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RBRecursion vs Backtracking โ Stop Confusing Them
Recursion is just a technique.
A function calling itself to solve smaller subproblems.
Use recursion when:
โข You just need to count ways
โข You need max/min
โข You return true/false
โข No need to explicitly undo choices
Backtracking is recursion with choices.
Use backtracking when:
โข You have multiple options at each step
โข You need to explore all paths
โข You need to print all combinations/permutations
โข You follow: choose โ explore โ unchoose
Remember this:
Every backtracking is recursion, but not every recursion is backtracking.
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![#Backtracking Reel by @howtoalgo (verified account) - ๐ก ๐๐๐๐ค๐ญ๐ซ๐๐๐ค๐ข๐ง๐ ๐ข๐ง ๐๐๐ญ๐ข๐จ๐ง!
The Combination Sum problem shows how smart recursion saves time vs brute force.
From [2, 3, 6, 7] wit](https://image.pictame.com/img/557672534_17926964316133049_6557806824006164346_n.jpg?hash=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)
