Init to zero
Init to zero

lylei/dfs,bluebore/dfs,lylei/dfs,yvxiang/dfs,baidu/bfs,yvxiang/coverage_for_bfs,yvxiang/dfs,bluebore/dfs,yvxiang/dfs,myawan/bfs-1,baidu/bfs,myawan/bfs-1,yvxiang/coverage_for_bfs,yvxiang/coverage_for_bfs,bluebore/bfs,lylei/dfs,myawan/bfs-1,baidu/bfs,bluebore/bfs,yvxiang/dfs,linyvxiang/dfs,00k/ToyDFS,linyvxiang/dfs,linyvxiang/dfs,lylei/dfs,00k/ToyDFS,bluebore/bfs,myawan/bfs-1,yvxiang/coverage_for_bfs,bluebore/dfs,baidu/bfs