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a guest Nov 22nd, 2019 84 Never
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  1. def dfs(v, now):               #now - цвет, в который красим v. равен 1 или 2
  2.     color[v] = now             #собственно, красим v в цвет now
  3.     for to in graph[v]:
  4.         if color[to] == 0:     #если эта вершина еще не покрашена
  5.             dfs(to, 3 - now)   #то запускаем dfs от нее, сменив цвет
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