Simple Python; sort + greedy

  • 0
    def min_arrows(ivals):
        if not ivals:
            return 0
        ivals.sort(key=lambda ival: ival[0])
        n_arrows, last = 1, ivals[0]
        for ival in ivals[1:]:
            last_start, last_end = last
            ival_start, ival_end = ival
            if ival_start <= last_end:
                last = max(last_start, ival_start), min(last_end, ival_end)
                last = ival
                n_arrows += 1
        return n_arrows

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