2016-09-14 AOJ0021 競技プログラミング Parallelism | Aizu Online Judge n = int(input()) for i in range(n): x1, y1, x2, y2, x3, y3, x4, y4 = map(float, input().split()) c1 = (y1 - y2) * (x3 - x4) c2 = (y3 - y4) * (x1 - x2) if abs(c1 - c2) < 1e-10: print('YES') else: print('NO')