CodingMediumcod-g858

Subject IntervalsLevel Mid–Senior~25 minCommon in Algorithms & data structures interviewsIndustries Software development

Question

Spherical balloons are taped to a wall, each spanning a horizontal closed interval [xstart, xend]. An arrow shot upward at coordinate x bursts every balloon whose interval contains x (xstart <= x <= xend); arrows travel infinitely high. Return the minimum number of arrows needed to burst all balloons.

Implement

find_min_arrows(points: list[list[int]]) → int

Examples

in[[[10,16],[2,8],[1,6],[7,12]]]out2

What a strong answer looks like

State your approach and its time/space complexity out loud before you optimize. Handle the edge cases (empty input, duplicates, overflow), and say why you chose this over the brute force. Green tests are the floor, not the grade.

Learn the concepts

Vibe coding: describe the solution in plain language (or narrate it) and the coach grades your approach. Generating runnable code from your description is coming next.

Run or narrate your approach, then ask the coach.