function solve ([x1, y1, x2, y2]) {
  console.log(`{${x1}, ${y1}} to {0, 0} is ${Number.isInteger(Math.hypot(x1 - 0, y1 - 0)) ? 'valid' : 'invalid'}`)
  console.log(`{${x2}, ${y2}} to {0, 0} is ${Number.isInteger(Math.hypot(x2 - 0, y2 - 0)) ? 'valid' : 'invalid'}`)
  console.log(`{${x1}, ${y1}} to {${x2}, ${y2}} is ${Number.isInteger(Math.hypot(x1 - x2, y1 - y2)) ? 'valid' : 'invalid'}`)
}