B"Pak Chanek has a directed acyclic graph (a directed graph that does not have any cycles) containing N vertices. Vertex i has S_i edges directed away from that vertex. The j -th edge of vertex i that is directed away from it, is directed towards vertex L_{i,j} and has an integer W_{i,j} ( 0 <= q W_{i,j} <= q1 ). Another information about the graph is that the graph is shaped in such a way such that each vertex can be reached from vertex 1 via zero or more directed edges. Pak Chanek has an array Z that is initially empty. Pak Chanek defines the function dfs as follows: Note that the function does not keep track of which vertices have been visited, so each vertex can be processed more than once. Let's say Pak Chanek does dfs(1) once. After that, Pak Chanek will get an array Z containing some elements 0 or 1 . Define an inversion in array Z as a pair of indices (x, y) ( x < y ) such that Z_x > Z_y . How many different inversions in Z are there if Pak Chanek does dfs(1) once? Since the answer can be very big, output the answer modulo 998 ,244 ,353 . The first line contains a single integer N ( 2 <= q N <= q 10^5 ) -- the number of vertices in the graph. The following lines contain the description of each vertex from vertex 1 to vertex N . The first line of each vertex i contains a single integer S_i ( 0 <= q S_i <= q N-1 ) -- the number of edges directed away from vertex i . The j -th of the next S_i lines of each vertex i contains two integers L_{i,j} and W_{i,j} ( 1 <= q L_{i,j} <= q N ; 0 <= q W_{i,j} <= q 1 ) -- an edge directed away from vertex i that is directed towards vertex L_{i,j} and has an integer W_{i,j} . For each i , the values of L_{i,1} , L_{i,2} , ..., L_{i,S_i} are pairwise distinct. It is guaranteed that the sum of S"...