Visualizer

Choose an algorithm and data, then press Play or go step by step. The highlighted line of the pseudocode is the one being executed. Yellow bars are being compared, red ones have just changed. The counters show how much work the algorithm has done so far — compare them for different algorithms on the same data.

Race

Two algorithms on the same data, step for step. Try quick sort against bubble sort on 60 elements — this is what O(n log n) versus O(n²) looks like.

Every step comes from the real library code, recorded with trace.