package alg;

import java.util.Map;
import java.util.concurrent.atomic.AtomicLong;

public class Common {
	public static <K, V> void updateMap(Map<K, AtomicLong> map, K o) {
		// if not in map
		AtomicLong r = map.putIfAbsent(o, new AtomicLong(1));

		// else
		if (r != null)
			map.get(o).incrementAndGet();
	}
}