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发帖数: 12 | 2 来自主题: JobHunting版 - 请教一道题 S=47
p1=2,p2=3,p3=7
3,3,3,3,7,7,7,7,7,:(126 permutations)
3,3,3,3,3,3,3,3,3,3,3,7,7,:(78 permutations)
2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,:(16 permutations)
2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,:(2380 permutations)
2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,:(31824 permutations)
2,2,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,:(92378 permutations)
2,2,2,2,2,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,:(77520 permutations)
2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,3,3,3,3,3,:(20349 permutations)
2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,3,3,3,:(1 |
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k***t
发帖数: 276 | 3 S=max score
individual points p1,p2,...,pn
how many permutations of p1,...,pn (multiple occurences of px allowed) give
us total score S.
This is essentially based on American football, where each drive can end in
2 points (safety), 3 points (field goal), 6 points (td) or 7 points (td+fg).
Example:
S=47
p1=2,p2=4,p3=7
Answer: 226234 permutations
3,3,3,3,7,7,7,7,7,:(126 permutations)
3,3,3,3,3,3,3,3,3,3,3,7,7,:(78 permutations)
2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,:(16 permutations)
2,2,2,2,3,3,3,3,3,3... 阅读全帖 |
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k***t
发帖数: 276 | 4 S=max score
individual points p1,p2,...,pn
how many permutations of p1,...,pn (multiple occurences of px allowed) give
us total score S.
This is essentially based on American football, where each drive can end in
2 points (safety), 3 points (field goal), 6 points (td) or 7 points (td+fg).
Example:
S=47
p1=2,p2=4,p3=7
Answer: 226234 permutations
3,3,3,3,7,7,7,7,7,:(126 permutations)
3,3,3,3,3,3,3,3,3,3,3,7,7,:(78 permutations)
2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,:(16 permutations)
2,2,2,2,3,3,3,3,3,3... 阅读全帖 |
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