void parallel_init(graph_t& g, unsigned threadnum, vector<vector<uint64_t> >& global_input_tasks) { global_input_tasks.resize(threadnum); for (uint64_t vid=0;vid<g.vertex_num();vid++) { g.csr_vertex_property(vid).root = vid; global_input_tasks[vertex_distributor(vid, threadnum)].push_back(vid); } }