leetcode

0 class Solution {

1 public:

2 int tupleSameProduct(const vector<int> &nums) const {

3 unordered_map<int, int> um;

4 int res = 0;

5 for (int i = 0; i < nums.size(); i++) {

6 for (int j = i + 1; j < nums.size(); j++) {

7 const int prod = nums[i] * nums[j];

8 res += 8 * um[prod]++;

9 }

10 }

11 return res;

12 }

13 };