From: Brett Parker <iDunno@sommitrealweird.co.uk>
Date: Fri, 4 Dec 2020 18:29:23 +0000 (+0000)
Subject: Add bash variants
X-Git-Url: https://git.sommitrealweird.co.uk/advent-of-code-2020.git/commitdiff_plain/1ae258d79ba91cb6215a62a011fca7936c06d9df?hp=ee13040bdd49fa89d85bcd516fe6f849f868a22e

Add bash variants
---

diff --git a/day2/get_valid_count.sh b/day2/get_valid_count.sh
new file mode 100644
index 0000000..d6ca89e
--- /dev/null
+++ b/day2/get_valid_count.sh
@@ -0,0 +1,44 @@
+#!/bin/bash
+
+check_file() {
+    cat input.txt | while read line; do
+        password=${line#*: }
+        params=${line%: *}
+        min=${params%-*}
+        params=${params#*-}
+        max=${params% *}
+        char=${params#* }
+        count=0
+        for ((i=0; i<${#password}; i++)); do
+            if [ "${password:$i:1}" = "$char" ]; then
+                count=$((count+1))
+            fi
+        done
+        if [ $count -ge $min ] && [ $count -le $max ]; then
+            echo "Got valid line!"
+        fi
+    done
+}
+
+echo "Got $(check_file | wc -l) valid lines"
+
+exit 0
+#!/usr/bin/python3
+
+import regex
+
+total_lines=0
+valid_lines=0
+for line in open("input.txt", "r"):
+    total_lines += 1
+    (min_count, max_count, letter, password) = regex.match('([0-9]+)-([0-9]+) ([a-z]): ([a-z]*)', line).group(1,2,3,4)
+    min_count=int(min_count)
+    max_count=int(max_count)
+    count = 0
+    for x in password:
+        if x == letter:
+            count += 1
+    if count >= min_count and count <= max_count:
+        valid_lines += 1
+
+print(valid_lines, "valid lines of", total_lines)
diff --git a/day2/get_valid_count_2.sh b/day2/get_valid_count_2.sh
new file mode 100644
index 0000000..7226ae4
--- /dev/null
+++ b/day2/get_valid_count_2.sh
@@ -0,0 +1,24 @@
+#!/bin/bash
+
+check_file() {
+    cat input.txt | while read line; do
+        password=${line#*: }
+        params=${line%: *}
+        min=${params%-*}
+        params=${params#*-}
+        max=${params% *}
+        char=${params#* }
+        count=0
+        min=$((min-1))
+        max=$((max-1))
+        if [ "${password:$min:1}" = "$char" ] || [ "${password:$max:1}" = "$char" ]; then
+            if [ "${password:$min:1}" != "${password:$max:1}" ]; then
+                echo "Got valid line! $line"
+            fi
+        fi
+    done
+}
+
+echo "Got $(check_file | wc -l) valid lines"
+
+exit 0
diff --git a/day3/count_trees.sh b/day3/count_trees.sh
new file mode 100644
index 0000000..53925a3
--- /dev/null
+++ b/day3/count_trees.sh
@@ -0,0 +1,51 @@
+#!/bin/bash
+
+start_letter=0
+line_number=0
+tree_count=0
+
+for line in $(<input.txt); do
+    line_number=$((line_number+1))
+    if [ $line_number -eq 1 ]; then
+        continue
+    fi
+    start_letter=$((start_letter+3))
+    if [ $start_letter -ge ${#line} ]; then
+        start_letter=$((start_letter - ${#line}))
+    fi
+    if [ "${line:$start_letter:1}" = "#" ]; then
+        tree_count=$((tree_count+1))
+    fi
+done
+
+echo "Hit $tree_count trees"
+
+exit 0
+
+#!/usr/bin/python3
+
+trees_count = 0
+position = 3 # forth square in, we moved 3 right from where we were, 0 + 3 -> 3
+on_first_line = True
+line_number = 0
+
+for line in open("input.txt", "r"):
+    line_number += 1
+    print("line: ", line_number)
+    line = line.rstrip()
+    print(line)
+    if on_first_line:
+        on_first_line = False
