Segment Tree LeetCode Problems: All 41,
With Python Solutions

Every problem in this library that LeetCode tags Segment Tree. 33 of them carry a complete Python solution, a worked example and the time and space complexity of the approach.

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Easy: 0
Medium: 11
Hard: 30

Segment Tree problems by difficulty

Problems with a complete Python solution are listed first, then by ascending problem number.

Medium (11)

Medium problems
No.	Problem	Topics
0307	Range Sum Query - Mutable	Design, Binary Indexed Tree, Segment Tree +2
0406	Queue Reconstruction by Height	Binary Indexed Tree, Segment Tree, Array +1
0673	Number of Longest Increasing Subsequence	Binary Indexed Tree, Segment Tree, Array +1
0729	My Calendar I	Design, Segment Tree, Array +2
0731	My Calendar II	Design, Segment Tree, Array +3
1395	Count Number of Teams	Binary Indexed Tree, Segment Tree, Array +1
2080	Range Frequency Queries	Design, Segment Tree, Array +2
2424	Longest Uploaded Prefix	Union Find, Design, Binary Indexed Tree +5
0308	Range Sum Query 2D - MutablePremium	Design, Binary Indexed Tree, Segment Tree +2
2031	Count Subarrays With More Ones Than ZerosPremium	Binary Indexed Tree, Segment Tree, Array +5
2907	Maximum Profitable Triplets With Increasing Prices IPremium	Binary Indexed Tree, Segment Tree, Array

Hard (30)

Hard problems
No.	Problem	Topics
0218	The Skyline Problem	Binary Indexed Tree, Segment Tree, Array +5
0315	Count of Smaller Numbers After Self	Binary Indexed Tree, Segment Tree, Array +4
0327	Count of Range Sum	Binary Indexed Tree, Segment Tree, Array +4
0493	Reverse Pairs	Binary Indexed Tree, Segment Tree, Array +4
0699	Falling Squares	Segment Tree, Array, Ordered Set
0715	Range Module	Design, Segment Tree, Ordered Set
0732	My Calendar III	Design, Segment Tree, Binary Search +2
0850	Rectangle Area II	Segment Tree, Array, Ordered Set +1
1157	Online Majority Element In Subarray	Design, Binary Indexed Tree, Segment Tree +2
1505	Minimum Possible Integer After at Most K Adjacent Swaps On Digits	Greedy, Binary Indexed Tree, Segment Tree +1
1521	Find a Value of a Mysterious Function Closest to Target	Bit Manipulation, Segment Tree, Array +1
1622	Fancy Sequence	Design, Segment Tree, Math
1649	Create Sorted Array through Instructions	Binary Indexed Tree, Segment Tree, Array +4
1687	Delivering Boxes from Storage to Ports	Segment Tree, Queue, Array +4
2179	Count Good Triplets in an Array	Binary Indexed Tree, Segment Tree, Array +4
2213	Longest Substring of One Repeating Character	Segment Tree, Array, String +1
2276	Count Integers in Intervals	Design, Segment Tree, Ordered Set
2286	Booking Concert Tickets in Groups	Design, Binary Indexed Tree, Segment Tree +1
2407	Longest Increasing Subsequence II	Binary Indexed Tree, Segment Tree, Queue +4
2426	Number of Pairs Satisfying Inequality	Binary Indexed Tree, Segment Tree, Array +4
2569	Handling Sum Queries After Update	Segment Tree, Array
2659	Make Array Empty	Greedy, Binary Indexed Tree, Segment Tree +4
2736	Maximum Sum Queries	Stack, Binary Indexed Tree, Segment Tree +4
2926	Maximum Balanced Subsequence Sum	Binary Indexed Tree, Segment Tree, Array +2
2940	Find Building Where Alice and Bob Can Meet	Stack, Binary Indexed Tree, Segment Tree +4
0683	K Empty SlotsPremium	Binary Indexed Tree, Segment Tree, Queue +5
2158	Amount of New Area Painted Each DayPremium	Segment Tree, Array, Ordered Set
2519	Count the Number of K-Big IndicesPremium	Binary Indexed Tree, Segment Tree, Array +4
2916	Subarrays Distinct Element Sum of Squares II	Binary Indexed Tree, Segment Tree, Array +1
2921	Maximum Profitable Triplets With Increasing Prices IIPremium	Binary Indexed Tree, Segment Tree, Array

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python

Please analyze this context and help me answer the question or solve the problem.

Technical interview · 45 minsolution.pyShared editor · Python 3Longest substring without repeatsMediumGiven a string s, return the length of the longest contiguous substring in which every character is unique.s = "abcabcbb"
→ 31def length_of_longest_substring(s: str) -> int:2 last_seen = {}3 left = best = 04 for right, ch in enumerate(s):5 if ch in last_seen and last_seen[ch] >= left:

python

def length_of_longest_substring(s: str) -> int:    last_seen = {}                    # char -> index    left = best = 0    for right, ch in enumerate(s):        if ch in last_seen and last_seen[ch] >= left:            left = last_seen[ch] + 1  # jump past it        last_seen[ch] = right        best = max(best, right - left + 1)    return best    last_seen = {}                    # char -> index

Approach

At each index r, the window's left edge is:

left r = max (left r -1, last[s r] + 1)

Time O(n): each character enters and leaves the window once.
Space O(min(n, k)): k is the size of the character set.

Type your message...

GPT-6.1 Terra

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python

Please analyze this context and help me answer the question or solve the problem.

python

def length_of_longest_substring(s: str) -> int:    last_seen = {}                    # char -> index    left = best = 0    for right, ch in enumerate(s):        if ch in last_seen and last_seen[ch] >= left:            left = last_seen[ch] + 1  # jump past it        last_seen[ch] = right        best = max(best, right - left + 1)    return best    last_seen = {}                    # char -> index

Approach

At each index r, the window's left edge is:

left r = max (left r -1, last[s r] + 1)

Time O(n): each character enters and leaves the window once.
Space O(min(n, k)): k is the size of the character set.

Type your message...

GPT-6.1 TerraClear chat

QuitEscHide+QCapture+PCrop+OSubmit+EnterPress to get answerLeft/Right+Up/Down+

90%Subscription

python

Please analyze this context and help me answer the question or solve the problem.

python

def length_of_longest_substring(s: str) -> int:    last_seen = {}                    # char -> index    left = best = 0    for right, ch in enumerate(s):        if ch in last_seen and last_seen[ch] >= left:            left = last_seen[ch] + 1  # jump past it        last_seen[ch] = right        best = max(best, right - left + 1)    return best    last_seen = {}                    # char -> index

Approach

At each index r, the window's left edge is:

left r = max (left r -1, last[s r] + 1)

Time O(n): each character enters and leaves the window once.
Space O(min(n, k)): k is the size of the character set.

Type your message...

GPT-6.1 TerraClear chat

Primary display

QuitEscHide+QCapture+PCrop+OSubmit+EnterPress to get answerLeft/Right+Up/Down+

Segment Tree problems by difficulty

Medium (11)11

Hard (30)30

When the Segment Tree problem arrives live.

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Medium (11)

Hard (30)