已结束 about advanced-challenge HOT 73 CLOSED

Python:
90. Subsets II
78. Subsets
77. Combinations
46. Permutations

from advanced-challenge.

https://leetcode.com/problems/subsets/discuss/2043072/JAVA-Backtracking

from advanced-challenge.

https://leetcode.com/problems/subsets/discuss/2043179/backtracking

from advanced-challenge.

78. 子集
https://leetcode.cn/problems/subsets/solution/by-yi-mo-shao-nu-f6iz/
90. 子集 II
https://leetcode.cn/problems/subsets-ii/solution/by-yi-mo-shao-nu-rgnm/
77. 组合
https://leetcode.cn/problems/combinations/solution/by-yi-mo-shao-nu-sg80/
39. 组合总和
https://leetcode.cn/problems/combination-sum/solution/by-yi-mo-shao-nu-58z7/
40. 组合总和 II
https://leetcode.cn/problems/combination-sum-ii/solution/40-zu-he-zong-he-ii-by-yi-mo-shao-nu-zs0g/
46. 全排列
https://leetcode.cn/problems/permutations/solution/46-quan-pai-lie-by-yi-mo-shao-nu-lo9k/
47. 全排列 II
https://leetcode.cn/problems/permutations-ii/solution/by-yi-mo-shao-nu-zw1a/

from advanced-challenge.

https://leetcode.com/problems/subsets/discuss/2043368/DFS
https://leetcode.com/problems/subsets-ii/discuss/2043780/DFS

from advanced-challenge.

https://leetcode.cn/problems/permutations/solution/hui-su-wen-ti-by-pedantic-mcleanbpp-qal3/

from advanced-challenge.

https://leetcode.cn/problems/permutations-ii/solution/by-merlin218-g3ah/

from advanced-challenge.

https://leetcode.cn/problems/permutations-ii/solution/hui-su-wen-ti-tao-mo-ban-by-huan-lai-ku-e00lx/

from advanced-challenge.

https://leetcode.cn/problems/permutations-ii/solution/by-lfool-vz40/

from advanced-challenge.

• 78
  • https://leetcode.com/problems/subsets/discuss/2043673/java-dp-dfs-all-track
• 90
  • https://leetcode.com/problems/subsets-ii/discuss/2043699/Java-DP-DFS-all-track
• 77
  • https://leetcode.com/problems/combinations/discuss/2043728/Java-DP-DFS-all-track-actively-terminate-unsolvable-cases
• 39
  • https://leetcode.com/problems/combination-sum/discuss/2043747/Java-DP-DFS-all-track-singlton-direction-to-try-out-numbers
• 40
  • https://leetcode.com/problems/combination-sum-ii/discuss/2043771/Java-DP-DFS-all-track-sort-to-avoid-duplcation
• 216
  • https://leetcode.com/problems/combination-sum-iii/discuss/2043788/Java-DP-DFS-all-track-in-order-iteration
• 46
  • https://leetcode.com/problems/permutations/discuss/2043561/Java-DP-all-track
• 47
  • https://leetcode.com/problems/permutations-ii/discuss/2043849/Java-DP-DFS-all-track-sort-to-avoid-duplication

from advanced-challenge.

90 https://leetcode.cn/problems/subsets-ii/solution/by-long-5eu-seuu/
216 https://leetcode.cn/problems/combination-sum-iii/solution/hui-su-by-long-5eu-yxnr/
40 https://leetcode.cn/problems/combination-sum-ii/solution/hui-su-jianzhi-by-long-5eu-eg3p/

from advanced-challenge.

https://leetcode.cn/problems/subsets/solution/dfs-by-yuyaomao-h6y5/

from advanced-challenge.

https://leetcode.cn/problems/subsets/solution/by-sukey-f-wik6/

from advanced-challenge.

https://leetcode.cn/problems/subsets/solution/zi-ji-by-no-sky-oabm/
https://leetcode.cn/problems/subsets-ii/solution/zi-ji-ii-by-no-sky-l103/
https://leetcode.cn/problems/combinations/solution/zu-he-by-no-sky-zeb7/
https://leetcode.cn/problems/combination-sum/solution/zu-he-zong-he-by-no-sky-f4gg/
https://leetcode.cn/problems/combination-sum-ii/solution/zu-he-zong-he-ii-by-no-sky-msa1/
https://leetcode.cn/problems/combination-sum-iii/solution/zu-he-zong-he-iii-by-no-sky-nfph/

from advanced-challenge.

https://leetcode.cn/problems/subsets/solution/by-scuhzs-o6jo/

from advanced-challenge.

