TJayanth

Perfect squares are numbers like 1,4,9,16,25,......

Given two numbers a and b and to find the perfect squares inbetween these two numbers.

private static int PerfectSquares(int startIndex, int endIndex)
{
    int count = (int)Math.Floor(Math.Sqrt(endIndex)) - (int)Math.Ceiling(Math.Sqrt(startIndex)) + 1;
    return count;
}

TJayanth

Check if the given sentene is pangram or not. 

Pangrams are sentences constructed by using every letter of the alphabet at least once
Eg: The quick brown fox jumps over the lazy dog
static bool IsPangram(string s)
{
        return s.ToLower().Where(c => Char.IsLetter(c)).GroupBy(c => c).Count() == 26;
}

TJayanth

Find an element that is not paired. 

Array= {10,5,10,16,17,16,17}
Output: 5

static int lonelyInteger(int[] a) {
        int val=0;
        for(int i=0;i<a.Length;i++){
            val^=a[i];
        }