rename repo, subdir for yearly challenges

2020/day01/ex2-sort.bash

@@ -0,0 +1,28 @@
+#!/bin/bash
+#
+# ex2-sort.bash: Advent2020 game, day 1/game 2, with sort.
+
+CMD=$(basename "$0")
+
+readarray -t numbers <<< "$(sort -n)"
+
+declare -i i j k a b c m1 m2
+for ((i=0; i<${#numbers[@]}; ++i)); do
+	a=$((numbers[i]))
+	for ((j=i+1; j<${#numbers[@]}; ++j)); do
+		b=$((numbers[j]))
+		((a+b > 2020)) && break
+		for ((k=j+1; k<${#numbers[@]}; ++k)); do
+			c=$((numbers[k]))
+			((a+b+c > 2020)) && break
+			if ((a+b+c == 2020)); then
+				printf "${CMD} : %d:%d %d:%d %d:%d sum=%d mul=%d\n" \
+				   $i $a $j $b $k $c \
+				   $((a+b+c)) \
+				   $((a*b*c))
+				break 3
+			fi
+		done
+	done
+done
+exit 0