get the length of all substrings in csharp

main.cs
string str = "hello";
int n = str.Length;

// Initialize an array to store the lengths of all substrings
int[] substrLen = new int[n*(n+1)/2];
int k = 0;

// Nested loops to generate all possible substrings of the string
for (int i = 0; i < n; i++)
{
    for (int j = i; j < n; j++)
    {
        // Get the substring from i to j
        string sub = str.Substring(i, j - i + 1);

        // Get the length of the substring and store it in the array
        int len = sub.Length;
        substrLen[k++] = len;
    }
}

// Print the lengths of all substrings
for (int i = 0; i < k; i++)
{
    Console.WriteLine(substrLen[i]);
}
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