81 lines
1.4 KiB
Bash
81 lines
1.4 KiB
Bash
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#!/bin/bash
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set -eu
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main() {
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local targ="$1"
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shift
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local vals="$@"
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#echo "solving for $targ using $vals"
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for v in $vals ; do
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if [[ $v == $targ ]] ; then
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echo won
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return 0
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fi
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done
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if [[ $# < 2 ]] ; then
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#echo "out of options"
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return 1
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fi
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declare -i i
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declare -i j
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declare -i k
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for (( i=1 ; i <= $# ; i++ )) ; do
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for (( j=$i ; j <= $# ; j++ )) ; do
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if [[ $i == $j ]] ; then
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continue
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fi
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declare -i iv=${!i}
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declare -i jv=${!j}
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local others=''
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for (( k=1 ; k <= $# ; k++ )) ; do
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if [[ $i == $k || $j == $k ]] ; then
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continue
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fi
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local kv=${!k}
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others="$others $kv"
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done
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if main $targ $others $(($iv + $jv)) ; then
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echo $iv + $jv = $(($iv + $jv))
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return 0
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fi
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if main $targ $others $(($jv - $iv)) ; then
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echo $jv - $iv = $(($jv - $iv))
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return 0
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fi
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if main $targ $others $(($iv - $jv)) ; then
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echo $iv - $jv = $(($iv - $jv))
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return 0
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fi
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if main $targ $others $(($iv * $jv)) ; then
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echo $iv x $jv = $(($iv * $jv))
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return 0
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fi
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if [[ $jv != 0 && $(( $iv % $jv )) == 0 ]] && \
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main $targ $others $(($iv / $jv)) ; then
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echo $iv / $jv = $(($iv / $jv))
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return 0
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fi
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if [[ $iv != 0 && $(( $jv % $iv )) == 0 ]] && \
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main $targ $others $(($jv / $iv)) ; then
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echo $jv / $iv = $(($jv / $iv))
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return 0
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fi
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done
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done
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#echo "no solution"
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return 1
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}
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main "$@"
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