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/**
* @param {number[]} nums
* @return {number[]}
*/
var productExceptSelf = function(nums) {
let length = nums.length;
let ret = [1];
let right = 1;
for(let i = 1; i < length; i++){
ret[i] = ret[i-1] * nums[i-1]
}
for(let i = length - 2; i >= 0; i--){
right *= nums[i+1]
ret[i] *= right;
}
return ret;
};