sort it first4 stepsFree
1. 1Position is rank7 min
2. 2Neighbours after sorting8 min
3. 3Choose what to sort by10 min
4. 4Sort, then two pointers10 min
Stage 1Comparing and swapping4 stepsFree
1. 1Swap your way along8 min
2. 2Pick the smallest, then move on8 min
3. 3Slide it into place9 min
4. 4How far from sorted?9 min
Stage 2Merge sort and counting4 stepsFree
1. 1Zip two sorted lists together12 min
2. 2Split, sort the halves, merge15 min
3. 3How out of order is it?16 min
4. 4When there are only a few kinds of value12 min
Stage 3Mastery3 stepsFree
1. 1Arrange for the biggest number14 min
2. 2Trains at the station12 min
3. 3Order by a score you compute10 min

Start free Try a step first