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Interview Prep

L3PRO· 100 lessons

LeetCode patterns in Python + behavioral STAR

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100 lessons across 6 modules: Big-O & easy patterns, arrays/strings/two-pointer, trees + graphs + BFS/DFS, DP + heap + tries, system design + STAR behavioral, plus concurrency/OS/ML interview topics and a full mock-onsite capstone.

📋 WHAT YOU'LL LEARN

Big-O complexity intro · Two pointers: pair sum · Two pointers: palindrome check · Sliding window: max sum · Sliding window: longest unique substring · Hash maps: anagram check · +10 more

1
Big-O complexity intro
quizFREE
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2
Two pointers: pair sum
codeFREE
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3
Two pointers: palindrome check
code75 XP🔒 PRO
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4
Sliding window: max sum
code100 XP🔒 PRO
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5
Sliding window: longest unique substring
code100 XP🔒 PRO
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6
Hash maps: anagram check
code75 XP🔒 PRO
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7
Hash maps: two-sum
code75 XP🔒 PRO
→
8
Binary search basics
code100 XP🔒 PRO
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9
Stack: valid parentheses
code75 XP🔒 PRO
→
10
Linked list reversal
code100 XP🔒 PRO
→
11
Tree DFS: max depth
code100 XP🔒 PRO
→
12
Tree BFS: level order
code100 XP🔒 PRO
→
13
Recursion: backtracking permutations
code100 XP🔒 PRO
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14
Dynamic programming: climbing stairs
code125 XP🔒 PRO
→
15
Behavioral: the STAR framework
quiz100 XP🔒 PRO
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16
Hash map: subarray sum = K
code100 XP🔒 PRO
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Tip: click any lesson to revisit it. After your first attempt, the “Show example” button reveals the full solution.