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.obsidian/appearance.json vendored
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{ {
"theme": "moonstone", "theme": "obsidian",
"translucency": true, "translucency": true,
"cssTheme": "Prism", "cssTheme": "Prism",
"interfaceFontFamily": "IBM Plex Sans", "interfaceFontFamily": "IBM Plex Sans",

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} }
], ],
"collapse-display": false, "collapse-display": false,
"showArrow": false, "showArrow": true,
"textFadeMultiplier": 0, "textFadeMultiplier": 0,
"nodeSizeMultiplier": 1, "nodeSizeMultiplier": 1,
"lineSizeMultiplier": 1, "lineSizeMultiplier": 1,
"collapse-forces": false, "collapse-forces": false,
"centerStrength": 0.518713248970312, "centerStrength": 0.5,
"repelStrength": 10, "repelStrength": 10.5952380952381,
"linkStrength": 1, "linkStrength": 0.505952380952381,
"linkDistance": 250, "linkDistance": 259,
"scale": 0.9747267101258579, "scale": 0.34081054256054544,
"close": true "close": false
} }

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OJ notes/pages/Binary Search Algorithm.md
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##### Difficulty: ##### Difficulty:
#CS_analysis #difficulty-easy #CS_analysis #difficulty_easy
##### Related problems: ##### Related problems:

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OJ notes/pages/Bit-Manipulation count true trick.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #CS_analysis #difficulty-easy > #CS_analysis #difficulty_easy
> >
> ##### Additional tags: > ##### Additional tags:

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OJ notes/pages/Breadth First Search.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #CS_analysis #difficulty- > #CS_analysis #difficulty_
> >
> ##### Additional tags: > ##### Additional tags:

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OJ notes/pages/Floyd's Cycle Finding Algorithm.md
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##### Difficulty: ##### Difficulty:
#CS_analysis #difficulty-easy #CS_analysis #difficulty_easy
##### Related problems: ##### Related problems:

2
OJ notes/pages/Kadane's Algorithm.md
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##### Difficulty: ##### Difficulty:
#CS_analysis #difficulty-easy #CS_analysis #difficulty_easy
##### Time complexity: ##### Time complexity:

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OJ notes/pages/Leetcode 01-Matrix.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-medium > #coding_problem #difficulty_medium
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Add-Strings.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-easy > #coding_problem #difficulty_easy
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Average-Salary-Excluding-the-Minimum-and-Maximum-Salary.md
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> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-easy > #coding_problem #difficulty_easy
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Best-Time-To-Buy-And-Sell-Stock.md
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##### Difficulty: ##### Difficulty:
#leetcode #coding_problem #difficulty-easy #leetcode #coding_problem #difficulty_easy
##### Related topics: ##### Related topics:

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OJ notes/pages/Leetcode Binary-Search.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-easy > #coding_problem #difficulty_easy
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Binary-Tree-Inorder-Traversal.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-easy > #coding_problem #difficulty_easy
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Binary-Tree-Level-Order-Traversal.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-medium > #coding_problem #difficulty_medium
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Binary-Tree-Postorder-Traversal.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty- > #coding_problem #difficulty_
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Binary-Tree-Preorder-Traversal.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-easy > #coding_problem #difficulty_easy
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Check-If-It-Is-a-Straight-Line.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-easy > #coding_problem #difficulty_easy
> >
> ##### Additional tags: > ##### Additional tags:
> >

2
OJ notes/pages/Leetcode Climbing-Chairs.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-easy > #coding_problem #difficulty_easy
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Combinations.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-medium > #coding_problem #difficulty_medium
> >
> ##### Additional tags: > ##### Additional tags:
> >

2
OJ notes/pages/Leetcode Count-Odd-Numbers-in-an-Interval-Range.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-easy > #coding_problem #difficulty_easy
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Design-Hash.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-easy > #coding_problem #difficulty_easy
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode First-Bad-Version.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-easy > #coding_problem #difficulty_easy
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode First-Unique-Character-In-a-String.md
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##### Difficulty: ##### Difficulty:
#leetcode #coding_problem #difficulty-easy #leetcode #coding_problem #difficulty_easy
##### Related topics: ##### Related topics:

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OJ notes/pages/Leetcode Flood-Fill.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-easy > #coding_problem #difficulty_easy
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Group-Anagrams.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-medium > #coding_problem #difficulty_medium
> >
> ##### Additional tags: > ##### Additional tags:
> >
@ -68,6 +68,7 @@ An **Anagram** is a word or phrase formed by rearranging the letters of a differ
This one can be solved simply using two-way hash tables, This one can be solved simply using two-way hash tables,
consisting of two hash tables: consisting of two hash tables:
- ana2id: turn anagram into an id - ana2id: turn anagram into an id
- id2str: turn id into strings that has the anagrams - id2str: turn id into strings that has the anagrams
@ -76,6 +77,7 @@ CPP-style initialization of C's array.
> [!tip] > [!tip]
> CPP-style initialization of C array #tip > CPP-style initialization of C array #tip
>
> ```cpp > ```cpp
> array<int, 26> ana = {}; > array<int, 26> ana = {};
> ``` > ```

