/**
* @param {number[]} nums
* @return {number[]}
*/
var findDisappearedNumbers = function(nums) {
const n = nums.length
for (const num of nums) {
const x = (num - 1) % n
nums[x] += n
}
const ret = []
for (const [i, num] of nums.entries()) {
if (num <= n) {
ret.push(i + 1)
}
}
return ret
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