# 252 Meeting Rooms

Given an array of meeting time intervals consisting of start and end times [[s1,e1],[s2,e2],...] (si < ei),
determine if a person could attend all meetings. For example, Given [[0, 30],[5, 10],[15, 20]], return false.

Implement a Comparator<Interval>

Syntax: don‘t forget the public sign when defining a function

/**
* Definition for an interval.
* public class Interval {
*     int start;
*     int end;
*     Interval() { start = 0; end = 0; }
*     Interval(int s, int e) { start = s; end = e; }
* }
*/
public class Solution {
public boolean canAttendMeetings(Interval[] intervals) {
if (intervals==null || intervals.length==0 || intervals.length==1) return true;
Comparator<Interval> comp = new Comparator<Interval>() {
public int compare(Interval i1, Interval i2) {
return (i1.start==i2.start)? i1.end-i2.end : i1.start-i2.start;
}
};

Arrays.sort(intervals, comp);
Interval pre = intervals[0];
for (int i=1; i<intervals.length; i++) {
Interval cur = intervals[i];
if (cur.start < pre.end) return false;
pre = cur;
}
return true;
}
}

public static <T> void sort(T[] a,
Comparator<? super T> c)

252 Meeting Rooms

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