B'This is the easy version of the problem. The difference between the two versions of this problem is the constraint on k . You can make hacks only if all versions of the problem are solved. You are given an undirected tree of n nodes. Each node v has a value a_v written on it. You have to answer queries related to the tree. You are given q queries. In each query, you are given 5 integers, u_1, v_1, u_2, v_2, k . Denote the count of nodes with value c on path u_1 rightarrow v_1 with x_c , and the count of nodes with value c on path u_2 rightarrow v_2 with y_c . If there are z such values of c such that x_c neq y_c , output any min(z, k) such values in any order. The first line contains one integer n ( 1 <= q n <= q 10^5 ) -- the number of nodes in the tree. The next line contains n integers, a_1, a_2, ldots, a_n ( 1 <= q a_i <= q 10^5 ) -- the value written on each node of the tree. Then n - 1 lines follow. Each line contains two integers u and v ( 1 <= q u, v <= q n, u neq v ) denoting an edge of the tree. It is guaranteed that the given edges form a tree. The next line contains one integer q ( 1 <= q q <= q 10^5 ) -- the number of queries. Then q lines follow. Each line contains five integers u_1, v_1, u_2, v_2, k ( 1 <= q u_1, v_1, u_2, v_2 <= q n , k = 1 ). For each query, output on a separate line. For a query, first output min(z, k) and then on the same line, output any min(z, k) values in any order which occur a different number of times in each path. For query 1 , the first path is 1 rightarrow 2 rightarrow 4 , coming across the multiset of values {5, 2, 4 } . On the second path 4 rightarrow 2 rightarrow 5 , we have the multiset {4, 2, 3 } . Two numbers -- 3 and 5 occur a different number of times, hence we '...