Simple algorithm in Golang to sort people into rooms/groups: https://play.golang.org/p/oLZZ01dyI5o

sort_people_into_rooms.go

package main

import (
	"fmt"
	"math"
	"strconv"
	"strings"
)

func main() {
	rooms := 3
	leftAdults, leftChilds := 6, 2
	pplPerRoom := int(math.Ceil(float64(leftAdults+leftChilds) / float64(rooms)))

	var results []string
	for i := 1; i <= rooms; i++ {
		thisRoomA := pplPerRoom
		thisRoomC := 0
		if thisRoomA > leftAdults {
			// 2 adults left, 3 should be in room - try fill in 1 child
			thisRoomC = pplPerRoom - leftAdults
			thisRoomA = thisRoomA - thisRoomC

			if thisRoomC > leftChilds {
				thisRoomC = leftChilds
			}
		}

		leftAdults = leftAdults - thisRoomA
		leftChilds = leftChilds - thisRoomC
		var roomInhabitants []string
		for o := 0; o < thisRoomA; o++ {
			roomInhabitants = append(roomInhabitants, "A")
		}
		for o := 0; o < thisRoomC; o++ {
			roomInhabitants = append(roomInhabitants, "12")
		}
		results = append(results, "room"+strconv.Itoa(i)+"="+strings.Join(roomInhabitants, ","))
	}
	fmt.Println(results)
}