From 961706d93af4daf58d5991deea88981a01f962b0 Mon Sep 17 00:00:00 2001
From: mzuenni <michi.zuendorf@gmail.com>
Date: Fri, 23 Aug 2024 21:36:51 +0200
Subject: more stuff

---
 test/graph/dinic.cpp | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 test/graph/dinic.cpp

(limited to 'test/graph/dinic.cpp')

diff --git a/test/graph/dinic.cpp b/test/graph/dinic.cpp
new file mode 100644
index 0000000..5af7c6f
--- /dev/null
+++ b/test/graph/dinic.cpp
@@ -0,0 +1,62 @@
+#include "../util.h"
+constexpr ll INF = LL::INF;
+namespace dinic {
+#include <graph/dinic.cpp>
+}
+
+namespace pushRelabel {
+#include <graph/pushRelabel.cpp>
+}
+
+void stress_test() {
+	ll queries = 0;
+	for (int tries = 0; tries < 20'000; tries++) {
+		int n = Random::integer<int>(2, 30);
+		int m = Random::integer<int>(n-1, max<int>(n, min<int>(500, n*(n-1) / 2 + 1)));
+
+		dinic::adj.assign(n, {});
+		pushRelabel::adj.assign(n, {});
+
+		Graph<NoData, true> g(n);
+		g.erdosRenyi(m);
+		g.forEdges([](int a, int b){
+			ll w = Random::integer<ll>(1, 1'000'000'000'000ll);
+			dinic::addEdge(a, b, w);
+			pushRelabel::addEdge(a, b, w);
+		});
+
+		ll got = dinic::maxFlow(0, n - 1);
+		ll expected = pushRelabel::maxFlow(0, n - 1);
+		
+		if (got != expected) cerr << "got: " << got << ", expected: " << expected << FAIL;
+		queries += n;
+	}
+	cerr << "tested random queries: " << queries << endl;
+}
+
+constexpr int N = 50000;
+constexpr int M = 200000;
+void performance_test() {
+	using namespace dinic;
+	timer t;
+	Graph<NoData> g(N);
+	g.erdosRenyi(M);
+	adj.assign(N, {});
+	g.forEdges([](int a, int b){
+		ll w1 = Random::integer<ll>(1, 1'000'000'000'000ll);
+		ll w2 = Random::integer<ll>(1, 1'000'000'000'000ll);
+		addEdge(a, b, w1);
+		addEdge(b, a, w2);
+	});
+
+	t.start();
+	hash_t hash = maxFlow(0, N - 1);
+	t.stop();
+	if (t.time > 2000) cerr << "too slow: " << t.time << FAIL;
+	cerr << "tested performance: " << t.time << "ms (hash: " << hash << ")" << endl;
+}
+
+int main() {
+	stress_test();
+	performance_test();
+}
-- 
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