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#include "../util.h"
#include <graph/reroot.cpp>
void stress_test() {
for (int tries = 0; tries < 50'000; tries++) {
int n = Random::integer<int>(1, 50);
Graph<NoData> g(n);
g.tree();
adj.assign(n, {});
g.forEdges([&](int a, int b){
adj[a].emplace_back(b, Random::integer(0, 10));
adj[b].emplace_back(a, Random::integer(0, 10));
});
Reroot re;
auto ans = re.solve();
auto dfs = [&](auto& self, int u, int p) -> ll {
ll val = 0;
for (auto [v, w] : adj[u]) if (v != p) {
val ^= ((v ^ u) + self(self, v, u)) * w % MOD;
}
return u ^ val;
};
for (int i=0; i<n; i++) {
if (ans[i] != dfs(dfs, i, -1)) {
cerr << "WA expected " << dfs(dfs, i, -1) << " got " << ans[i] << FAIL;
}
}
}
cerr << "tested random 50'000 tests" << endl;
}
constexpr int N = 1'000'000;
void performance_test() {
timer t;
Graph<NoData> g(N);
g.tree();
adj.assign(N, {});
g.forEdges([&](int a, int b){
adj[a].emplace_back(b, Random::integer(0, (int)1e9));
adj[b].emplace_back(a, Random::integer(0, (int)1e9));
});
ll hash = 0;
t.start();
Reroot re;
auto ans = re.solve();
hash = accumulate(begin(ans), end(ans), 0LL);
t.stop();
if (t.time > 1000) 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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