Uber Interview Question for Software Engineers

Country: United States
Interview Type: In-Person

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Solution to 2/5: The number of minutes in a day is constant. Create an array of size 60*24 minutes in a day. Mark true on meeting schedules.

public boolean meetingOverlap(int[][] meetings) {
        boolean[] schedule = new boolean[24 * 60];
        for(int[] time:meetings) {
            for(int i = time[0]; i <= time[1]; i++) {
                if(schedule[i]) return true;
                schedule[i] = true;
        return false;

- aonecoding July 20, 2017 | Flag Reply
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There is another very neat alternative than creating a large boolean bucket array, radix sort.

// radix_sort is Theta(n)
def radix_sort(meetings){
  // all of these, by definition will have same no digits :: max 4  
  no_digits = size ( meetings[0].start, 10 )
  for ( inx : [no_digits-1:-1] ){
    bucket = mset ( meetings ) as { int ( (str($.start))[inx] ?? 0 ) }
    meetings = fold( [0:10] ,list() ) as { 
      continue( $.o !@ bucket )  
      $.p += bucket[$.o] }
  meetings // return 
def is_overlap(meetings){
  meetings = radix_sort(meetings)
  exists ( [1:size(meetings)] ) where {
    meetings[$.o - 1].end >= meetings[$.o].start   

- NoOne July 21, 2017 | Flag Reply

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