Method dfs

src/graph/undirected/cc.rs:70–79

(&mut self, g: &dyn IGraph, v: usize)

impl CC {
    fn dfs(&mut self, g: &dyn IGraph, v: usize) {
        self.marked[v] = true;
        self.id[v] = self.count;
        self.size[self.count] += 1;
        for &w in g.adj(v) {
            if !self.marked[w] {
                self.dfs(g, w);
            }
        }
    }
}