Data commit

Task/Hamming-numbers/UNIX-Shell/hamming-numbers.sh

@@ -0,0 +1,35 @@
+typeset -a hamming=(1) q2 q3 q5
+function nextHamming {
+    typeset -i h=${hamming[${#hamming[@]}-1]}
+    q2+=( $(( h*2 )) )
+    q3+=( $(( h*3 )) )
+    q5+=( $(( h*5 )) )
+    h=$( min3 ${q2[0]} ${q3[0]} ${q5[0]} )
+    (( ${q2[0]} == h )) && ashift q2 >/dev/null
+    (( ${q3[0]} == h )) && ashift q3 >/dev/null
+    (( ${q5[0]} == h )) && ashift q5 >/dev/null
+    hamming+=($h)
+}
+
+function ashift {
+    typeset -n ary=$1
+    printf '%s\n' "${ary[0]}"
+    ary=( "${ary[@]:1}" )
+}
+
+function min3 {
+    if (( $1 < $2 )); then
+        (( $1 < $3 )) && printf '%s\n'$1 || printf '%s\n'$3
+    else
+        (( $2 < $3 )) && printf '%s\n'$2 || printf '%s\n'$3
+    fi
+}
+
+for ((i=1; i<=20; i++)); do
+    nextHamming
+    printf '%d\t%d\n' "$i" "${hamming[i-1]}"
+done
+for ((; i<=1690; i++)); do nextHamming; done
+nextHamming
+printf '%d\t%d\n' "$i" "${hamming[i-1]}"
+printf 'elapsed: %s\n' "$SECONDS"