leetcode

0 class Solution {

1 public:

2 long long interchangeableRectangles(const vector<vector<int>> &rectangles) const {

3 unordered_map<double, int> um;

4 long long res = 0;

5

6 for (const auto &rec : rectangles) {

7 res += um[(double)rec[0] / rec[1]]++;

8 }

9

10 return res;

11 }

12 };