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#include "../util.h"
struct edge {
ll from, to, id;
};
#define Edge edge
#include <graph/articulationPoints.cpp>
#undef Edge
vector<bool> naiveArt() {
vector<bool> res(sz(adj));
vector<int> seen(sz(adj), -1);
for (int i = 0; i < sz(adj); i++) {
if (adj[i].empty()) continue;
seen[i] = i;
vector<ll> todo = {adj[i][0].to};
seen[todo[0]] = i;
while (!todo.empty()) {
int c = todo.back();
todo.pop_back();
for (auto e : adj[c]) {
if (seen[e.to] == i) continue;
seen[e.to] = i;
todo.push_back(e.to);
}
}
for (auto e : adj[i]) {
if (seen[e.to] != i) res[i] = true;
}
}
return res;
}
void stress_test_art() {
ll queries = 0;
for (int tries = 0; tries < 200'000; tries++) {
int n = Random::integer<int>(1, 30);
int m = Random::integer<int>(0, max<int>(1, min<int>(300, n*(n-1) / 2 + 1)));
Graph<NoData, 0, 1> g(n);
g.erdosRenyi(m);
adj.assign(n, {});
int nextId = 0;
g.forEdges([&](int a, int b){
adj[a].push_back({a, b, nextId});
adj[b].push_back({b, a, nextId});
nextId++;
});
auto expected = naiveArt();
find();
vector<bool> got = isArt;
if (got != expected) cerr << "error" << FAIL;
queries += n;
}
cerr << "tested random queries: " << queries << endl;
}
constexpr int N = 500'000;
constexpr int M = 2'000'000;
void performance_test() {
timer t;
Graph<NoData, 0, 1> g(N);
g.erdosRenyi(M);
adj.assign(N, {});
int nextId = 0;
g.forEdges([&](int a, int b){
adj[a].push_back({a, b, nextId});
adj[b].push_back({b, a, nextId});
nextId++;
});
t.start();
find();
t.stop();
hash_t hash = sz(bridges) + sz(bcc);
if (t.time > 500) cerr << "too slow: " << t.time << FAIL;
cerr << "tested performance: " << t.time << "ms (hash: " << hash << ")" << endl;
}
int main() {
stress_test_art();
performance_test();
}
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