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Topic Cheat Sheet
Two Pointers
- Opposite EndsConverge from both sides of sorted input
- Same DirectionFast & slow pointers for partitioning
Dynamic Programming
- Fibonacci PatternBuild from base cases with rolling variables
- State TransitionDefine recurrence, memo or tabulate
Greedy Strategies
- Interval SchedulingSort by end time, pick non-overlapping
- Optimal SubstructureLocal best choice leads to global optimum
Bit Manipulation
- XOR TricksFind unique elements, toggle bits
- Bitmask DPSubset enumeration with bitmasks
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