7268: ABC274 —— D - Robot Arms 2
[Creator : ]
Description
You are given a sequence $A = (A_1, A_2, \dots, A_N)$ of length N consisting of positive integers, and integers x and y.
Determine whether it is possible to place N+1 points $p_1, p_2, \dots, p_N, p_{N+1}$ in the xy-coordinate plane to satisfy all of the following conditions. (It is allowed to place two or more points at the same coordinates.)
Determine whether it is possible to place N+1 points $p_1, p_2, \dots, p_N, p_{N+1}$ in the xy-coordinate plane to satisfy all of the following conditions. (It is allowed to place two or more points at the same coordinates.)
- $p_1 = (0, 0)$.
- $p_2 = (A_1, 0)$.
- $p_{N+1} = (x, y)$.
- The distance between the points $p_i$ and $p_{i+1}$ is $A_i$. (1≤i≤N)
- The segments $p_i p_{i+1}$ and $p_{i+1} p_{i+2}$ form a 90 degree angle. (1≤i≤N−1)
Input
The input is given from Standard Input in the following format:
$N\ x\ y$
$A_1\ A_2\ \dots\ A_N$
$N\ x\ y$
$A_1\ A_2\ \dots\ A_N$
Output
If it is possible to place $p_1, p_2, \dots, p_N, p_{N+1}$ to satisfy all of the conditions in the Problem Statement, print Yes; otherwise, print No.
Constraints
If it is possible to place $p_1, p_2, \dots, p_N, p_{N+1}$ to satisfy all of the conditions in the Problem Statement, print Yes; otherwise, print No.
Sample 1 Input
3 -1 1
2 1 3
Sample 1 Output
Yes
The figure below shows a placement where $p_1 = (0, 0), p_2 = (2, 0), p_3 = (2, 1)$, and $p_4 = (-1, 1)$. All conditions in the Problem Statement are satisfied.
Sample 2 Input
5 2 0
2 2 2 2 2
Sample 2 Output
Yes
Letting $p_1 = (0, 0), p_2 = (2, 0), p_3 = (2, 2), p_4 = (0, 2), p_5 = (0, 0)$, and $p_6 = (2, 0)$ satisfies all the conditions. Note that multiple points may be placed at the same coordinates.
Sample 3 Input
4 5 5
1 2 3 4
Sample 3 Output
No
3 2 7
2 7 4
No
Sample 4 Input
10 8 -7
6 10 4 1 5 9 8 6 5 1
Sample 4 Output
Yes