// https://www.freecodecamp.org/learn/coding-interview-prep/data-structures/adjacency-matrix

const row = [];
for (let i = 0; i < 5; i++) {
  row.push(0);
}
const adjMatUndirected = [];
for (let i = 0; i < 5; i++) {
  adjMatUndirected.push([...row]);
}
const edges = [
  [1, 4],
  [1, 3],
  [3, 5],
  [4, 5],
];
edges.forEach((e) => {
  adjMatUndirected[e[0] - 1][e[1] - 1] = 1;
  adjMatUndirected[e[1] - 1][e[0] - 1] = 1;
});

console.log(adjMatUndirected);