Backtracking & Recursion

Advanced

Backtracking is how you explore decision spaces — config generation, test case enumeration, constraint solvers.

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Foundations

SubsetsInclude/Exclude

Medium10m

PermutationsSwap Backtrack

Medium12m

Combination SumUnbounded Choices

Medium12m

Letter Combinations of PhoneCartesian Product

Medium12m

Palindrome PartitioningPartition + Check

Medium18m

Core

Word SearchGrid DFS

Medium18m

N-QueensColumn/Diagonal Sets

Hard25m

Sudoku SolverConstraint Propagation

Hard30m

Generate ParenthesesOpen/Close Count

Medium12m

Restore IP AddressesSegmented Backtrack

Medium15m