Roundelay task

// 0 = boys
// 1 = girls

const index = (i, n) => i < 0? (i + n) % n: i % n

const conv = (int, n) => {
  arr = []
  for (let i = 0; i < n; i++) {
    let x = 1 << (n - i - 1) & +int? 1: 0
    arr.push(x)
  }
  return arr
}

const calc = (arr) => {
  let b = 0
  let g = 0
  let nb = 0
  let ng = 0
  let n = arr.length
  for (let i = 0; i < n; i++) {
    let prev, cur, next
    if (i === 0) {
      prev = arr[n - 1]
      cur = arr[i]
      next = arr[i + 1]
    } else if (i === n - 1) {
      prev = arr[i - 1]
      cur = arr[i]
      next = arr[0]
    } else {
      prev = arr[i - 1]
      cur = arr[i]
      next = arr[i + 1]
    }
    if (cur === 0) {
      nb += 1
    } else {
      ng += 1
    }
    if (prev === 0 || next === 0)
      b += 1
    if (prev === 1 || next === 1)
      g += 1
  }
  return {arr, nb, ng, b, g}
}

function check(n) {
  let upper = Math.pow(2, n) - 1
  for (let i = 0; i < upper; i++) {
    let x = calc(conv(i, n))
    if (x.g === 24 && x.b === 20) {
      console.log(JSON.stringify(x.arr))
    }
  }
}

check(30)

/*
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,0,1,1,0,1,1,1,1,1,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,0,1,1,1,0,1,1,1,1,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,0,1,1,1,1,0,1,1,1,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,0,1,1,1,1,1,0,1,1,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,0,1,1,1,1,1,1,0,1,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,0,1,1,1,1,1,1,1,0,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,0,1,1,1,1,1,1,1,1,0,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,0,1,1,1,1,1,1,1,1,1,0,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,0,1,1,1,1,1,1,1,1,1,1,0,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,0,1,1,1,1,1,1,1,1,1,1,1,0,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,0,0,1,1,1,1,1,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,0,1,1,0,1,1,1,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,0,1,1,1,0,1,1,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,0,1,1,1,1,0,1,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,0,1,1,1,1,1,0,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,0,1,1,1,1,1,1,0,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,0,1,1,1,1,1,1,1,0,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,0,1,1,1,1,1,1,1,1,0,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,0,1,1,1,1,1,1,1,1,1,0,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,0,0,1,1,1,1,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,0,1,1,0,1,1,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,0,1,1,1,0,1,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,0,1,1,1,1,0,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,0,1,1,1,1,1,0,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,0,1,1,1,1,1,1,0,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,0,1,1,1,1,1,1,1,0,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,0,1,1,1,1,1,1,1,1,0,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,1,0,0,1,1,1,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,1,0,1,1,0,1,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,1,0,1,1,1,0,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,1,0,1,1,1,1,0,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,1,0,1,1,1,1,1,0,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,1,0,1,1,1,1,1,1,0,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,1,0,1,1,1,1,1,1,1,0,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,1,1,0,0,1,1,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,1,1,0,1,1,0,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,1,1,0,1,1,1,0,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,1,1,0,1,1,1,1,0,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,1,1,0,1,1,1,1,1,0,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,1,1,0,1,1,1,1,1,1,0,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,1,1,1,0,0,1,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,1,1,1,0,1,1,0,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,1,1,1,0,1,1,1,0,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,1,1,1,0,1,1,1,1,0,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,1,1,1,0,1,1,1,1,1,0,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,1,1,1,1,0,0,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,1,1,1,1,0,1,1,0,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,1,1,1,1,0,1,1,1,0,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,1,1,1,1,0,1,1,1,1,0,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,1,1,1,1,1,0,0,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,1,1,1,1,1,0,1,1,0,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,1,1,1,1,1,0,1,1,1,0,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,1,1,1,1,1,1,0,0,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,1,1,1,1,1,1,0,1,1,0,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,1,1,1,1,1,1,1,0,0,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,1,1,1,1,1,1,1,1,0,0,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,0,1,1,0,1,1,1,1,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,0,1,1,1,0,1,1,1,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,0,1,1,1,1,0,1,1,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,0,1,1,1,1,1,0,1,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,0,1,1,1,1,1,1,0,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,0,1,1,1,1,1,1,1,0,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,0,1,1,1,1,1,1,1,1,0,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,0,1,1,1,1,1,1,1,1,1,0,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,0,1,1,1,1,1,1,1,1,1,1,0,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,0,0,1,1,1,1,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,0,1,1,0,1,1,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,0,1,1,1,0,1,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,0,1,1,1,1,0,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,0,1,1,1,1,1,0,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,0,1,1,1,1,1,1,0,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,0,1,1,1,1,1,1,1,0,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,0,1,1,1,1,1,1,1,1,0,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,1,0,0,1,1,1,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,1,0,1,1,0,1,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,1,0,1,1,1,0,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,1,0,1,1,1,1,0,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,1,0,1,1,1,1,1,0,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,1,0,1,1,1,1,1,1,0,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,1,0,1,1,1,1,1,1,1,0,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,1,1,0,0,1,1,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,1,1,0,1,1,0,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,1,1,0,1,1,1,0,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,1,1,0,1,1,1,1,0,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,1,1,0,1,1,1,1,1,0,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,1,1,0,1,1,1,1,1,1,0,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,1,1,1,0,0,1,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,1,1,1,0,1,1,0,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,1,1,1,0,1,1,1,0,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,1,1,1,0,1,1,1,1,0,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,1,1,1,0,1,1,1,1,1,0,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,1,1,1,1,0,0,1,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,1,1,1,1,0,1,1,0,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,1,1,1,1,0,1,1,1,0,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,1,1,1,1,0,1,1,1,1,0,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,1,1,1,1,1,0,0,1,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,1,1,1,1,1,0,1,1,0,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,1,1,1,1,1,0,1,1,1,0,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,1,1,1,1,1,1,0,0,1,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,1,1,1,1,1,1,0,1,1,0,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,1,1,1,1,1,1,1,0,0,1,1,1]
[0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,0,1,1,1,1,1,1,1,1,1,1,0,0,1,1]
*/