add day 1

src/day_1.sh

@@ -0,0 +1,49 @@
+#!/usr/bin/env bash
+unset PATH
+
+INPUT="$(<data/day_1.txt)"
+
+qsort() {
+  read -ra arr <<< "$@"
+  [[ "${#arr[@]}" == 0 ]] && echo "" && return
+  local smaller=() bigger=() pivot="${arr[0]}" res=()
+
+  for i in "${arr[@]}"; do
+    if [[ "$i" -lt "$pivot" ]]; then
+       smaller+=("$i")
+    elif [[ "$i" -gt "$pivot" ]]; then
+       bigger+=("$i")
+    fi
+  done
+
+  read -ra smaller_sorted <<< "$(qsort "${smaller[@]}")"
+  read -ra bigger_sorted <<< "$(qsort "${bigger[@]}")"
+  res=("${smaller_sorted[@]}" "$pivot" "${bigger_sorted[@]}")
+  echo "${res[@]}"
+}
+
+cals_per_elf() {
+  mapfile -t list <<< "$1"
+  local cals=() tmp=0
+  for i in "${list[@]}"; do
+    [[ "$i" == '' ]] && cals+=("$tmp") && tmp=0 && continue
+    ((tmp+=i))
+  done
+  cals+=("$tmp")
+  qsort "${cals[@]}"
+}
+
+p1() {
+   read -ra cals <<< "$(cals_per_elf "$1")"
+   echo "${cals[@]: -1}"
+}
+p2() {
+   read -ra cals <<< "$(cals_per_elf "$1")"
+   local result=0
+   for i in "${cals[@]: -3}"; do ((result+=i)); done
+   echo "$result"
+}
+
+p1 "$INPUT"
+p2 "$INPUT"
+