2015/06/puzzle-2.awk


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#!/usr/bin/awk -f

function setlights(val) {
	for (i = from[1]; i <= to[1]; i++) {
		for (j = from[2]; j <= to[2]; j++) {
			if (!(val == -1 && lights[i][j] == 0))
				lights[i][j] += val
		}
	}
}

$1 == "toggle" { split($2, from, ","); split($4, to, ","); setlights(2) }
$2 ~ /on|off/  { split($3, from, ","); split($5, to, ",")               }
$2 == "on"     { setlights(+1) }
$2 == "off"    { setlights(-1) }
END {
	for (i = 0; i <= 999; i++) {
		for (j = 0; j <= 999; j++)
			count += lights[i][j]
	}
	print count
}