pathSum += i;//递归backtrack(n, k, i +1);//回溯,撤销操作pathSum -= path.pop(); } } } LeetCode39. 组合总和 ☕ 题目:39. 组合总和 (https://leetcode-cn.com/problems/combination-sum/) ❓ 难度:中等 描述: 给定一个无重复元素的正整数数组 candidates 和一个正整数 target ,找出 can...
题解:https://leetcode-cn.com/problems/permutations-ii/solution/47hui-su-jian-zhi-zhong-fu-shu-by-bu-zhi-h7dm/ 主要讲一下为什么剪枝条件加了一个!used[i-1]?其实图里也很清楚,我们知道重复必定发生在决策树的同一层,当我们只有i>0 && nums[i] == nums[i-1]时,有一种可能是nums[i-1]和...
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