Problem Relations Network¶

Problems and their related problems. Practice related problems together to reinforce patterns.

LeetCode 3 - Longest Substring Without Repeating Characters¶

🟡 Medium — Topics: string, hash_table, sliding_window

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Related Problems¶

• LeetCode 0159 (metadata not yet added)
• 🟡 LeetCode 340 - Longest Substring with At Most K Distinct Characters
• 🔴 LeetCode 76 - Minimum Window Substring
• 🟡 LeetCode 438 - Find All Anagrams in a String
• 🟡 LeetCode 209 - Minimum Size Subarray Sum
• 🟡 LeetCode 567 - Permutation in String
• LeetCode 0424 (metadata not yet added)

LeetCode 994 - Rotting Oranges¶

🟡 Medium — Topics: array, breadth_first_search, matrix

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Related Problems¶

• LeetCode 0286 (metadata not yet added)
• LeetCode 0542 (metadata not yet added)
• LeetCode 0127 (metadata not yet added)
• LeetCode 0752 (metadata not yet added)
• LeetCode 1091 (metadata not yet added)
• LeetCode 0200 (metadata not yet added)

LeetCode 2 - Add Two Numbers¶

🟡 Medium — Topics: linked_list, math, recursion

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Related Problems¶

• LeetCode 0043 (metadata not yet added)
• LeetCode 0067 (metadata not yet added)
• LeetCode 0371 (metadata not yet added)
• LeetCode 0415 (metadata not yet added)
• LeetCode 0445 (metadata not yet added)

LeetCode 76 - Minimum Window Substring¶

🔴 Hard — Topics: string, hash_table, sliding_window

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Related Problems¶

• 🟡 LeetCode 3 - Longest Substring Without Repeating Characters
• LeetCode 0030 (metadata not yet added)
• 🟡 LeetCode 209 - Minimum Size Subarray Sum
• 🟡 LeetCode 438 - Find All Anagrams in a String
• 🟡 LeetCode 567 - Permutation in String

LeetCode 209 - Minimum Size Subarray Sum¶

🟡 Medium — Topics: array, binary_search, sliding_window

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Related Problems¶

• 🟡 LeetCode 3 - Longest Substring Without Repeating Characters
• 🔴 LeetCode 76 - Minimum Window Substring
• LeetCode 0325 (metadata not yet added)
• LeetCode 0718 (metadata not yet added)
• LeetCode 0862 (metadata not yet added)

LeetCode 340 - Longest Substring with At Most K Distinct Characters¶

🟡 Medium — Topics: string, hash_table, sliding_window

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Related Problems¶

• 🟡 LeetCode 3 - Longest Substring Without Repeating Characters
• LeetCode 0159 (metadata not yet added)
• 🔴 LeetCode 76 - Minimum Window Substring
• LeetCode 0424 (metadata not yet added)
• LeetCode 0904 (metadata not yet added)

LeetCode 1 - Two Sum¶

🟢 Easy — Topics: array, hash_table

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Related Problems¶

• 🟡 LeetCode 15 - 3Sum
• LeetCode 0167 (metadata not yet added)
• LeetCode 0170 (metadata not yet added)
• LeetCode 0653 (metadata not yet added)

LeetCode 15 - 3Sum¶

🟡 Medium — Topics: array, two_pointers, sorting

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Related Problems¶

• 🟢 LeetCode 1 - Two Sum
• 🟡 LeetCode 16 - 3Sum Closest
• LeetCode 0018 (metadata not yet added)
• LeetCode 0167 (metadata not yet added)

LeetCode 23 - Merge k Sorted Lists¶

🔴 Hard — Topics: linked_list, divide_and_conquer, heap

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Related Problems¶

• 🟢 LeetCode 21 - Merge Two Sorted Lists
• 🔴 LeetCode 4 - Median of Two Sorted Arrays
• LeetCode 0378 (metadata not yet added)
• LeetCode 0264 (metadata not yet added)

LeetCode 438 - Find All Anagrams in a String¶

🟡 Medium — Topics: string, hash_table, sliding_window

📁 View Solution

Related Problems¶

• 🟡 LeetCode 3 - Longest Substring Without Repeating Characters
• 🔴 LeetCode 76 - Minimum Window Substring
• LeetCode 0242 (metadata not yet added)
• 🟡 LeetCode 567 - Permutation in String

LeetCode 567 - Permutation in String¶

🟡 Medium — Topics: string, hash_table, two_pointers

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Related Problems¶

• 🟡 LeetCode 3 - Longest Substring Without Repeating Characters
• 🔴 LeetCode 76 - Minimum Window Substring
• LeetCode 0242 (metadata not yet added)
• 🟡 LeetCode 438 - Find All Anagrams in a String

LeetCode 4 - Median of Two Sorted Arrays¶

🔴 Hard — Topics: array, binary_search, divide_and_conquer

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Related Problems¶

• 🔴 LeetCode 23 - Merge k Sorted Lists
• 🟢 LeetCode 21 - Merge Two Sorted Lists
• 🟡 LeetCode 215 - Kth Largest Element in an Array

LeetCode 11 - Container With Most Water¶

🟡 Medium — Topics: array, two_pointers, greedy

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Related Problems¶

• LeetCode 0042 (metadata not yet added)
• 🟢 LeetCode 125 - Valid Palindrome
• LeetCode 0167 (metadata not yet added)

