P15483 [CERC2012] Darts

Consider a game in which darts are thrown at a board. The board is formed by $10$ circles with radii $20$, $40$, $60$, $80$, $100$, $120$, $140$, $160$, $180$, and $200$ (measured in millimeters), centered at the origin. Each throw is evaluated depending on where the dart hits the board. The score is $p$ points ($p\in\{1,2,\dots,10\}$) if the smallest circle enclosing or passing through the hit point is the one with radius $20\cdot(11-p)$. No points are awarded for a throw that misses the largest circle. Your task is to compute the total score of a series of $n$ throws.

The first line of the input contains the number of test cases $T$. The descriptions of the test cases follow: Each test case starts with a line containing the number of throws $n$ ($1\le n\le 10^6$). Each of the next $n$ lines contains two integers $x$ and $y$ ($−200\le x,y\le 200$) separated by a space—the coordinates of the point hit by a throw.

Print the answers to the test cases in the order in which they appear in the input. For each test case print a single line containing one integer—the sum of the scores of all $n$ throws.