Four people must cross a bridge in the dark, sharing one torch. At most two can cross at once, and they always move at the slower person’s pace.
Their crossing times: A = 1 min, B = 2 min, C = 5 min, D = 10 min.
Get all four across in 17 minutes.
Algorithmic · ★★★★☆ · ~15 min
The Bridge and the Torch
Sometimes you have to send your slowest people together — even if it feels wrong.
by MindYourPuzzle
Left side 🔦
A1mB2mC5mD10m
← 🔦
bridge
Right side
Elapsed0 min
Cross from left →
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