LeetCode 21 - Merge Two Sorted Lists¶

🟢 Easy — Topics: linked_list, recursion

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Related Problems¶

• 🔴 LeetCode 23 - Merge k Sorted Lists
• 🟢 LeetCode 88 - Merge Sorted Array
• 🟢 LeetCode 977 - Squares of a Sorted Array

LeetCode 25 - Reverse Nodes in k-Group¶

🔴 Hard — Topics: linked_list, recursion

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Related Problems¶

• LeetCode 0024 (metadata not yet added)
• LeetCode 0206 (metadata not yet added)
• LeetCode 0092 (metadata not yet added)

LeetCode 26 - Remove Duplicates from Sorted Array¶

🟢 Easy — Topics: array, two_pointers

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Related Problems¶

• 🟢 LeetCode 27 - Remove Element
• 🟡 LeetCode 80 - Remove Duplicates from Sorted Array II
• 🟢 LeetCode 283 - Move Zeroes

LeetCode 125 - Valid Palindrome¶

🟢 Easy — Topics: two_pointers, string

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Related Problems¶

• 🟢 LeetCode 680 - Valid Palindrome II
• LeetCode 0005 (metadata not yet added)
• 🟢 LeetCode 125 - Valid Palindrome

LeetCode 16 - 3Sum Closest¶

🟡 Medium — Topics: array, two_pointers, sorting

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Related Problems¶

• 🟡 LeetCode 15 - 3Sum
• 🟢 LeetCode 1 - Two Sum

LeetCode 27 - Remove Element¶

🟢 Easy — Topics: array, two_pointers

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Related Problems¶

• 🟢 LeetCode 26 - Remove Duplicates from Sorted Array
• 🟢 LeetCode 283 - Move Zeroes

LeetCode 51 - N-Queens¶

🔴 Hard — Topics: array, backtracking

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Related Problems¶

• LeetCode 0052 (metadata not yet added)
• LeetCode 0037 (metadata not yet added)

LeetCode 75 - Sort Colors¶

🟡 Medium — Topics: array, two_pointers, sorting

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Related Problems¶

• 🟢 LeetCode 905 - Sort Array By Parity
• 🟢 LeetCode 922 - Sort Array By Parity II

LeetCode 80 - Remove Duplicates from Sorted Array II¶

🟡 Medium — Topics: array, two_pointers

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Related Problems¶

• 🟢 LeetCode 26 - Remove Duplicates from Sorted Array
• 🟢 LeetCode 27 - Remove Element

LeetCode 88 - Merge Sorted Array¶

🟢 Easy — Topics: array, two_pointers, sorting

📁 View Solution

Related Problems¶

• 🟢 LeetCode 21 - Merge Two Sorted Lists
• 🟢 LeetCode 977 - Squares of a Sorted Array

LeetCode 141 - Linked List Cycle¶

🟢 Easy — Topics: linked_list, two_pointers, hash_table

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Related Problems¶

• 🟡 LeetCode 142 - Linked List Cycle II
• 🟢 LeetCode 202 - Happy Number

LeetCode 142 - Linked List Cycle II¶

🟡 Medium — Topics: linked_list, two_pointers, hash_table

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Related Problems¶

• 🟢 LeetCode 141 - Linked List Cycle
• 🟢 LeetCode 202 - Happy Number

LeetCode 202 - Happy Number¶

🟢 Easy — Topics: hash_table, math, two_pointers

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Related Problems¶

• 🟢 LeetCode 141 - Linked List Cycle
• 🟡 LeetCode 142 - Linked List Cycle II

LeetCode 215 - Kth Largest Element in an Array¶

🟡 Medium — Topics: array, divide_and_conquer, sorting

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Related Problems¶

• LeetCode 0347 (metadata not yet added)
• LeetCode 0378 (metadata not yet added)

LeetCode 283 - Move Zeroes¶

🟢 Easy — Topics: array, two_pointers

📁 View Solution

Related Problems¶

• 🟢 LeetCode 27 - Remove Element
• 🟢 LeetCode 26 - Remove Duplicates from Sorted Array

LeetCode 876 - Middle of the Linked List¶

🟢 Easy — Topics: linked_list, two_pointers

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Related Problems¶

• 🟢 LeetCode 141 - Linked List Cycle
• 🟡 LeetCode 142 - Linked List Cycle II

LeetCode 905 - Sort Array By Parity¶

🟢 Easy — Topics: array, two_pointers, sorting

📁 View Solution

Related Problems¶

• 🟡 LeetCode 75 - Sort Colors
• 🟢 LeetCode 922 - Sort Array By Parity II

LeetCode 922 - Sort Array By Parity II¶

🟢 Easy — Topics: array, two_pointers

📁 View Solution

Related Problems¶

• 🟢 LeetCode 905 - Sort Array By Parity
• 🟡 LeetCode 75 - Sort Colors

LeetCode 977 - Squares of a Sorted Array¶

🟢 Easy — Topics: array, two_pointers, sorting

📁 View Solution

Related Problems¶

• 🟢 LeetCode 21 - Merge Two Sorted Lists
• 🟢 LeetCode 88 - Merge Sorted Array

LeetCode 680 - Valid Palindrome II¶

🟢 Easy — Topics: two_pointers, string, greedy

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Related Problems¶

• 🟢 LeetCode 125 - Valid Palindrome