Question

这是一个递归计算数字位数的代码。我可以在此代码中添加哪些内容来计算数字中不同数字的数量？或者也许还有其他方式？

 <div id="map"></div>
<script>

  function initMap() {
    var map = new google.maps.Map(document.getElementById('map'), {
     zoom: 13,
      center: {lat:  -20.530637, lng: 46.450046}
    });

    // Create an array of alphabetical characters used to label the markers.
    var labels = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';

    // Add some markers to the map.
    // Note: The code uses the JavaScript Array.prototype.map() method to
    // create an array of markers based on a given "locations" array.
    // The map() method here has nothing to do with the Google Maps API.
    var markers = locations.map(function(location, i) {
      return new google.maps.Marker({
        position: location,
        label: labels[i % labels.length]
      });
    });

    // Add a marker clusterer to manage the markers.
    var markerCluster = new MarkerClusterer(map, markers,
        {imagePath: 'https://developers.google.com/maps/documentation/javascript/examples/markerclusterer/m'});
  }
  var locations = [
      new google.maps.LatLng("-21.530637,46.450046),          
      new google.maps.LatLng("-22.530637,46.450046),

  ]
</script>
<script src="https://developers.google.com/maps/documentation/javascript/examples/markerclusterer/markerclusterer.js">
</script>
<div class="result"></div>

<script type="text/javascript" src="http://code.jquery.com/jquery-latest.min.js"></script>
<script>
    function refresh_div() {
        jQuery.ajax({
            url:'content.php',
            type:'POST',
            success:function(results) {
                locations=results;

                jQuery(".result").html(results);
            }
        });
    }

    t = setInterval(refresh_div,5000);
</script>

Answer 1

使用套装！

static int NumberOfDigits(int a) {
    return new HashSet<char>(Math.Abs(a).ToString()).Count;
}

我们将a变为字符串，然后将字符串转换为一组字符。由于集合不能包含重复值，因此集合的计数是不同数字的数量。

如何计算数字中不同数字的位数？

1 个答案: