代码挑战：幸福数字 - C#
【摘要】 Write an algorithm to determine if a number is "happy".A happy number is a number defined by the following process: Starting with any positive integer, replace the number by the sum of the squares ...
Write an algorithm to determine if a number is "happy".
A happy number is a number defined by the following process: Starting with any positive integer, replace the number by the sum of the squares of its digits, and repeat the process until the number equals 1 (where it will stay), or it loops endlessly in a cycle which does not include 1. Those numbers for which this process ends in 1 are happy numbers.
Example:
Input: 19
Output: true
Explanation:
12 + 92 = 82
82 + 22 = 68
62 + 82 = 100
12 + 02 + 02 = 1方案：
public class Solution
{
public bool IsHappy(int n)
{
HashSet<int> hs = new HashSet<int>();
while(!hs.Contains(n))
{
hs.Add(n);
int v = 0;
while(n>0)
{
v += (int)Math.Pow(n % 10, 2);
n /= 10;
}
n = v;
}
return n == 1;
}
}
测试案例：
[TestMethod()]
public void Test1()
{
Solution solution = new Solution();
Assert.AreEqual(true, solution.IsHappy(19));
}
[TestMethod()]
public void Test2()
{
Solution solution = new Solution();
Assert.AreEqual(false, solution.IsHappy(4));
}
[TestMethod()]
public void Test3()
{
Solution solution = new Solution();
Assert.AreEqual(false, solution.IsHappy(123));
}
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