115 lines
2.3 KiB
Bash
Executable file
115 lines
2.3 KiB
Bash
Executable file
#! /bin/bash
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#set -x
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FILE_IN="${1}"
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safe_count=0
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function debug_echo() {
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echo "$@" 1>&2
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}
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function check_is_safe() {
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local is_up_down="${1}"
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local first_val="${2}"
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local second_val="${3}"
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local fun_is_safe=1
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prev_diff=$((first_val - second_val))
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debug_echo "diff ${prev_diff}"
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if [[ "${prev_diff}" -gt 0 ]]; then
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debug_echo "going up"
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if [[ "${is_up_down}" -le 0 ]]; then
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debug_echo "wrong direction"
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fun_is_safe=0
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fi
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else
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debug_echo "going down"
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if [[ "${is_up_down}" -ge 0 ]]; then
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debug_echo "wrong direction"
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fun_is_safe=0
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fi
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fi
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if [[ "${prev_diff#-}" -le 0 ]] || [[ "${prev_diff#-}" -ge 4 ]]; then
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debug_echo "outside range"
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fun_is_safe=0
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fi
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if [[ "${fun_is_safe}" -ne 0 ]]; then
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debug_echo "safe"
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else
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debug_echo "unsafe"
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fi
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echo "${fun_is_safe}"
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}
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function check_list() {
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local line_split=("$@")
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# start with the first val
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prev_val="${line_split[0]}"
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local is_safe=1
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# if positive, going up, if negative, going down!
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is_up_down="$((line_split[1] - line_split[0]))"
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if [[ "${is_up_down}" -ge 0 ]]; then
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debug_echo "Initially going up"
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else
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debug_echo "Initially going down"
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fi
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for idx in "${!line_split[@]}"; do
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[[ "${idx}" -eq 0 ]] && continue
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debug_echo "index $idx"
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v="${line_split[${idx}]}"
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debug_echo "checking [${v}] against previous [${prev_val}]"
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test_is_safe=$(check_is_safe "${is_up_down}" "${v}" "${prev_val}")
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debug_echo "safe val ${test_is_safe}"
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if [[ "${test_is_safe}" -eq 0 ]]; then
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# normally we fail this set
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is_safe=0
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fi
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# we skip the re-assign once to 'skip' a number
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prev_val=$v
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done
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echo "${is_safe}"
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}
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while read -r l; do
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echo "reading new line [$l]"
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IFS=" "
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read -ra line_split <<< "${l}"
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unset IFS
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is_safe=$(check_list "${line_split[@]}")
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if [[ "${is_safe}" -eq 0 ]]; then
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for idx in "${!line_split[@]}"; do
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# remove each item from the set and try again
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new_line_split=("${line_split[@]:0:${idx}}" "${line_split[@]:$((idx + 1))}")
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echo "${new_line_split[@]}"
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is_retry_safe=$(check_list "${new_line_split[@]}")
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if [[ "${is_retry_safe}" -gt 0 ]]; then
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is_safe=1
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break
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fi
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done
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fi
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safe_count=$((safe_count + is_safe))
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done <"$FILE_IN"
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echo "final safe count ${safe_count}"
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