Greedy Algorithms - Best Time to Buy and Sell Stock II
If the Best Time to Buy and Sell Stock II problem is modified to include a cooldown day after selling (you cannot buy the next day), which approach is best suited to solve this variant?
If the Best Time to Buy and Sell Stock II problem is modified to include a cooldown day after selling (you cannot buy the next day), which approach is best suited to solve this variant?
hard🔁 Follow Up Q10 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand cooldown constraint
After selling, buying is forbidden the next day, adding state dependency.Step 2: Analyze approaches
Greedy fails because it ignores cooldown; sorting is irrelevant; brute force is inefficient.Step 3: Use DP with states
Dynamic programming can track holding, sold, and cooldown states to maximize profit.Final Answer:
Option B -> Option BQuick Check:
Cooldown requires state-aware DP [OK]
Quick Trick: Cooldown needs DP with states, not greedy [OK]
Common Mistakes:
MISTAKES- Applying greedy ignoring cooldown
- Using sorting which doesn't handle constraints
- Using brute force without memoization causing inefficiency
Trap Explanation:
PITFALL- Greedy ignores cooldown, brute force is inefficient
Interviewer Note:
CONTEXT- Tests knowledge of problem variants and appropriate algorithms
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