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1556. Thousand Separator.cs
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1556. Thousand Separator.cs
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/*
Given an integer n, add a dot (".") as the thousands separator and return it in string format.
Example 1:
Input: n = 987
Output: "987"
Example 2:
Input: n = 1234
Output: "1.234"
Example 3:
Input: n = 123456789
Output: "123.456.789"
Example 4:
Input: n = 0
Output: "0"
Constraints:
0 <= n < 2^31
public static string ThousandSeparator(int n)
{
if (n < 1000)
{
return n.ToString();
}
var str = n.ToString();
StringBuilder stringBuilder = new StringBuilder();
var list1 = new List<int>() { 1, 4, 7, 10, 13, 16, 19, 22 };
var list2 = new List<int>() { 2, 5, 8, 11, 14, 17, 20, 23 };
for (int i = 0; i < str.Length; i++)
{
if (i % 3 == 0 && i > 0 && str.Length % 3 == 0)
{
stringBuilder.Append(".");
}
else if (list1.Contains(str.Length) && list1.Contains(i))
{
stringBuilder.Append(".");
}
else if (list2.Contains(str.Length) && list2.Contains(i))
{
stringBuilder.Append(".");
}
stringBuilder.Append(str[i].ToString());
}
return stringBuilder.ToString();
}
*/