how does RE# find the leftmost-longest match efficiently? remember the bidirectional scanning we mentioned earlier - run the DFA right to left to find all possible match starts, then run a reversed DFA left to right to find the ends. the leftmost start paired with the rightmost end gives you leftmost-longest. two linear DFA scans, no backtracking, no ambiguity.
Medium (5 to 6 out of 10)
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Oil prices spiked above $70 per barrel on Monday, while the international standard Brent crude hit $79. A key oil exporter, Iran shipped out an estimated 1.9 million barrels of crude per day, according to International Energy Agency data from December 2025.
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