[ohgyulim] WEEK 03 solutions #1800
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jangwonyoon
approved these changes
Aug 9, 2025
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| import java.util.*; | ||
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| class Solution { | ||
| List<List<Integer>> answer = new ArrayList<>(); | ||
| public List<List<Integer>> combinationSum(int[] candidates, int target) { | ||
| Arrays.sort(candidates); | ||
| recur(new ArrayList<Integer>(), candidates, target, 0, 0); | ||
| return answer; | ||
| } | ||
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| public void recur(List<Integer> result, int[] candidates, int target, int sum, int index) { | ||
| if (sum == target) { | ||
| List<Integer> deepCopyRes = new ArrayList<>(result); | ||
| answer.add(deepCopyRes); | ||
| return; | ||
| } | ||
| for (int i = index; i < candidates.length; i++) { | ||
| if (sum + candidates[i] <= target) { | ||
| result.add(candidates[i]); | ||
| recur(result, candidates, target, sum + candidates[i], i); | ||
| result.remove(Integer.valueOf(candidates[i])); | ||
| } | ||
| } | ||
| } | ||
| } |
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백트래킹으로 깔끔하게 잘 푸신거 같습니다.
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| public int hammingWeight(int n) { | ||
| return Integer.bitCount(n); | ||
| } |
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자바는 이렇게 내장함수로 풀 수있는 방법이 되게 좋네요. 다만 꼭 내장함수 말고도 풀수있는 방법이 있다면 고민해보시는것도 좋을거 같아요.
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