sum-to

CLI app to list all the possible ways of summing to N. Helpful when solving killer sudokus

Install

npm i -g @binary-tree-syrup/sum-to

Usage

sum-to --help

Usage: sum-to <sum> [options]

CLI app to list all the possible ways of summing to N. Helpful when solving killer sudokus.

Arguments:
  sum                                The number to sum to. It must be a positive integer.

Options:
  -u, --using <amount>               The amount of summands to use. It must be a positive integer.
  -f, --from <summand...>            The list of valid summands. The default value is 1-9.
  -e, --excluding <not-summands...>  Numbers that should not be used as summands,
  -h, --help                         display help for command

Examples

$ sum-to 6 --using 2
Combinations of 2 numbers from 1,2,3,4,5,6,7,8,9 that sum to 6:
[ [ 1, 5 ], [ 2, 4 ] ]

$ sum-to 8 --using 3 --from 1-5
Combinations of 3 numbers from 1,2,3,4,5 that sum to 8:
[ [ 1, 2, 5 ], [ 1, 3, 4 ] ]

sum-to 18 --using 4 --excluding 3 9
Combinations of 4 numbers from 1,2,4,5,6,7,8 that sum to 18:
[ [ 1, 2, 7, 8 ], [ 1, 4, 5, 8 ], [ 1, 4, 6, 7 ], [ 2, 4, 5, 7 ] ]

$ sum-to 30 --using 5
Combinations of 5 numbers from 1,2,3,4,5,6,7,8,9 that sum to 30:
[
  [ 1, 5, 7, 8, 9 ],
  [ 2, 4, 7, 8, 9 ],
  [ 2, 5, 6, 8, 9 ],
  [ 3, 4, 6, 8, 9 ],
  [ 3, 5, 6, 7, 9 ],
  [ 4, 5, 6, 7, 8 ]
]

$ sum-to 30 -u 5 -e 2
Combinations of 5 numbers from 1,3,4,5,6,7,8,9 that sum to 30:
[
  [ 1, 5, 7, 8, 9 ],
  [ 3, 4, 6, 8, 9 ],
  [ 3, 5, 6, 7, 9 ],
  [ 4, 5, 6, 7, 8 ]
]