end用来标记待排序数组的最后一位,start用来标记第一位
const findUnsortedSubarray = function (nums) {
let n = nums.length, min = nums[n - 1], max = nums[0], start=1, end=0;
for (let i = 0; i < n; ++i) {
max = nums[i] > max ? nums[i] : max;
min = nums[n - 1 - i] < min ? nums[n - 1 - i] : min;
if (nums[i] < max) {
end = i;
}
if (nums[n - 1 - i] > min) {
start = n - 1 - i;
}
}
return end - start + 1;
};