176 lines
3.3 KiB
Bash
Executable File
176 lines
3.3 KiB
Bash
Executable File
#!/bin/bash
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#
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# ex1-slow.bash: Advent2020 game, day 11/game 1.
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CMD=${0##*/}
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shopt -s extglob
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declare -a rowsstr rows
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declare -i RLENGTH
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declare -i NROWS
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declare floor
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function adj() {
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local -i r="$1" n="$2" c="$3" count=0
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local -a prow=(${rows[r-1]})
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local -a row=(${rows[r]})
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local -a nrow=(${rows[r+1]})
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#echo
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#echo p="${prow[*]}"
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#echo r="${row[*]}"
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#echo p1=${prow[1]}
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#echo r1=${row[1]}
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#return
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#echo r="$row"
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#echo n="$nrow"
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if (( row[n] == 0 )); then
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echo "-1"
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return
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fi
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for ((i=n-1; i<n+2; ++i)); do
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#echo p: $i ${prow:i:1}
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(( prow[i] == c )) && ((count++))
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#echo p: $i ${nrow:i:1}
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(( nrow[i] == c )) && ((count++))
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done
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(( row[n-1] == c )) && ((count++))
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(( row[n+1] == c )) && ((count++))
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echo "$count"
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}
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function run() {
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local -i c r
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local -a row
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local -a new
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local -i cur
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local -i changed=1
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local -i loop=0 seated=0
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#echo "$floor;"
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while ((changed > 0)); do
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changed=0
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seated=0
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for ((r=1; r<=NROWS; ++r)); do
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row=(${rows[r]})
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newrow=(0)
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for ((c=1; c<=RLENGTH; ++c)); do
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newrow+=("${row[c]}")
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#if ((r == 1 && c ==1 )); then
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# printf "r1c1: %s %d\n" "${row[c]}" $(adj $r $c 2)
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#fi
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case ${row[c]} in
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0) continue
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;;
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1) if (( $(adj $r $c 2) == 0 )); then
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((++changed))
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newrow[c]=2
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fi
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#printf "[%d][%d]: %s %s %d\n" $r $c "${row[c]}" "${newrow[c]}" $(adj $r $c 2)
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;;
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2) if (( $(adj $r $c 2) >= 4 )); then
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((++changed))
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newrow[c]=1
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fi
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;;
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esac
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((newrow[c] == 2)) && ((seated++))
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done
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newrow+=(0)
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new[$r]="${newrow[*]}"
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#echo "${newrow[*]} ;"
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done
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#echo "$floor"
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#echo "${new[*]}"
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#echo changed=$changed
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((loop++))
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#echo loop="$loop"
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for ((r=1; r<=NROWS; ++r)); do
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rows[r]="${new[$r]}"
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done
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#printf "loop %d seated %d\n" "$loop" "$seated" >&2
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done
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echo "$seated"
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}
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readarray -t rowsstr
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for ((i=0; i<${#rowsstr[@]}; ++i)); do
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rowsstr[i]=${rowsstr[i]//./0}
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rowsstr[i]=${rowsstr[i]//L/1}
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#echo "${rowsstr[i]}"
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done
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RLENGTH=${#rowsstr[0]}
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NROWS=${#rowsstr[@]}
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#echo "L=$RLENGTH N=$NROWS"
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# add floor rows at beginning and end
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printf -v floor '%0.s0 ' $(seq 1 $((RLENGTH+2)))
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#echo floor="$floor"
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#echo floor="$floor"
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#echo
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#for ((i=0; i<${#rowsstr[@]}; ++i)); do
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# rowsstr[i]=0${rowsstr[i]}0
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# echo "${rowsstr[i]}"
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#done
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# split arrays in integers
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for ((r=0; r<NROWS; ++r)); do
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srow="${rowsstr[r]}"
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nrow=(0)
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for ((c=0 ; c<=RLENGTH+1 ; c++ )); do
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nrow+=("${srow:c:1}")
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done
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nrow+=(0)
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rows[r]="${nrow[*]}"
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done
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rows=("$floor" "${rows[@]}" "$floor")
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#for ((r=0; r<=NROWS+1; ++r)); do
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# printf "row %d: %s\n" $r "${rows[r]}"
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#done
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#for ((r=0; r<=NROWS+1; ++r)); do
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# echo "row $r=${rows[r]}"
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#done
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#echo -n "adj 1 1 2: "
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#adj 1 1 2
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res=$(run)
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printf "%s: res=%d\n" "$CMD" "$res"
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exit 0
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echo -n "adj 1 1 2: "
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adj 1 1 2
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echo -n "adj 1 2 1: "
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adj 1 2 1
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echo -n "adj 1 3 2: "
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adj 1 3 2
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echo -n "adj 1 4 1: "
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adj 1 4 1
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exit 0
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numbers=(0 "${numbers[@]}")
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size=${#numbers[@]}
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((last=${numbers[size-1]}+3))
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numbers+=("$last")
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((size++))
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#echo S="$size" $last "[${numbers[@]}]"
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# last
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declare -a res=(0 0 0 0)
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for ((i=1; i<size; ++i)); do
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prev=${numbers[$i-1]}
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cur=${numbers[$i]}
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diff=$((cur-prev))
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((res[diff]++))
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done
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res1="${res[1]}"
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res3="${res[3]}"
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printf "%s : diff1=%d diff2=%d res=%d\n" "$CMD" "$res1" "$res3" $((res1*res3))
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exit 0
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