Advent of Code 2019, day 08

checksum

#!/usr/bin/env awk -f

{
	delete counts
	for (i = 1; i <= NF; i++) counts[$i]++
	if (! min || counts[0] < min) {
		min = counts[0]
		result = counts[1] * counts[2]
	}
}

END { print result }

find-first-meaningful-pixel

#!/usr/bin/env perl -p

s/.*?(0|1).*/\1/

run

#!/bin/bash

W=25
H=6

LAYERS=$(fold -w $((W * H)) | sed 's/\(.\)/\1 /g')

# Part 1
<<< "$LAYERS" ./checksum

# Part 2
<<< "$LAYERS" rs -T | ./find-first-meaningful-pixel | rs $H $W | sed 's/0/ /g'