Given an array of n integers where n > 1, nums
, return an array output
such that output[i]
is equal to the product of all the elements of nums
except nums[i]
.
Solve it without division and in O(n).
For example, given [1,2,3,4]
, return [24,12,8,6]
.
class Solution {
public:
vector<int> productExceptSelf(vector<int>& nums) {
int size = nums.size();
vector<int> res(size, 1);
int cur = 1;
for (int i = 1; i < size; ++i) {
cur *= nums[i - 1];
res[i] *= nums[i];
}
cur = 1;
for (int i = size -1; i >= 0; --i) {
res[i] *= cur;
cur *= nums[i];
}
return res;
}
};