From 97e5867fac9161200652c52dafa955df6805cdca Mon Sep 17 00:00:00 2001 From: fw_qaq Date: Wed, 22 Feb 2023 22:15:19 +0800 Subject: [PATCH] =?UTF-8?q?Update=200090.=E5=AD=90=E9=9B=86II.md?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- problems/0090.子集II.md | 34 +++++++++++++++++++++++++++++++--- 1 file changed, 31 insertions(+), 3 deletions(-) diff --git a/problems/0090.子集II.md b/problems/0090.子集II.md index 5df47986..a02161aa 100644 --- a/problems/0090.子集II.md +++ b/problems/0090.子集II.md @@ -440,7 +440,7 @@ impl Solution { let len = nums.len(); // if start_index >= len { return; } for i in start_index..len { - if i > 0 && nums[i] == nums[i - 1] && used[i - 1] == false { continue; } + if i > 0 && nums[i] == nums[i - 1] && !used[i - 1] { continue; } path.push(nums[i]); used[i] = true; Self::backtracking(result, path, nums, i + 1, used); @@ -449,11 +449,10 @@ impl Solution { } } - pub fn subsets_with_dup(nums: Vec) -> Vec> { + pub fn subsets_with_dup(mut nums: Vec) -> Vec> { let mut result: Vec> = Vec::new(); let mut path: Vec = Vec::new(); let mut used = vec![false; nums.len()]; - let mut nums = nums; nums.sort(); Self::backtracking(&mut result, &mut path, &nums, 0, &mut used); result @@ -461,6 +460,35 @@ impl Solution { } ``` +set 去重版本 + +```rust +use std::collections::HashSet; +impl Solution { + pub fn subsets_with_dup(mut nums: Vec) -> Vec> { + let mut res = HashSet::new(); + let mut path = vec![]; + nums.sort(); + Self::backtracking(&nums, &mut path, &mut res, 0); + res.into_iter().collect() + } + + pub fn backtracking( + nums: &Vec, + path: &mut Vec, + res: &mut HashSet>, + start_index: usize, + ) { + res.insert(path.clone()); + for i in start_index..nums.len() { + path.push(nums[i]); + Self::backtracking(nums, path, res, i + 1); + path.pop(); + } + } +} +``` + ### C ```c