NVIDIA Software Engineer Systems interview questions

find number of valid subStrings in a given string example in "011001010" valid sub str are 01,1100,10,01,10,01,10 groups of zeros and one are valid ,1010 though has same occurrence of 0,1 invalid as they are bot grouped together.

find if string s is divided by string t, else return integer -1 example: - if string s ="abcdabcdabcdabcd" - string t="abcdabcd" then t can divide s so return length of string u which divides t i.e.., 4 which is length of u="abcd" if s="abdabdabd" and t="abdabd" return -1, since t doesn't divide s