我想在1至100之间随机抽取20个数字,但不应重复。
Updated: If I have 20 names in which any 5 to be selected at random one by one but the name came once not to be called again.....
我想在1至100之间随机抽取20个数字,但不应重复。
Updated: If I have 20 names in which any 5 to be selected at random one by one but the name came once not to be called again.....
我一年前曾问过这个问题。
我认为,所选择的答案是精彩的。
列出名单,从名单上删除:
List<int> numbers = Enumerable.Range(1, 100).ToList();
Random rnd = new Random();
List<int> picks = Enumerable.Range(1, 20).Select(n => {
int index = rnd.Next(numbers.Count);
int pick = numbers[index];
numbers.RemoveAt(index);
return pick;
});
这可能是解决这一问题的最简单方式,但它并非效率最高。 删除清单上的项目涉及移动下列项目。 有了更多的法典,你就可以避免这一举动,但就大多数而言,这部法典是足够的。
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