Greedy Algorithms - Jump Game II (Minimum Jumps)
Given the greedy approach below, what is the output of jump([2,3,1,1,4])?
Given the greedy approach below, what is the output of jump([2,3,1,1,4])?
easy🧾 Code Trace Q3 of Q15
Step-by-Step Solution
Solution:
Step 1: Trace loop iterations
i=0: furthest=2, i==current_end=0 -> jumps=1, current_end=2 i=1: furthest=max(2,1+3=4)=4 i=2: furthest=max(4,2+1=3)=4, i==current_end=2 -> jumps=2, current_end=4Step 2: End loop as current_end reached last index
Loop ends, return jumps=2Final Answer:
Option B -> Option BQuick Check:
Output matches expected minimal jumps [OK]
Quick Trick: Greedy increments jumps at current_end index [OK]
Common Mistakes:
MISTAKES- Off-by-one in loop range
- Not updating current_end correctly
Trap Explanation:
PITFALL- Candidates often miscount jumps by updating current_end too late or early.
Interviewer Note:
CONTEXT- Tests ability to mentally execute greedy jump code.
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