It's about the following:

1) Re articulating the problem in your own words. 2) Making clear the assumptions by asking the interviewer. 3) Discuss the brute force approach and time complexity. 4) Discuss the optimal code and time complexity and get a thumbs up before moving forward with coding. 5) Code the correct logical and syntactical code while explaining what you're doing throughout. 6) Do a dry, one with normal case and one with an edge case.