216：https://leetcode.cn/problems/combination-sum-iii/solution/by-lattr-4-nxz8/

from advanced-challenge.

Q78 子集：https://leetcode.cn/problems/subsets/solution/by-wan-70-ozd3/
Q90 子集重复：https://leetcode.cn/problems/subsets-ii/solution/by-wan-70-gkue/
Q77 组合：https://leetcode.cn/problems/combinations/solution/by-wan-70-6u9q/
Q39 组合总和：https://leetcode.cn/problems/combination-sum/solution/by-wan-70-cg4s/
Q40 组合总和2：https://leetcode.cn/problems/combination-sum-ii/solution/by-wan-70-3lxf/

from advanced-challenge.

https://leetcode.cn/problems/permutations/solution/by-moonno-h2sq/

from advanced-challenge.

https://leetcode.cn/problems/subsets/solution/by-fan-wang-7-uu5a/

from advanced-challenge.

https://leetcode.cn/problems/subsets/solution/by-yxian-sheng-7-4cro/

from advanced-challenge.

• 90 : https://leetcode.cn/problems/subsets-ii/solution/by-tab-o-jsi3/
• 216 ：https://leetcode.cn/problems/combination-sum-iii/solution/by-tab-o-sowg/
• 47 : https://leetcode.cn/problems/permutations-ii/solution/by-tab-o-tkc0/

from advanced-challenge.

CPP

• 78. 子集 https://leetcode.cn/problems/subsets/solution/by-li-jinze-t9ry/
• 90. 子集 II https://leetcode.cn/problems/subsets-ii/solution/by-li-jinze-o5ml/
• 77. 组合https://leetcode.cn/problems/combinations/solution/by-li-jinze-i90t/
• 39. 组合总和https://leetcode.cn/problems/combination-sum/solution/zuhe-by-li-jinze-4l50/
• 40. 组合总和 IIhttps://leetcode.cn/problems/combination-sum-ii/solution/by-li-jinze-4n7o/
• 216. 组合总和 IIIhttps://leetcode.cn/problems/combination-sum-iii/solution/by-li-jinze-jl8d/
• 46. 全排列https://leetcode.cn/problems/permutations/solution/by-li-jinze-n42g/
• 47. 全排列 IIhttps://leetcode.cn/problems/permutations/solution/by-li-jinze-n42g/

from advanced-challenge.

https://leetcode.cn/problems/permutations-ii/solution/by-lming-9-gvci/

from advanced-challenge.

https://leetcode.cn/problems/permutations/solution/by-mikeythief-4o3e/

from advanced-challenge.

47. 全排列 II https://leetcode.cn/problems/permutations-ii/solution/hui-by-nealcou-n401/

from advanced-challenge.

https://leetcode.cn/problems/partition-to-k-equal-sum-subsets/solution/by-geekvc-t-4m9r/
https://leetcode.cn/problems/permutations/solution/qu-an-pai-l-by-geekvc-t-x8jc/

from advanced-challenge.

https://leetcode.cn/problems/subsets/solution/zi-ji-by-vrikxgwzl4-8j49/

from advanced-challenge.

https://leetcode.cn/problems/subsets/solution/by-xiyou_peng_yu_yan-es4p/

from advanced-challenge.

cpp

• 78 子集 ，不带重复元素，不可重复使用 https://leetcode.cn/problems/subsets/solution/by-ningleexx-vylg/ 只能选择start之后的元素

• 77 组合，不带重复元素，不可重复使用https://leetcode.cn/problems/combinations/solution/by-ningleexx-qltl/ start只能遍历后面的

• 216 组合总数，不带重复元素，不可以重复使用 https://leetcode.cn/problems/combination-sum-iii/solution/216-zu-he-zhi-he-wu-zhong-fu-bu-neng-zho-os9m/ 退出条件限制了一下而已，start保证不会选到之前的

• 90 子集，带重复元素，不可重复使用 https://leetcode.cn/problems/subsets-ii/solution/by-ningleexx-v5ba/ 先排序；start只能遍历后面的；剪枝：每次选择重复元素只能使用第一个，剩下的全部剪枝掉

• 40 组合总数，带重复元素，不可以重复使用 https://leetcode.cn/problems/combination-sum-ii/solution/by-ningleexx-7ec2/ 排序；start之前不能用；相同数字只能用第一个

