Leetcode 377 – Combination Sum IV | Recursion → Memoization → Tabulation
Автор: izumicode
Загружено: 2026-02-11
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Описание:
⏱️ Complexity Analysis
🔴 Recursion
Time Complexity: O(n^target) (exponential)
Space Complexity: O(target) (recursion stack)
👉 Problem: Too many repeated calls → TLE
🟡 Memoization (Top-Down DP)
Time Complexity: O(n × target)
Space Complexity: O(target) (dp + recursion stack)
👉 Stores already solved targets → faster than recursion
🟢 Tabulation (Bottom-Up DP)
Time Complexity: O(n × target)
Space Complexity: O(target)
👉 Iterative solution → fastest & most stable approach
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