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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;
}
};
[LeetCode] 238 - Product of Array Except Self
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原文地址:http://www.cnblogs.com/shoemaker/p/4766080.html