MOLE - Whac-a-Mole
While visiting a traveling fun fair you suddenly have an urge to break the high score in the Whac-a-Mole game. The goal of the Whac-a-Mole game is to... well... whack moles. With a hammer. To make the job easier you have ﬁrst consulted the fortune teller and now you know the exact appearance patterns of the moles. The moles appear out of holes occupying the n2 integer points (x, y) satisfying 0 ≤ x, y <n in a two-dimensional coordinate system. At each time step, some moles will appear and then disappear again before the next time step. After the moles appear but before they disappear, you are able to move your hammer in a straight line to any position (x2 , y2 ) that is at ditance at most d from your current position (x1 , y1 ). For simplicity, we assume that yo can only move your hammer to a point having integer coordinates. A mole is whacke if the center of the hole it appears out of is located on the line between (x1 , y1 ) an (x2 , y2 ) (including the two endpoints). Every mole whacked earns you a point. Whe the game starts, before the ﬁrst time step, you are able to place your hammer anywher you see ﬁt.
The input consists of several test cases. Each test case starts with a line containing three integers n, d and m, where n and d are as described above, and m is the total number of moles that will appear (1 ≤ n ≤ 20, 1 ≤ d ≤ 5, and 1 ≤ m ≤ 1000). Then follow m lines, each containing three integers x, y and t giving the position and time of the appearance of a mole (0 ≤ x, y < n and 1 ≤ t ≤ 10). No two moles will appear at the same place at the same time. The input is ended with a test case where n = d = m = 0. This case should not be processed.
For each test case output a single line containing a single integer, the maximum possible score achievable.
Input: 4 2 6 0 0 1 3 1 3 0 1 2 0 2 2 1 0 2 2 0 2 5 4 3 0 0 1 1 2 1 2 4 1 0 0 0 Output: 4 2
I got WA, help
It doesn't matter because there always exists an optimal solution starting form a integer coordinates. If You aren't hitting anything in the first time step, it is obvious. If You are wacking some moles in that step, all of them form a line. You might as well start on the coordinates of the first hit mole in that sequence.
Does the start position of the hammer(x1,y1) also have to have integer co-ordinates or can it have real co-ordinates?
Remember that positions of the hammer can be outside of the region with holes (coordinates smaller that 0 or not smaller that N)