#include <bits/stdc++.h>
#pragma GCC optimize("O3,unroll-loops")
using namespace std;
typedef int ll;
typedef vector<ll> v;
typedef vector<v> vv;
typedef vector<vv> vvv;
typedef vector<bool> vb;
typedef vector<vb> vvb;
typedef vector<vvb> vvvb;
typedef pair<ll,ll> p;
typedef vector<p> vp;
typedef vector<vp> vvp;
typedef vector<vvp> vvvp;
typedef pair<ll, p> tri;
typedef vector<tri> vtri;
typedef vector<vtri> vvtri;
typedef vector<vvtri> vvvtri;
#define f first
#define s second
#define pb push_back
#define eb emplace_back
#define all(v) (v).begin(),(v).end()
const ll INF = 1e18;
const ll mod = 1e9 + 7;
#define set unordered_set
ll getLeafCount(ll i, vv &graph, v &res)
{
if (res[i] != -1) return 0;
res[i] = 0;
if (graph[i].size() == 1)
{
res[i] = 1;
return 1;
}
for (ll x : graph[i]) res[i] += getLeafCount(x, graph, res);
return res[i];
}
void getOddAndEvenParents(ll i, vv &graph, v &oddRes, v &evenRes, ll oddParents, ll evenParents, v &parity)
{
if (oddRes[i] != -1) return;
if (parity[i] % 2 == 0) evenParents++;
else oddParents++;
oddRes[i] = oddParents;
evenRes[i] = evenParents;
for (ll x : graph[i]) getOddAndEvenParents(x, graph, oddRes, evenRes, oddParents, evenParents, parity);
}
set<ll> *solve(ll i, vv &graph, vb &visited, v &res, vv &changes, v &oddParents, v &evenParents)
{
visited[i] = true;
vector<set<ll>*> childrenSets;
for (ll x : graph[i])
{
if (visited[x]) continue;
childrenSets.pb(solve(x, graph, visited, res, changes, oddParents, evenParents));
}
childrenSets.pb(new set<ll>());
for (ll x : changes[i])
{
(*childrenSets.back()).insert(x);
res[x] += oddParents[i] - evenParents[i];
}
set<ll> *baseSet = new set<ll>();
ll maxiSize = -1;
ll index = -1;
for (ll i = 0; i < childrenSets.size(); i++)
{
if ((*childrenSets[i]).size() > maxiSize)
{
baseSet = childrenSets[i];
maxiSize = (*childrenSets[i]).size();
index = i;
}
}
set<ll> newAdditions;
for (ll j = 0; j < childrenSets.size(); j++)
{
if (j == index) continue;
for (auto y : (*childrenSets[j]))
{
if ((*baseSet).count(y) > 0)
{
res[y] -= oddParents[i] - evenParents[i];
}
else
{
(*baseSet).insert(y);
newAdditions.insert(y);
}
}
}
for (ll x : newAdditions) (*baseSet).erase(x);
set<ll> done;
for (ll j = 0; j < childrenSets.size(); j++)
{
if (j == index) continue;
for (auto y : *childrenSets[j])
{
if ((*baseSet).count(y) > 0)
{
(*baseSet).erase(y);
done.insert(y);
res[y] += evenParents[i] - oddParents[i];
}
else
{
(*baseSet).insert(y);
if (done.count(y) > 0)
res[y] += oddParents[i] - evenParents[i];
}
}
delete childrenSets[i];
}
return baseSet;
}
int main()
{
ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
ll N, Q;
cin >> N >> Q;
vv graph(N);
for (ll i = 0; i < N - 1; i++)
{
ll a, b;
cin >> a >> b; a--; b--;
graph[a].pb(b);
graph[b].pb(a);
}
ll root = 0;
while (graph[root].size() == 1) root++;
v leafCount(N, -1);
getLeafCount(root, graph, leafCount);
v oddParents(N, -1), evenParents(N, -1);
getOddAndEvenParents(root, graph, oddParents, evenParents, 0, 0, leafCount);
vv queries(Q);
for (ll i = 0; i < Q; i++)
{
ll amt;
cin >> amt;
for (ll j= 0; j < amt; j++)
{
ll par;
cin >> par;
par--;
queries[i].pb(par);
}
}
vv changedInQueries(N);
for (ll i = 0 ;i < Q; i++)
{
map<ll, ll> changed;
for (ll x : queries[i])
{
changed[x]++;
}
for (auto x : changed)
{
if ((x.s % 2 == 1) ^ (graph[x.f].size() == 1)) changedInQueries[x.f].pb(i);
}
}
v addToQuery(Q);
ll base = N - 2;
for (ll i = 0 ;i < N; i++) if (leafCount[i] % 2 == 0) base++;
vb visited(N, false);
solve(root, graph, visited, addToQuery, changedInQueries, oddParents, evenParents);
for (ll i = 0; i < Q; i++)
{
ll count = leafCount[root] + queries[i].size();
set<ll> changed;
for (ll x : queries[i]) if (graph[x].size() == 1) changed.insert(x);
count -= changed.size();
if (count % 2 == 1) cout << "-1\n";
else cout << base + queries[i].size() + addToQuery[i] << "\n";
}
return 0;
}
Compilation message
cleaning.cpp:28:16: warning: overflow in conversion from 'double' to 'll' {aka 'int'} changes value from '1.0e+18' to '2147483647' [-Woverflow]
28 | const ll INF = 1e18;
| ^~~~
cleaning.cpp: In function 'std::unordered_set<int>* solve(ll, vv&, vb&, v&, vv&, v&, v&)':
cleaning.cpp:73:22: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::vector<std::unordered_set<int>*>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
73 | for (ll i = 0; i < childrenSets.size(); i++)
| ~~^~~~~~~~~~~~~~~~~~~~~
cleaning.cpp:75:39: warning: comparison of integer expressions of different signedness: 'std::unordered_set<int>::size_type' {aka 'long unsigned int'} and 'll' {aka 'int'} [-Wsign-compare]
75 | if ((*childrenSets[i]).size() > maxiSize)
| ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
cleaning.cpp:83:22: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::vector<std::unordered_set<int>*>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
83 | for (ll j = 0; j < childrenSets.size(); j++)
| ~~^~~~~~~~~~~~~~~~~~~~~
cleaning.cpp:101:22: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::vector<std::unordered_set<int>*>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
101 | for (ll j = 0; j < childrenSets.size(); j++)
| ~~^~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
1 ms |
348 KB |
Execution killed with signal 11 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
11 ms |
2512 KB |
Execution killed with signal 11 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
15 ms |
6612 KB |
Execution killed with signal 11 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
19 ms |
7520 KB |
Execution killed with signal 11 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
42 ms |
23632 KB |
Execution killed with signal 11 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
55 ms |
35920 KB |
Execution killed with signal 11 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
1 ms |
348 KB |
Execution killed with signal 11 |
| 2 |
Halted |
0 ms |
0 KB |
- |
