[Sort] code style fixed

Author: Yi Gu

Sort/MeetingRooms.swift

@@ -16,13 +16,13 @@
 
 class MeetingRooms {
     func canAttendMeetings(intervals: [Interval]) -> Bool {
-        if intervals.count < 2 {
+        guard intervals.count > 1 else {
             return true
         }
 
         var intervals = intervals.sort({$0.start < $1.start})
 
-        for i in 0...intervals.count - 2 {
+        for i in 0 ..< intervals.count - 1 {
             if intervals[i].end > intervals[i + 1].start {
                 return false
             }

Sort/MergeIntervals.swift

@@ -16,18 +16,24 @@
 
 class MergeIntervals {
     func merge(intervals: [Interval]) -> [Interval] {
-        if intervals.count <= 1 {
+        guard intervals.count > 1 else {
             return intervals
         }
 
-        var intervals = intervals.sort(sortIntervals)
+        var intervals = intervals.sort() {
+            if $0.start != $1.start {
+                return $0.start < $1.start
+            } else {
+                return $0.end < $1.end
+            }
+        }
 
         var res = [Interval]()
         res.append(intervals[0])
 
         for i in 1..<intervals.count {
-            var last = res[res.count - 1]
-            var current = intervals[i]
+            let last = res[res.count - 1]
+            let current = intervals[i]
             if current.start > last.end {
                 res.append(current)
             } else {
@@ -37,12 +43,4 @@ class MergeIntervals {
 
         return res
     }
-    
-    private func sortIntervals(p: Interval, q: Interval) -> Bool {
-        if p.start != q.start {
-            return p.start < q.start
-        } else {
-            return p.end < q.end
-        }
-    }
 }