update 252

Author: fishercoder1534

Diff for: src/main/java/com/fishercoder/solutions/_252.java

@@ -1,20 +1,18 @@
 package com.fishercoder.solutions;
 
 import java.util.Arrays;
+import java.util.Comparator;
 
 public class _252 {
     public static class Solution1 {
         public boolean canAttendMeetings(int[][] intervals) {
             if (intervals == null || intervals.length == 0) {
                 return true;
             }
-            Arrays.sort(intervals, (a, b) -> a[0] - b[0]);
-            int end = intervals[0][1];
+            Arrays.sort(intervals, Comparator.comparingInt(a -> a[0]));
             for (int i = 1; i < intervals.length; i++) {
-                if (intervals[i][0] < end) {
+                if (intervals[i][0] < intervals[i - 1][1]) {
                     return false;
-                } else {
-                    end = intervals[i][1];
                 }
             }
             return true;