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Count source-to-sink paths in a DAG via Kahn's topological sort
plus accumulation:
paths[source] = 1
for u in topological order:
for v in adj[u]: paths[v] += paths[u]
Same 6-node DAG as topo_sort.ml:
0 -> {1, 2} 1 -> {3} 2 -> {3, 4} 3 -> {5} 4 -> {5}
The three witnesses 0 -> 5:
0 -> 1 -> 3 -> 5
0 -> 2 -> 3 -> 5
0 -> 2 -> 4 -> 5
Tests Queue-driven Kahn order + List.rev to recover topological
order, module-level mutable arrays (in_deg, paths), accumulation
in topological traversal.
191 baseline programs total.