Answer 1

let nums2 = [1,1];
const nums2String = nums2.toString()

let result = []
let lastArr = []

for (let i=0;i<nums1.length;i++) {
  lastArr = []
  for (let j=i;j<nums1.length;j++) {
    const num = nums1[j]
    lastArr.push(num)
    if (!nums2String.includes(lastArr.toString()) || lastArr.length <= result.length) {
      break
    }
    result = [...lastArr]
  }
}


console.log(result)