Data commit

Task/Kosaraju/Sidef/kosaraju.sidef

@@ -0,0 +1,47 @@
+func korasaju(Array g) {
+    # 1. For each vertex u of the graph, mark u as unvisited. Let L be empty.
+    var vis = g.len.of(false)
+    var L   = []
+    var x   = g.end
+    var t   = g.len.of { [] }
+
+    # Recursive
+    func visit(u) {
+        if (!vis[u]) {
+            vis[u] = true
+            g[u].each {|v|
+                visit(v)
+                t[v] << u
+            }
+            L[x--] = u
+        }
+    }
+
+    # 2. For each vertex u of the graph do visit(u)
+    g.range.each {|u|
+        visit(u)
+    }
+
+    var c = []
+
+    # 3. Recursive subroutine:
+    func assign(u, root) {
+        if (vis[u]) {
+            vis[u] = false
+            c[u] = root
+            t[u].each {|v|
+                assign(v, root)
+            }
+        }
+    }
+
+    # 3. For each element u of L in order, do assign(u, u)
+    L.each {|u|
+        assign(u, u)
+    }
+
+    return c
+}
+
+var g = [[1], [2], [0], [1, 2, 4], [3, 5], [2, 6], [5], [4, 6, 7]]
+say korasaju(g)