| **Note: The only difference between this chapter and [chapter 2](https://www.facebook.com/codingcompetitions/hacker-cup/2022/round-1/problems/B2) is that here, coordinates are only up to \(\mathbf{3{,}000}\).** | |
| Boss Rob just planted \(N\) happy little trees in his yard, which can be represented on a Cartesian plane. The \(i\)th tree is located at coordinates \(t_i = (A_i, B_i)\). Now, he's looking for the best spot to build a well in order to provide water to them. He considers the *inconvenience* of a potential well location \(p\) to be the sum of the squared Euclidean distances to every tree: | |
| \[\sum_{i=1}^{N} \Vert \,p - t_i \Vert ^ 2 \] | |
| Rob wants to pick a location for his well, well... well. Help him determine the inconvenience for \(Q\) different potential well locations, \((X_1, Y_1), ..., (X_Q, Y_Q)\). To reduce output size, please print the sum of inconveniences for all potential well locations, modulo \(1{,}000{,}000{,}007\). | |
| # Constraints | |
| \(1 \le T \le 55\) | |
| \(1 \le N, Q \le 500{,}000\) | |
| \(0 \le A_i, B_i, X_i, Y_i \le \mathbf{3{,}000}\) | |
| All \((A_i, B_i)\) are distinct within a given test case. | |
| All \((X_i, Y_i)\) are distinct within a given test case. | |
| The total sum of \(N\) and \(Q\) across all test cases is at most \(3{,}000{,}000\). | |
| # Input Format | |
| Input begins with a single integer \(T\), the number of test cases. For each case, there is first a line containing a single integer \(N\). Then, \(N\) lines follow, the \(i\)th of which contains two space-separated integers \(A_i\) and \(B_i\). Then there is a line containing a single integer \(Q\). Then, \(Q\) lines follow, the \(i\)th of which contains two space-separated integers \(X_i\) and \(Y_i\). | |
| # Output Format | |
| For the \(i\)th test case, print a line containing `"Case #i: "`, followed by a single integer, the sum of inconveniences for all \(Q\) well locations, modulo \(1{,}000{,}000{,}007\). | |
| # Sample Explanation | |
| The first two sample cases are depicted below: | |
| {{PHOTO_ID:3159344294326237|WIDTH:700}} | |
| In the first case, the total inconvenience is \(18 + 34 = 52\): | |
| - For the well at \((2, 5)\), the inconvenience is the sum of the squared Euclidean distance to both trees, which is \(3^2 + 3^2 = 18\). | |
| - For the well at \((6, 6)\), the inconvenience is \(32 + 2 = 34\). | |
| In the second case, the total inconvenience is \(47 + 31 + 53 = 131\): | |
| - For the well at \((3, 1)\), the inconvenience is \(4 + 5 + 13 + 25 = 47\). | |
| - For the well at \((5, 2)\), the inconvenience is \(17 + 2 + 2 + 10 = 31\). | |
| - For the well at \((6, 5)\), the inconvenience is \(41 + 8 + 4 + 0 = 53\). | |