+        continue
+    print(line[position], position)
+    if line[position] == "#":
+        trees_count += 1
+        print("hit tree")
+    else:
+        print("missed tree")
+    # now add 3 to the position
+    position += 3
+    if position >= len(line):
+        position = position - len(line)
+
+print("There were", trees_count, "trees")
diff --git a/day3/count_trees_2.sh b/day3/count_trees_2.sh
new file mode 100644
index 0000000..fde0ec3
--- /dev/null
+++ b/day3/count_trees_2.sh
@@ -0,0 +1,75 @@
+#!/bin/bash
+
+moves=("1,1" "3,1" "5,1" "7,1" "1,2")
+
+count_trees() {
+    right=$1
+    down=$2
+    cur_down=-1 # we want to skip the very first line
+    pos=0
+    tree_count=0
+    for line in $(<input.txt); do
+        cur_down=$((cur_down+1))
+        if [ $cur_down -eq $down ]; then
+            cur_down=0
+            pos=$((pos + $right))
+            if [ $pos -ge ${#line} ]; then
+                pos=$((pos - ${#line}))
+            fi
+            if [ ${line:$pos:1} = "#" ]; then
+                tree_count=$((tree_count+1))
+            fi
+        fi
+    done
+    echo "$tree_count"
+}
+
+mult_total=1
+for move in ${moves[@]}; do
+    down=${move#*,}
+    right=${move%,*}
+    trees=$(count_trees $right $down)
+    echo "Move: $move has $trees trees"
+    mult_total=$((mult_total * $trees))
+done
+
+echo "Answer: $mult_total"
+
+exit 0
+
+#!/usr/bin/python3
+
+trees_count = []
+on_first_line = True
+line_number = 0
+
+move_types = ((1,1), (3,1), (5,1), (7,1), (1,2))
+
+for move in move_types:
+    line_offset = 0
+    tree_count = 0
+    position = move[0]
+    first_line = True
+    for line in open("input.txt", "r"):
+        line = line.rstrip()
+        print(move[1], line_offset)
+        if line_offset < move[1] or first_line:
+            line_offset += 1
+            if line_offset >= move[1]:
+                first_line = False
+            continue
+        line_offset = 1
+        if line[position] == "#":
+            tree_count += 1
+        position += move[0]
+        if position >= len(line):
+            position = position - len(line)
+    trees_count.append(tree_count)
+    tree_count = 0
+
+mult_result = 1
+for x in trees_count:
+    print(x)
+    mult_result *= x
+
+print("There were", mult_result, "trees")
diff --git a/day4/count_valid_passports.sh b/day4/count_valid_passports.sh
new file mode 100644
index 0000000..17c7ffc
--- /dev/null
+++ b/day4/count_valid_passports.sh
@@ -0,0 +1,44 @@
+#!/bin/bash
+
+declare -a data
+cur_data=""
+seperator=""
+valid_count=0
+
+required_fields=(byr iyr eyr hgt hcl ecl pid)
+exec 3<input.txt
+
+while read -u 3 line; do
+    if [ "$line" = "" ]; then
+        data+=("$cur_data")
+        seperator=""
+        cur_data=""
+        continue
+    fi
+    cur_data="${cur_data}${seperator}$line"
+    seperator=" "
+done
+
+# on the last line, if cur_data isn't empty, add that to the array
+if [ "$cur_data" != "" ]; then
+    data+=("$cur_data")
+fi
+
+for (( i=0; i<${#data[@]}; i++ )); do
+    record="${data[$i]}"
+    declare -A kvp
+    for field in $record; do
+        key=${field%:*}
+        value=${field#*:}
+        kvp[$key]=$value
+    done
+    for field in ${required_fields[@]}; do
+        if ! [ ${kvp[$field]+a} ]; then
+            continue 2
+        fi
+    done
+    valid_count=$((valid_count+1))
+    unset kvp
+done
+
+echo "$valid_count valid entries"
