54 lines
842 B
Bash
Executable File
54 lines
842 B
Bash
Executable File
#!/bin/bash
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#
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# ex1.bash: Advent2020 game, day 12/game 1.
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CMD=${0##*/}
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shopt -s extglob
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declare -i X=0 Y=0
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declare -i DIRECTION=90 REAL
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while read -r line; do
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C=${line:0:1}
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A=${line:1}
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#printf "CMD=%s ARG=%d\n" "$C" "$A"
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case "$C" in
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R) ((DIRECTION=(DIRECTION+A)%360))
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#printf "D=%d\n" "$DIRECTION"
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;;
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L) ((DIRECTION=(DIRECTION+360-A)%360))
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#printf "D=%d\n" "$DIRECTION"
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;;
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F) REAL=$DIRECTION
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;;
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N) REAL=0
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;;
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S) REAL=180
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;;
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E) REAL=90
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;;
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W) REAL=270
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;;
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esac
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if [[ "$C" != "R" && "$C" != "L" ]]; then
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case "$REAL" in
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0) ((Y+=A))
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;;
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90) ((X+=A))
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;;
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180) ((Y-=A))
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;;
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270) ((X-=A))
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;;
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esac
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fi
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#printf "D=%3d POS=(%d,%d)\n" "$DIRECTION" "$X" "$Y"
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done
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((X<0)) && ((X=-X))
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((Y<0)) && ((Y=-Y))
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printf "%s : res=%d\n" "$CMD" $((X+Y))
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exit 0
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