code: private void initParams() {
  		nbActives = graph.getNodes().size();
  		for (int i = 0; i < nbNodes; i++) {
  			successors[i] = graph.getSuccOf(i);
  			dfsNumberOfNode[i] = -1;
  			father[i] = -1;
  			A[i] = -1;
  		}
  	}
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