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OJ notes/pages/Leetcode Happy-Number.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-easy > #coding_problem #difficulty_easy
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode House-Robber.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-medium > #coding_problem #difficulty_medium
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Implement-Queue-Using-Stacks.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-easy > #coding_problem #difficulty_easy
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Increasing-Triplet-Subsequence.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-medium > #coding_problem #difficulty_medium
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Insert-Into-a-Binary-Search-Tree.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-medium > #coding_problem #difficulty_medium
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Intersection-of-Two-Arrays-II.md
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@ -16,7 +16,7 @@
##### Difficulty: ##### Difficulty:
#leetcode #coding_problem #difficulty-easy #leetcode #coding_problem #difficulty_easy
##### Related topics: ##### Related topics:

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OJ notes/pages/Leetcode Invert-Binary-Tree.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-easy > #coding_problem #difficulty_easy
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Largest-Perimeter-Triangle.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-easy > #coding_problem #difficulty_easy
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Letter-Case-Combination.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-medium > #coding_problem #difficulty_medium
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Linked-List-Cycle.md
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@ -14,7 +14,7 @@
##### Difficulty: ##### Difficulty:
#leetcode #coding_problem #difficulty-easy #leetcode #coding_problem #difficulty_easy
##### Related topics: ##### Related topics:

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OJ notes/pages/Leetcode Longest-Palindrome.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-easy > #coding_problem #difficulty_easy
> >
> ##### Additional tags: > ##### Additional tags:
> >
@ -30,7 +30,7 @@
### Problem ### Problem
Given a string `s` which consists of lowercase or uppercase letters, return _the length of the **longest palindrome**_ that can be built with those letters. Given a string `s` which consists of lowercase or uppercase letters, return *the length of the **longest palindrome*** that can be built with those letters.
Letters are **case sensitive**, for example, `"Aa"` is not considered a palindrome here. Letters are **case sensitive**, for example, `"Aa"` is not considered a palindrome here.
@ -61,6 +61,7 @@ Letters are **case sensitive**, for example, `"Aa"` is not considered a palindr
The solution is simple: count the apperances, sort it using The solution is simple: count the apperances, sort it using
std::greater<int>(), and select all even number, for odd std::greater<int>(), and select all even number, for odd
number `i`: number `i`:
- if odd numbers has been used: `ans += i - 1` (make it - if odd numbers has been used: `ans += i - 1` (make it
even) even)
- if not: `ans += i`, and mark odd number used - if not: `ans += i`, and mark odd number used

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OJ notes/pages/Leetcode Longest-Substring-Without-Repeating-Characters.md
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@ -12,7 +12,7 @@
> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-medium > #coding_problem #difficulty_medium
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Lowest-Common-Ancestor-Of-a-Binary-Search-Tree.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-easy > #coding_problem #difficulty_easy
> >
> ##### Additional tags: > ##### Additional tags:
> >

2
OJ notes/pages/Leetcode Max-Area-of-Island.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-medium > #coding_problem #difficulty_medium
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Maximum-Depth-Of-Binary-Tree.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-easy > #coding_problem #difficulty_easy
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Maximum-Difference-Between-Increasing-Elements.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-easy > #coding_problem #difficulty_easy
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Maxinum-subarray.md
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##### Difficulty: ##### Difficulty:
#leetcode #coding_problem #difficulty-easy #leetcode #coding_problem #difficulty_easy
##### Links: ##### Links:

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OJ notes/pages/Leetcode Merge-Intervals.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-medium > #coding_problem #difficulty_medium
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Merge-Sorted-Array.md
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##### Difficulty: ##### Difficulty:
#leetcode #coding_problem #difficulty-easy #leetcode #coding_problem #difficulty_easy
##### Related topics: ##### Related topics:

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OJ notes/pages/Leetcode Merge-Two-Binary-Trees.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-easy > #coding_problem #difficulty_easy
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Merge-Two-Sorted-Lists.md
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##### Difficulty: ##### Difficulty:
#leetcode #coding_problem #difficulty-easy #leetcode #coding_problem #difficulty_easy
##### Related topics: ##### Related topics:

