Day 20 part 1, 1st bash version (with tons of debug output)

day20/ex1.bash

@@ -0,0 +1,105 @@
+#!/bin/bash
+#
+# ex1.bash: Advent2020 game, day 20/game 1.
+
+CMD=${0##*/}
+set -o noglob
+shopt -s extglob
+
+declare -A strings
+declare -a T R B L RT RR RB RL nums
+
+declare -i count=-1
+while read -r line; do
+    case ${line:0:1} in
+        T*)
+            ((count++))
+            num=${line##* }
+            num=${num%%:}
+            nums[$count]="$num"
+            printf "%s\n" "$num"
+            printf "size nums=%s\n" "${#nums[@]}"
+            ;;
+        \#|.)
+            strings[$count]="${strings[$count]} $line"
+            ;;
+    esac
+done
+((count--))
+#printf "string 2311=[%s]\n" "${strings[2311]}"
+
+for key in "${!nums[@]}"; do
+    # shellcheck disable=SC2206
+    str=(${strings[$key]})
+    printf "str=%d\n" "${#str[@]}"
+    top="${str[0]}"
+    bottom="${str[9]}"
+    T+=("$top")
+    B+=("$bottom")
+    # find out right and bottom
+    unset left right
+    for ((i=0; i<10; ++i)); do
+        left+=${str[$i]:0:1}
+        right+=${str[$i]: -1:1}
+    done
+    R+=("$right")
+    L+=("$left")
+    unset fliptop flipbottom flipleft flipright
+    for ((i=9; i>=0; --i)); do
+        fliptop+=${top:$i:1}
+        flipbottom+=${bottom:$i:1}
+        flipleft+=${left:$i:1}
+        flipright+=${right:$i:1}
+    done
+    RT+=("$fliptop")
+    RR+=("$flipright")
+    RB+=("$flipbottom")
+    RL+=("$flipleft")
+
+    printf "%d: top=%s right=%s bottom=%s left=%s\n" "$key" "$top" "$right" "$bottom" "$left"
+    printf "%d: fliptop=%s flipright=%s flipbottom=%s flipleft=%s\n" "$key" "$fliptop" "$flipright" "$flipbottom" "$flipleft"
+
+done
+
+ALL=("${T[@]}" "${R[@]}" "${B[@]}" "${L[@]}" "${RT[@]}" "${RR[@]}" "${RB[@]}" "${RL[@]}")
+#ALL=("${T[@]}" "${R[@]}" "${B[@]}" "${L[@]}" "${RT[@]}" "${RL[@]}")
+printf "%d %s\n" "${#ALL[@]}" "${ALL[0]}"
+declare -i res=1
+for ((i=0; i<${#nums[@]}; ++i)); do
+    count=0
+    #printf "%d: " "$i"
+    #printf "%s " ${T[$i]} ${R[$i]} ${B[$i]} ${L[$i]} ${RT[$i]} ${RR[$i]} ${RB[$i]} ${RL[$i]}
+    #echo
+
+    for ((j=0; j<${#nums[@]}; ++j)); do
+        if ((j != i)); then
+            #printf "i=%d j=%d\n" "$i" "$j"
+            ALL=("${T[$j]}" "${R[$j]}" "${B[$j]}" "${L[$j]}" "${RT[$j]}" \
+                            "${RR[$j]}" "${RB[$j]}" "${RL[$j]}")
+            for s in "${ALL[@]}"; do
+                #[[ $a == "$s" ]] && ((count++))
+                for t in ${T[$i]} ${R[$i]} ${B[$i]} ${L[$i]} #\
+                                  #${RT[$i]} ${RR[$i]} ${RB[$i]} ${RL[$i]}; do
+                    do printf "match %d %s with %d %s: " "$i" "$s" "$j" "$t"
+                    if [[ $t == "$s" ]]; then
+                        printf "yes\n"
+                        ((count++))
+                    else
+                        :
+                        printf "no\n"
+                    fi
+                done
+            done
+
+        fi
+    done
+    printf "COUNT(%d)=%d key=%s\n" "$i" "$count" "${nums[$i]}"
+    if ((count == 2)); then
+        printf " --> %s\n" "${nums[$i]}"
+        ((res*=${nums[$i]}))
+    fi
+done
+
+printf "%s : res=%d\n" "$CMD" "$res"
+
+exit 0