37 lines
734 B
C++
37 lines
734 B
C++
#include <vector>
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/**
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* 1822. Sign of the Product of an Array
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*
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* There is a function signFunc(x) that returns:
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* - 1 if x is positive.
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* - -1 if x is negative.
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* - 0 if x is equal to 0.
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* You are given an integer array nums. Let product be the product of all values in the array nums.
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* Return signFunc(product).
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*/
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class Solution {
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private:
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static constexpr int sgn(int n) {
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return n ? ((n >> 31) | 1) : 0;
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}
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public:
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static int arraySign(const std::vector<int>& nums) {
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const int MASK = 0xFFFFFFFE, n = nums.size();
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int ans = sgn(nums[0]);
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if (!ans)
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return 0;
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for (int i = 1; i < n; ++i) {
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switch (sgn(nums[i])) {
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case 0:
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return 0;
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case -1:
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ans ^= MASK;
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}
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}
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return ans;
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}
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};
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