diff --git a/day4/count_valid_passports_2.sh b/day4/count_valid_passports_2.sh
new file mode 100644
index 0000000..6eb2b08
--- /dev/null
+++ b/day4/count_valid_passports_2.sh
@@ -0,0 +1,155 @@
+#!/bin/bash
+
+declare -a data
+cur_data=""
+seperator=""
+valid_count=0
+
+required_fields=(byr iyr eyr hgt hcl ecl pid)
+
+check_year() {
+    value=$1
+    min=$2
+    max=$3
+
+    if [ $value -ge $min ] && [ $value -le $max ]; then
+        exit 0
+    fi
+    exit 1
+}
+
+check_height() {
+    value=$1
+    units=${value:$((${#value}-2)):2}
+    value=${value:0:$((${#value}-2))}
+    case $units in
+        in)
+            if [ $value -ge 59 ] && [ $value -le 76 ]; then
+                exit 0
+            fi
+            ;;
+        cm)
+            if [ $value -ge 150 ] && [ $value -le 193 ]; then
+                exit 0
+            fi
+            ;;
+        *)
+            ;;
+    esac
+    exit 1
+}
+
+check_hair() {
+    value=$1
+
+    if [ ${value:0:1} != "#" ]; then
+        exit 1
+    fi
+
+    if [[ $value =~ /^[a-f0-9]{6}$/ ]]; then
+        exit 1
+    fi
+
+    exit 0
+}
+
+check_eyes() {
+    colour="$1"
+    case $colour in
+        amb|blu|brn|gry|grn|hzl|oth)
+            exit 0
+            ;;
+        *)
+            exit 1
+            ;;
+    esac
+    exit 1
+}
+
+check_data() {
+    local -n record=$1
+    for x in ${!record[@]}; do
+        value=${record[$x]}
+        case $x in
+            byr)
+                if ! ( check_year $value 1920 2002 ); then
+                    exit 1
+                fi
+                ;;
+            iyr)
+                if ! ( check_year $value 2010 2020 ); then
+                    exit 1
+                fi
+                ;;
+            eyr)
+                if ! ( check_year $value 2020 2030 ); then
+                    exit 1
+                fi
+                ;;
+            hgt)
+                if ! ( check_height $value ); then
+                    exit 1
+                fi
+                ;;
+            hcl)
+                if ! ( check_hair $value ); then
+                    exit 1
+                fi
+                ;;
+            ecl)
+                if ! ( check_eyes $value ); then
+                    exit 1
+                fi
+                ;;
+            pid)
+                value=${record[$x]}
+                if [ ${#value} -ne 9 ]; then
+                    exit 1
+                fi
+                ;;
+            *)
+                ;;
+        esac
+    done
+
+    exit 0
+}
+
+exec 3<input.txt
+
+while read -u 3 line; do
+    if [ "$line" = "" ]; then
+        data+=("$cur_data")
+        seperator=""
+        cur_data=""
+        continue
+    fi
+    cur_data="${cur_data}${seperator}$line"
+    seperator=" "
+done
+
+# on the last line, if cur_data isn't empty, add that to the array
+if [ "$cur_data" != "" ]; then
+    data+=("$cur_data")
+fi
+
+for (( i=0; i<${#data[@]}; i++ )); do
+    record="${data[$i]}"
+    declare -A kvp
+    for field in $record; do
+        key=${field%:*}
+        value=${field#*:}
+        kvp[$key]=$value
+    done
+    for field in ${required_fields[@]}; do
+        if ! [ ${kvp[$field]+a} ]; then
+            continue 2
+        fi
+    done
+    if ( check_data kvp ); then
+        valid_count=$((valid_count+1))
+    fi
+    unset kvp
+done
+
+echo "$valid_count valid entries"