Initial data commit

Task/Self-describing-numbers/UNIX-Shell/self-describing-numbers.sh

@@ -0,0 +1,20 @@
+selfdescribing() {
+    local n=$1
+    local count=()
+    local i
+    for ((i=0; i<${#n}; i++)); do
+        ((count[${n:i:1}]++))
+    done
+    for ((i=0; i<${#n}; i++)); do
+        (( ${n:i:1} == ${count[i]:-0} )) || return 1
+    done
+    return 0
+}
+
+for n in 0 1 10 11 1210 2020 21200 3211000 42101000; do
+    if selfdescribing $n; then
+        printf "%d\t%s\n" $n yes
+    else
+        printf "%d\t%s\n" $n no
+    fi
+done