🧠 Before you code — what pattern fits?
Balloons are intervals [xstart, xend] on the x-axis. An arrow shot at x bursts every balloon with xstart ≤ x ≤ xend. Return the minimum number of arrows to burst all balloons.
[[10,16],[2,8],[1,6],[7,12]] → 2
[[1,2],[3,4],[5,6]] → 3
🎬 Video explanation · NeetCodeIO
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