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#include "../util.h"
constexpr ll INF = LL::INF;
struct edge {
int from, to;
ll cost;
};
#include <graph/bellmannFord.cpp>
namespace floydWarshall {
#include <graph/floydWarshall.cpp>
}
void stress_test() {
ll queries = 0;
for (int tries = 0; tries < 100'000; 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)));
vector<ll> potential = Random::integers<ll>(n, 0, 1'000'000'000'000ll);
vector<edge> edges;
floydWarshall::dist.assign(n, vector<ll>(n, INF));
for (int i = 0; i < n; i++) floydWarshall::dist[i][i] = 0;
Graph<NoData, true> g(n);
g.erdosRenyi(m);
g.forEdges([&](int a, int b){
ll w = Random::integer<ll>(1, 100'000'000'000ll);
w = potential[b] + w - potential[a];
edges.push_back({a, b, w});
floydWarshall::dist[a][b] = min(floydWarshall::dist[a][b], w);
});
vector<vector<ll>> orig = floydWarshall::dist;
floydWarshall::floydWarshall();
for (int i = 0; i < n; i++) {
for (int j = 0; j < 10; j++) {
int k = Random::integer<int>(0, n);
auto path = floydWarshall::getPath(i, k);
if (path.empty() != (floydWarshall::dist[i][k] == INF)) cerr << "error: reconstruction" << FAIL;
if (path.empty()) continue;
if (path.front() != i) cerr << "error: start" << FAIL;
if (path.back() != k) cerr << "error: end" << FAIL;
for (int l = 1; l < ssize(path); l++) {
if (floydWarshall::dist[i][path[l-1]] +
orig[path[l-1]][path[l]] +
floydWarshall::dist[path[l]][k] !=
floydWarshall::dist[i][k]) cerr << "error: edge" << FAIL;
}
}
}
for (int i = 0; i < n; i++) {
auto got = floydWarshall::dist[i];
auto expected = bellmannFord(n, edges, i);
if (got != expected) cerr << "error" << FAIL;
queries += n;
}
}
cerr << "tested random queries: " << queries << endl;
}
constexpr int N = 500;
constexpr int M = 20'000;
void performance_test() {
timer t;
Graph<NoData> g(N);
g.erdosRenyi(M);
floydWarshall::dist.assign(N, vector<ll>(N, INF));
for (int i = 0; i < N; i++) floydWarshall::dist[i][i] = 0;
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);
floydWarshall::dist[a][b] = w1;
floydWarshall::dist[b][a] = w2;
});
t.start();
floydWarshall::floydWarshall();
t.stop();
hash_t hash = 0;
for (auto x : floydWarshall::dist[42]) hash += x;
if (t.time > 500) 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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