/**
 * Seven students A, B, C, D, E, F and G are sitting in a row.
 * G is between A and E.
 * F and A have one student between them.
 * E and C have two students between them.
 * D is immediate right of F.
 * C and B have three students between them.
 */

const swap = (array, a, b) => {
  [array[a], array[b]] = [array[b], array[a]]
}

let row = ["A", "B", "C", "D", "E", "F", "G"]

// G is between A and E
swap(row, row.indexOf("A"), row.indexOf("G") + 1)
swap(row, row.indexOf("E"), row.indexOf("G") - 1)

// F and A have one student between them
swap(row, row.indexOf("F"), row.indexOf("A") + 2)

// E and C have two students between them
swap(row, row.indexOf("C"), row.indexOf("A") + 1)

// D is to the immediate right of F
swap(row, row.indexOf("D"), row.indexOf("F") + 1)

row = row.filter(Boolean)

console.log("Who is sitting in the middle? - ", row[Math.floor(row.length / 2)])
console.log("Sequence of the students - ", row.join(" "))