public static int findMinimumMeetingRooms(List<Meeting> meetings) {
if(meetings == null || meetings.size() == 0) {
return -1;
}
Collections.sort(meetings, (l, r) -> l.start - r.start);
int rooms = 1;
int count = 1;
int i = 0;
int j = 1;
while(i < j && i < meetings.size() - 1) {
if(j + 1 < meetings.size() && meetings.get(i).end > meetings.get(j).start) {
count++;
j++;
rooms = Math.max(rooms, count);
}
else if(meetings.get(i).end <= meetings.get(j).start){
count = Math.max(1, count - 1);
i++;
if(i == j && j + 1 < meetings.size()) {
j++;
}
}
else {
i++;
}
}
return Math.max(count, rooms);
}
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Course: https://www.educative.io/collection/5668639101419520/5671464854355968
Lesson: https://www.educative.io/collection/page/5668639101419520/5671464854355968/5710239819104256
