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Update combinationSum README to reflect new implementation

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casca 2020-01-30 21:33:47 +01:00 committed by GitHub
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src/algorithms/sets/combination-sum/README.md
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@ -38,21 +38,22 @@ A solution set is:
## Explanations ## Explanations
Since the problem is to get all the possible results, not the best or the Since the problem is to get all the possible results, not the best or the
number of result, thus we don’t need to consider DP (dynamic programming), number of result, we don’t need to consider dynamic programming.
backtracking approach using recursion is needed to handle it. We do instead a depth-first traversal of the decision tree,
using an iterative implementation to avoid stack overflows.
Here is an example of decision tree for the situation when `candidates = [2, 3]` and `target = 6`: Here is an example of decision tree for the situation when `candidates = [2, 3]` and `target = 6`:
``` ```
0 0
/ \ / \
+2 +3 +3 +2
/ \ \ / \ \
+2 +3 +3 +3 +2 +2
/ \ / \ \ / \ \
+2 ✘ ✘ ✘ ✓ ✓ +2 +2
/ \ \ \
✓ ✘ ✘ ✓
``` ```
## References ## References