2
OJ notes/pages/Leetcode Middle-of-the-Linked-List.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-easy > #coding_problem #difficulty_easy
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Move-Zeroes.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-easy > #coding_problem #difficulty_easy
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Next-Greater-Element-I.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-easy > #coding_problem #difficulty_easy
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Non-Overlapping-Intervals.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-medium > #coding_problem #difficulty_medium
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Number-of-1-Bits.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-easy > #coding_problem #difficulty_easy
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Partition-Labels.md
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> >
> ##### Difficulty: > ##### Difficulty:
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> #coding_problem #difficulty-medium > #coding_problem #difficulty_medium
> >
> ##### Additional tags: > ##### Additional tags:
> >
@ -62,6 +62,7 @@ A partition like "ababcbacadefegde", "hijhklij" is incorrect, because it splits
#### Why is it a greedy problem? #### Why is it a greedy problem?
Consider this situation: Consider this situation:
``` ```
s: ababc s: ababc
partition: abab|c partition: abab|c

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OJ notes/pages/Leetcode Pascal's-Triangle-II.md
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> >
> ##### Difficulty: > ##### Difficulty:
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> #coding_problem #difficulty-easy > #coding_problem #difficulty_easy
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Pascal's-Triangle.md
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##### Difficulty: ##### Difficulty:
#leetcode #coding_problem #difficulty-easy #leetcode #coding_problem #difficulty_easy
##### Related topics: ##### Related topics:

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OJ notes/pages/Leetcode Path-Sum.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-easy > #coding_problem #difficulty_easy
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Permutation-In-String.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-medium > #coding_problem #difficulty_medium
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Permutations.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-medium > #coding_problem #difficulty_medium
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Populating-Next-Right-Pointers-In-Each-Node.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-medium > #coding_problem #difficulty_medium
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Power-of-Two.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-medium > #coding_problem #difficulty_medium
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Product-of-Array-Except-Self.md
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> >
> ##### Difficulty: > ##### Difficulty:
> >
> #coding_problem #difficulty-medium > #coding_problem #difficulty_medium
> >
> ##### Additional tags: > ##### Additional tags:
> >
@ -25,7 +25,7 @@
##### Links: ##### Links:
- [Link to problem](https://leetcode.com/problems/product-of-array-except-self/) - [Link to problem](https://leetcode.com/problems/product-of-array-except-self/)
- [Solution with explanation](https://leetcode.com/problems/product-of-array-except-self/discuss/1597994/C%2B%2BPython-4-Simple-Solutions-w-Explanation-or-Prefix-and-Suffix-product-O(1)-space-approach) - [Solution with explanation](<https://leetcode.com/problems/product-of-array-except-self/discuss/1597994/C%2B%2BPython-4-Simple-Solutions-w-Explanation-or-Prefix-and-Suffix-product-O(1)-space-approach>)
--- ---
@ -148,6 +148,7 @@ public:
``` ```
First iteration: First iteration:
```cpp ```cpp
class Solution { class Solution {
public: public:

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OJ notes/pages/Leetcode Ransom-Note.md
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##### Difficulty: ##### Difficulty:
#leetcode #coding_problem #difficulty-easy #leetcode #coding_problem #difficulty_easy
##### Related topics: ##### Related topics:

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OJ notes/pages/Leetcode Remove-Duplicates-From-Sorted-List.md
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> >
> ##### Difficulty: > ##### Difficulty:
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> #coding_problem #difficulty-easy > #coding_problem #difficulty_easy
> >
> ##### Additional tags: > ##### Additional tags:
> >

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OJ notes/pages/Leetcode Remove-Linked-List-Elements.md
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##### Difficulty: ##### Difficulty:
#leetcode #coding_problem #difficulty-easy #leetcode #coding_problem #difficulty_easy
##### Related topics: ##### Related topics:

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OJ notes/pages/Leetcode Remove-Nth-Node-From-End-of-List.md
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> >
> ##### Difficulty: > ##### Difficulty:
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> #coding_problem #difficulty-medium > #coding_problem #difficulty_medium
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> ##### Additional tags: > ##### Additional tags:
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OJ notes/pages/Leetcode Repeated-DNA-Sequences.md
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> ##### Difficulty: > ##### Difficulty:
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> #coding_problem #difficulty-medium > #coding_problem #difficulty_medium
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> ##### Additional tags: > ##### Additional tags:
> >
@ -57,18 +57,21 @@ The question ask for an answer, and the substrings can
overlap. So, using a map is prefered(Why?) overlap. So, using a map is prefered(Why?)
Two reasons: Two reasons:
- Easy way to know if a array is a duplicate (set, map can - Easy way to know if a array is a duplicate (set, map can
suffice.) suffice.)
- Keep information on how many duplicates found, so we only - Keep information on how many duplicates found, so we only
append it to the answer the first time we meet it. append it to the answer the first time we meet it.
One trip-over hole: in the for loop, upper bound should be: One trip-over hole: in the for loop, upper bound should be:
```cpp ```cpp
for (int i = 0, top = s.size() - 9; i < top; i++) for (int i = 0, top = s.size() - 9; i < top; i++)
^^^ ^^^
``` ```
Minus 9, because 9 is the extended length for an subarray starting with i. Minus 9, because 9 is the extended length for an subarray starting with i.
``` ```
1234567890 1234567890
^ ^ ^ ^

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##### Difficulty: ##### Difficulty:
#leetcode #coding_problem #difficulty-easy #leetcode #coding_problem #difficulty_easy
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##### Lists: ##### Lists:

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@ -111,6 +111,7 @@ public:
``` ```
TLE, brute force TLE, brute force
```cpp ```cpp
class Solution { class Solution {
public: public:

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@ -65,6 +65,7 @@ The main part is using two hash tables, to check for
mismatches, and using `istringstream` to read from string mismatches, and using `istringstream` to read from string
Two hash tables: Two hash tables:
- One is used to check for s has one and only bound word - One is used to check for s has one and only bound word
- The other is used to check that the word is only stored - The other is used to check that the word is only stored
once once

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