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back to board10+1 + 5+1 + 2 = 19.
And there is no other way 10+1+5+1=17 So what happens with the person with time 2? How is that possible?
M stands for mine detector.
1 2 5 10 M - empty
2 5 - 1 10 M (+10)
1 2 5 M - 10 (+1)
2 - 1 5 10 M (+5)
1 2 M - 5 10 (+1)
empty - 1 2 5 10 (+2)
10 + 1 + 5 + 1 + 2 = 19 Which is 19, not 17. That's why we are asking how can it be 17? 1 2 5 10 | --- = 0
5 10 | 1 2 = 2
1 5 10 | 2 = 3
1 | 5 10 2 = 13
1 2 | 5 10 = 15
--- | 1 2 5 10 = 17 |
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