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Problem Description 冬天到了，佳佳想去河上滑冰，但是渔民打鱼的时候在河面上开了好多冰洞。假设佳佳开始的位置为(0,0),想要滑行到(N,M)的位置。冰洞的位置已经勘察好了，在(X1,Y1),(X2,Y2),…,(XK,YK)的位置，佳佳技术不好只能绕过冰洞，并且佳佳每次只能沿着x轴或y轴的正方向移动距离1，统计一下佳佳可以有多少条路线。Input 输入的第一行为一个整数T (

DescriptionAs the new term comes, the Ignatius Train Station is very busy nowadays. A lot of student want to get back to school by train(because the trains in the Ignatius Train Station is the fastest

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Description A monster is chasing after Rick and Morty on another planet. They’re so frightened that sometimes they scream. More accurately, Rick screams at times b, b + a, b + 2a, b + 3a, … and Morty