Data commit

Task/Population-count/UNIX-Shell/population-count.sh

@@ -0,0 +1,33 @@
+popcount() {
+    local -i n=$1
+    (( n < 0 )) && return 1
+    local ones=0
+    while (( n > 0 )); do
+        (( ones += n%2 ))
+        (( n /= 2 ))
+    done
+    echo $ones
+}
+
+popcount_3s=()
+n=1
+for (( i=0; i<30; i++ )); do
+    popcount_3s+=( $(popcount $n) )
+    (( n *= 3 ))
+done
+echo "powers of 3 popcounts: ${popcount_3s[*]}"
+
+evil=()
+odious=()
+n=0
+while (( ${#evil[@]} < 30 || ${#odious[@]} < 30 )); do
+    p=$( popcount $n )
+    if (( $p%2 == 0 )); then
+        evil+=( $n )
+    else
+        odious+=( $n )
+    fi
+    (( n++ ))
+done
+echo "evil nums:   ${evil[*]:0:30}"
+echo "odious nums: ${odious[*]:0:30}"