Interactive LeetCode walkthroughs

Watch the algorithm think.

Every solution is an execution-synced walkthrough: the data structure, the code, the variables, and the why of each step — all moving together under your control.

problems: 11
patterns: 8

Problems

#1Two Sum
EasyHashmap
#3Longest Substring Without Repeating Characters
MediumSliding window
#20Valid Parentheses
EasyStack
#167Two Sum II - Input Array Is Sorted
MediumTwo pointers
#224Basic Calculator
HardStack
#227Basic Calculator II
MediumStack
#322Coin Change
MediumDynamic programming
#560Subarray Sum Equals K
MediumPrefix sum + hashmap
#1047Removing Stars From a String
MediumStack
#1232Check If It Is a Straight Line
EasyGeometry
#1823Find the Winner of the Circular Game
MediumSimulation