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Trace example
let's trace , , edges: , , . This is a path: ---. BFS from : color[1] = 0. Neighbor : color[2] = 1. Neighbor of : (already , good), (color[3] = 0).
Neighbor of : (already , good), (color[4] = 1). Final: color = [-1, 0, 1, 0, 1]. Output: " " (adding to each). Team : pupils , . Team : pupils , .
