49 lines
677 B
Bash
Executable File
49 lines
677 B
Bash
Executable File
#!/bin/bash
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#
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# ex2.bash: Advent2020 game, day 12/game 2.
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CMD=${0##*/}
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shopt -s extglob
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declare -i X=0 Y=0 WX=10 WY=1
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declare -i DIRECTION=90
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while read -r line; do
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C=${line:0:1}
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A=${line:1}
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DIRECTION=0
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case "$C" in
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R) ((DIRECTION=A))
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;;
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L) ((DIRECTION=360-A))
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;;
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F) for ((i=0; i<A; ++i)); do
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((X+=WX))
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((Y+=WY))
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done
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;;
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N) ((WY+=A))
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;;
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S) ((WY-=A))
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;;
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E) ((WX+=A))
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;;
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W) ((WX-=A))
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;;
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esac
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if ((DIRECTION > 0)); then
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for ((i=90; i<=DIRECTION; i+=90)); do
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((tx=WY))
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((WY=-WX))
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((WX=tx))
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done
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fi
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done
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((X<0)) && ((X=-X))
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((Y<0)) && ((Y=-Y))
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printf "%s : res=%d\n" "$CMD" $((X+Y))
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exit 0
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