Driver code
static void Main ( ) { string str = " geeksforgeeks " ; Console . WriteLine ( " The ▁ input ▁ string ▁ is ▁ " + str ) ; int len = longestUniqueSubsttr ( str ) ; Console . WriteLine ( " The ▁ length ▁ of ▁ the ▁ longest ▁ " + " non - repeating ▁ character ▁ " + " substring ▁ is ▁ " + len ) ; } }