// pattern debugger≡ menu

// algorithm pattern debugger

Coding-interview patterns the way a debugger teaches them: one template per pattern, then a step-by-step trace of real state at every iteration. The same approach continues through how the machine runs code, how the network moves bytes, and system design. All code in modern C#, every snippet compiled and behavior-checked.

topics = 62
problems = 126
players = 13
start day_01 ▶see x, think ycheat_sheet
L
1
0
3
1
5
2
7
3
R
11
4
step 1/4
Start. Array is SORTED — that's the license to use opposite-end pointers. Target = 10.
L = 0
R = 4
target = 10

live: two_pointers on a sorted array. Click the player, then ◀▶ keys step.