4Sum Algorithm

It is also one of the first civilizations in the universe, along with Ancient Egypt, Norte Chico, Minoan civilization, Ancient China and the Indus Valley. Living along the valleys of the Tigris and Euphrates, Sumerian farmers grew an abundance of grain and other crops, the surplus from which enabled them to form urban settlements. 2900–2800 BC Early Dynastic II period: 2800–2600 BC (Gilgamesh)Uruk IV period: 3300–3100 BC Jemdet Nasr period (Uruk III): 3100–2900 BCUbaid period: 6500–4100 BC (Pottery Neolithic to Chalcolithic)

4Sum source code, pseudocode and analysis