Given the following list of objects {user, loginTime, logoutTime}. What is the maximum number of concurrent users logged in at the same time?
Input:
[
{user: A, login: 1, logout: 3},
{user: B, login: 3, logout: 4},
{user: C, login: 1, logout: 2},
{user: D, login: 123123123, logout: 987987987},
{user: E, login: 1, logout: 3}
]
Output:
3