• 39 组合总数，不带重复元素，可以重复使用 https://leetcode.cn/problems/combination-sum/solution/by-ningleexx-zyva/ start可以重复利用；但是start之前的依旧不能使用

• 47 带重复数字全排列 https://leetcode.cn/problems/permutations-ii/solution/by-ningleexx-zoce/ 增加剪枝：保证重复数字使用的相对顺序，对于重复数字只有前面的数字使用了，后面的才能使用

from advanced-challenge.

https://leetcode.cn/problems/subsets/solution/huisu-by-smartdengc-zp2w/

from advanced-challenge.

https://leetcode.cn/problems/combinations/solution/hui-su-suan-fa-jie-jue-zu-he-wenti-by-sm-t716/

from advanced-challenge.

https://leetcode.cn/problems/subsets/solution/c-hui-su-jie-jue-zi-ji-by-yann-w-uj97/

from advanced-challenge.

https://leetcode.com/problems/subsets/discuss/2045640/Python-3-Backtraversing

https://leetcode.com/problems/permutations/discuss/2045720/Python-3-Backtraversing

from advanced-challenge.

https://leetcode.cn/problems/subsets/solution/by-unruffled-driscoll51z-fyze/
https://leetcode.cn/problems/combinations/solution/hui-su-jie-jue-zu-he-wen-ti-by-unruffled-3xt5/
https://leetcode.cn/problems/subsets-ii/solution/hui-su-by-unruffled-driscoll51z-st6h/

from advanced-challenge.

https://leetcode.cn/problems/subsets/solution/by-nelly-60h7/
https://leetcode-cn.com/problems/combinations/solution/hui-su-fa-jian-zhi-by-nelly-rqlw/
https://leetcode-cn.com/problems/combination-sum-iii/solution/hui-su-jian-zhi-by-nelly-og8s/
https://leetcode-cn.com/problems/subsets-ii/solution/by-nelly-yaue/

from advanced-challenge.

https://leetcode.com/problems/permutations-ii/discuss/2046243/Python-with-symple-methods

from advanced-challenge.

Java:
78. Subsets: https://leetcode.com/problems/subsets/discuss/2046300/Java
90. Subsets II: https://leetcode.com/problems/subsets-ii/discuss/2046301/Java
77. Combinations: https://leetcode.com/problems/combinations/discuss/2046303/java
39. Combination Sum: https://leetcode.com/problems/combination-sum/discuss/2046304/java
40. Combination Sum II: https://leetcode.com/problems/combination-sum-ii/discuss/2046305/java
216. Combination Sum III: https://leetcode.com/problems/combination-sum-iii/discuss/2046306/java
46. Permutations: https://leetcode.com/problems/permutations/discuss/2046307/java
47. Permutations II: https://leetcode.com/problems/permutations-ii/discuss/2046309/java

from advanced-challenge.

https://leetcode.cn/problems/subsets/solution/hui-su-xuan-ze-by-dm2q-ynzk/

from advanced-challenge.

https://leetcode.cn/problems/subsets/solution/by-jiangcheng-2021-zbsa/

from advanced-challenge.

https://leetcode.cn/problems/permutations-ii/solution/by-tina_huskie-geuk/

from advanced-challenge.

40.组合总数II
90.子集II
77.组合
78.子集

from advanced-challenge.

https://leetcode.com/problems/subsets/discuss/1883149/python3-dfs

from advanced-challenge.

[子集问题-除重 - 子集 II - 力扣（LeetCode）](https://leetcode.cn/problems/subsets-ii/solution/by-kou-ming-aszt/)
[全排列2-树层去重 - 全排列 II - 力扣（LeetCode）](https://leetcode.cn/problems/permutations-ii/solution/quan-pai-lie-by-kou-ming-rh5f/)

from advanced-challenge.

https://leetcode.cn/problems/subsets-ii/solution/zi-ji-er-by-sui-ji-guo-cheng-sui-ji-guo-w7hz/

from advanced-challenge.

https://leetcode.cn/problems/subsets/solution/hui-su-suan-fa-zi-ji-by-csseudaeaq-mr6o/

from advanced-challenge.

https://leetcode.cn/problems/subsets/solution/78-zi-ji-by-serendipityj-dvol/

from advanced-challenge.

https://leetcode.cn/problems/permutations-ii/solution/hui-su-by-bmy-4hml/

from advanced-challenge.

