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Array39.java
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69 lines (67 loc) · 1.95 KB
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package array;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;
/**
* @ProjectName: leetcode
* @Package: array
* @ClassName: Array39
* @Author: markey
* @Description:39. 组合总和
* 给定一个无重复元素的数组 candidates 和一个目标数 target ,找出 candidates 中所有可以使数字和为 target 的组合。
*
* candidates 中的数字可以无限制重复被选取。
*
* 说明:
*
* 所有数字(包括 target)都是正整数。
* 解集不能包含重复的组合。
* 示例 1:
*
* 输入: candidates = [2,3,6,7], target = 7,
* 所求解集为:
* [
* [7],
* [2,2,3]
* ]
* 示例 2:
*
* 输入: candidates = [2,3,5], target = 8,
* 所求解集为:
* [
* [2,2,2,2],
* [2,3,3],
* [3,5]
* ]
*
* 来源:力扣(LeetCode)
* 链接:https://leetcode-cn.com/problems/combination-sum
* 著作权归领扣网络所有。商业转载请联系官方授权,非商业转载请注明出处。
* @Date: 2020/5/25 21:50
* @Version: 1.0
*/
public class Array39 {
public List<List<Integer>> combinationSum(int[] candidates, int target) {
List<List<Integer>> res = new ArrayList<>();
for (int i = 0; i < candidates.length; i++) {
if (candidates[i] == target) {
List<Integer> temp = new ArrayList<>();
temp.add(candidates[i]);
res.add(temp);
continue;
}
if (candidates[i] < target) {
int temp = candidates[i];
List<List<Integer>> subList = combinationSum(candidates, target - candidates[i]);
subList.forEach(sub -> {
sub.add(temp);
Collections.sort(sub);
res.add(sub);
});
continue;
}
}
return res.stream().distinct().collect(Collectors.toList());
}
}