/**
* @param {number[]} nums
* @return {number[]}
*/
const findDisappearedNumbers = function (nums) {
const numsslen = nums.length, res = [];
for (let i = 0; i < numsslen; ++i) {
const val = Math.abs(nums[i]) - 1;
if (nums[val] > 0) {
nums[val] = -nums[val];
}
}
for (let i = 0; i < numsslen; ++i) {
if (nums[i] > 0) {
res.push(i + 1);
}
}
return res;
};