Implemented hotelbuisness

hotelbusiness/hotels.go

@@ -2,6 +2,8 @@
 
 package hotelbusiness
 
+import "math"
+
 type Guest struct {
 	CheckInDate  int
 	CheckOutDate int
@@ -13,5 +15,30 @@ type Load struct {
 }
 
 func ComputeLoad(guests []Guest) []Load {
-	return []Load{}
+	if len(guests) == 0 {
+		return []Load{}
+	}
+	minDate, maxDate := math.MaxInt, math.MinInt
+	loadsNoEmptyDays := make(map[int]int)
+	for _, guest := range guests {
+		if guest.CheckInDate < minDate {
+			minDate = guest.CheckInDate
+		}
+		if guest.CheckOutDate > maxDate {
+			maxDate = guest.CheckOutDate
+		}
+		for i := guest.CheckInDate; i < guest.CheckOutDate; i++ {
+			loadsNoEmptyDays[i]++
+		}
+	}
+	loads, prevGuestCount := make([]Load, 0), 0
+	for i := minDate; i <= maxDate; i++ {
+		guestCount := loadsNoEmptyDays[i]
+		if prevGuestCount == guestCount {
+			continue
+		}
+		loads = append(loads, Load{i, guestCount})
+		prevGuestCount = guestCount
+	}
+	return loads
 }