Given a weighted graph $G$ with $V$ vertices and $E$ edges, where all the weights are non-negative, and a source vertex $s$, the single-source shortest path problem consists of finding the distance from $s$ to all other vertices. In this article, I describe the problem in a weighted and unweighted graph, as well as implementations using BFS for unweighted graphs and Dijkstra's algorithm for weighted graphs using an array and a priority queue.