For each node c in a weighted tree, count unordered pairs of distinct servers (a,b) (neither equal to c) such that the distances from c to a and to b are each divisible by signalSpeed and the paths from c to a and b go into different incident branches (edge-disjoint). The core task is, for every node, to compute distance residues (mod signalSpeed) of nodes in each neighboring subtree and sum cross-subtree products of nodes with residue 0 to get the pair counts.
Use esses exemplos para entender em que contexto ela costuma cair e adaptar sua prática.
Basically a directed graph problem where the you are given nodes and a number of nodes that are down. All downstream nodes are also affected by the outage. You need to count the total number of nodes that are down. You basically just make an adjacency list and then traverse starting from all the down source nodes and traverse, keeping a visited set and returning the length of the visited set.
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