Codingame temperatures puzzle in BASH: https://www.codingame.com/ide/puzzle/temperatures

codingame-temperatures.sh

# n: the number of temperatures to analyse
read n
closest_to_zero=9999
read temperatures
for t in $temperatures; do
    # t: a temperature expressed as an integer ranging from -273 to 5526
    echo "New temperature: ${t} closest to 0 so far: ${closest_to_zero}" >&2
    # Compare absolute values
    if [[ "${t#-}" -lt "${closest_to_zero#-}" ]]; then
        closest_to_zero=$t
    elif [[ "${t#-}" -eq "${closest_to_zero#-}" ]] && [[ "${t}" -gt "${closest_to_zero}" ]]; then
        # Absolute values are equal, we keep the new value if it is positive
        closest_to_zero=$t
    fi
done

# No temperatures, we default to 0
if [[ $closest_to_zero -eq 9999 ]]; then
    closest_to_zero=0
fi;

echo "${closest_to_zero}"