[Solved] Consider the following Python function that finds the minimum number of arrows... Given the input points = [[10,16],[2,8],[1,6],[7,12]], what is the value of arrows after processing all intervals? | Intervals

Intervals - Minimum Number of Arrows to Burst Balloons

Consider the following Python function that finds the minimum number of arrows to burst balloons represented as intervals. Given the input points = [[10,16],[2,8],[1,6],[7,12]], what is the value of arrows after processing all intervals?

A1

B4

C3

D2

Step-by-Step Solution

Step 1: Sort intervals by end coordinate
Sorted points: [[1,6],[2,8],[7,12],[10,16]]
Step 2: Iterate and count arrows
Start with arrow_pos=6, arrows=1. Next interval start=2 ≤ 6 (covered), next start=7 > 6 (new arrow), arrows=2, arrow_pos=12. Next start=10 ≤ 12 (covered).
Final Answer:
Option D -> Option D
Quick Check:
Two arrows suffice to burst all balloons [OK]

Quick Trick: Sort by end, count arrows when start > current arrow position [OK]

Common Mistakes:

MISTAKES

Not sorting intervals before processing
Using start >= arrow_pos instead of start > arrow_pos
Off-by-one errors in counting arrows

Trap Explanation:

PITFALL

Confusing start > arrow_pos with start >= arrow_pos leads to overcounting arrows.

Interviewer Note:

CONTEXT

Checks candidate's ability to trace greedy interval coverage logic correctly.

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More Intervals Quizzes

Given the input points = [[10,16],[2,8],[1,6],[7,12]], what is the value of arrows after processing all intervals?

Step 1: Sort intervals by end coordinate

Step 2: Iterate and count arrows

Final Answer:

Quick Check:

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