/**
 * 暴力枚举,无法通过
 */
function threeSum(num) {
 // 从小排序
 num = num.sort((a, b) => a - b)
 const len = num.length
 const result = []
 for (let mid = 1; mid < len - 1; mid++) {
 // 查找左边
 for (let left = 0; left < mid; left++) {
 // 查找右边
 for (let right = mid + 1; right < len; right++) {
 if (num[left] + num[mid] + num[right] === 0) {
 result.push([num[left], num[mid], num[right]])
 }
 }
 }
 }
 return result
}

console.log(threeSum([-2, 0, 1, 1, 2]))