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"Simplicity is prerequisite for reliability," by Edsger Dijkstra

Prologue

A graph is an apparent and easy-to-understand data structure. Since Leonard Euler’s era graph theory compelled the minds of humanity to reflect on different tasks, such as how one man can go through all seven bridges of Koenigsberg without going through either of them twice or how a traveling salesman can find the most profitable route.

Source: DZone