[Solved] Consider the following code snippet for the Jump Game problem.... Identify the subtle bug that causes incorrect results on some inputs. | Greedy Algorithms

Greedy Algorithms - Jump Game (Can Reach End?)

Consider the following code snippet for the Jump Game problem. Identify the subtle bug that causes incorrect results on some inputs. ```python def canJump(nums): maxReach = 0 for i, jump in enumerate(nums): if i >= maxReach: return False maxReach = max(maxReach, i + jump) return True ```

AThe condition should be 'if i > maxReach' instead of 'if i >= maxReach'

BmaxReach is not updated correctly with max()

CThe function should return False at the end instead of True

DThe loop should start from i=1 instead of i=0

Step-by-Step Solution

Solution:

Step 1: Analyze the condition 'if i >= maxReach'
This causes immediate failure when i equals maxReach, but position i might still be reachable.
Step 2: Correct condition is 'if i > maxReach'
Only if current index is beyond maxReach should we return False; equality means reachable.
Final Answer:
Option A -> Option A
Quick Check:
Off-by-one in condition causes premature failure [OK]

Quick Trick: Check strict inequality for reachability condition [OK]

Common Mistakes:

MISTAKES

Using >= instead of >
Misplacing return statements

Trap Explanation:

PITFALL

Using >= causes false negatives on reachable indices equal to maxReach.

Interviewer Note:

CONTEXT

Tests attention to boundary conditions in greedy implementation.

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More Greedy Algorithms Quizzes

Identify the subtle bug that causes incorrect results on some inputs.

Step 1: Analyze the condition 'if i >= maxReach'

Step 2: Correct condition is 'if i > maxReach'

Final Answer:

Quick Check:

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