https://leetcode.com/problems/subsets/discuss/2047991/python-backtrack

from advanced-challenge.

https://leetcode.cn/problems/subsets/solution/hui-su-by-wu-jin-wei-lan-b-uvxx/

from advanced-challenge.

https://leetcode.com/problems/subsets/discuss/2048126/Python3-Backtrack-Solution-Explained
https://leetcode.com/problems/combinations/discuss/2048154/Python3-Backtrack-Solution-Explained
https://leetcode.com/problems/combination-sum-ii/discuss/2048229/Python3-Backtrack-Solution

from advanced-challenge.

https://leetcode.cn/problems/subsets/solution/by-remtimes-hyqo/

from advanced-challenge.

https://leetcode.cn/problems/permutations-ii/solution/by-yao-shi-kwow/

from advanced-challenge.

https://leetcode.cn/problems/combinations/solution/by-kf953741-za8d/

from advanced-challenge.

https://leetcode.cn/problems/combinations/solution/zu-he-by-hua-sk-twnp/

from advanced-challenge.

78: https://leetcode-cn.com/problems/subsets/solution/zi-ji-by-4iovekwz80-rs17/

from advanced-challenge.

https://leetcode.cn/problems/subsets/solution/78-zi-ji-by-bthyla-x0tk/
https://leetcode.cn/problems/combinations/solution/77-zu-he-by-bthyla-8bal/

from advanced-challenge.

https://leetcode.com/problems/subsets/discuss/1885622/java-solution-on-backtracking

from advanced-challenge.

https://leetcode.cn/problems/combination-sum/solution/zushu-by-zlzhangli-igb8/

from advanced-challenge.

Python3:
78. Subsets
https://leetcode.cn/problems/subsets/solution/goldenlimitjie-by-goldenlimit-q07a/

from advanced-challenge.

https://leetcode.cn/problems/subsets/solution/by-qing-niao-1111-6bco/

from advanced-challenge.

https://leetcode.cn/problems/subsets/solution/by-abc_cba-iqdm/

from advanced-challenge.

https://leetcode.cn/problems/subsets/solution/by-6oofy-turingj5y-hacs/

from advanced-challenge.

https://leetcode.com/problems/subsets/discuss/2071986/Java-solution

from advanced-challenge.

子集II： https://leetcode.cn/problems/subsets-ii/solution/huishuo-by-annanna-asuz/
组和： https://leetcode.cn/problems/combinations/solution/zu-he-hui-su-by-annanna-ex04/
组和总和：https://leetcode.cn/problems/combination-sum/solution/zu-he-zong-he-javahui-su-by-annanna-xmzc/
组和总和II ：https://leetcode.cn/problems/combination-sum-ii/solution/by-annanna-aevw/

from advanced-challenge.

https://leetcode.com/problems/subsets/discuss/1968558/JS

from advanced-challenge.

78.子集
https://leetcode.cn/problems/subsets/solution/by-estherstarry-r9hy/
90.子集II
https://leetcode.cn/problems/subsets-ii/solution/by-estherstarry-12hl/
77.组合
https://leetcode.cn/problems/combinations/solution/day1677zu-he-by-estherstarry-okb0/
39.组合总和
https://leetcode.cn/problems/combination-sum/solution/day-by-estherstarry-987l/
40.组合总和 II
https://leetcode.cn/problems/combination-sum-ii/solution/day16-by-estherstarry-75al/
47.全排列 II
https://leetcode.cn/problems/permutations-ii/solution/by-estherstarry-qyc6/

from advanced-challenge.

https://leetcode.cn/problems/combinations/solution/hui-su-by-annalovecode-pvm8/

from advanced-challenge.

https://leetcode.cn/problems/subsets-ii/solution/by-weigiegie-fjyr/

from advanced-challenge.

https://leetcode.cn/problems/subsets/solution/hui-su-by-yi-ci-guo-dg02/

from advanced-challenge.

https://leetcode.cn/problems/subsets/solution/by-ling-ling-ling-k-xgl8/

from advanced-challenge.

https://leetcode.cn/problems/subsets/solution/by-ling-ling-ling-k-xgl8/

from advanced-challenge.

https://leetcode.com/problems/combinations/discuss/2077935/Java-Solution

from advanced-challenge.

https://leetcode.cn/problems/subsets/solution/by-minnownino-4o47/

from advanced-challenge.