Implement scc

Author: tttanikawa

src/scc.rs

@@ -1 +1,25 @@
+use crate::internal_scc;
+
+pub struct SccGraph {
+    internal: internal_scc::SccGraph,
+}
+
+impl SccGraph {
+    pub fn new(n: usize) -> Self {
+        SccGraph {
+            internal: internal_scc::SccGraph::new(n),
+        }
+    }
+
+    pub fn add_edge(&mut self, from: usize, to: usize) {
+        let n = self.internal.num_vertices();
+        assert!(from < n);
+        assert!(to < n);
+        self.internal.add_edge(from, to);
+    }
+
+    pub fn scc(&self) -> Vec<Vec<usize>> {
+        self.internal.scc()
+    }
+}