// CF template, version 3.0
#include <bits/stdc++.h>
using namespace std;
#define improvePerformance ios_base::sync_with_stdio(false); cin.tie(0)
#define getTest int t; cin >> t
#define eachTest for (int _var=0;_var<t;_var++)
#define get(name) int (name); cin >> (name)
#define out(o) cout << (o)
#define getList(cnt, name) vector<int> (name); for (int _=0;_<(cnt);_++) { get(a); (name).push_back(a); }
#define sortl(name) sort((name).begin(), (name).end())
#define rev(name) reverse((name).begin(), (name).end())
#define forto(name, var) for (int (var) = 0; (var) < (name); (var)++)
#define decision(b) if (b){out("YES");}else{out("NO");}
//#define int long long int
template <typename T, typename I>
struct segtree {
int n;
vector<T> tree;
vector<I> initial;
T id;
segtree(int i_n, vector<I> i_initial, T i_id): n(i_n), initial(i_initial), id(i_id) {
tree.resize(4 * n);
}
T conquer(T left, T right) {
// write your conquer function
}
T value(I inp) {
// write your value function
}
void build(int v, int l, int r) {
if (l == r) tree[v] = value(initial[l]);
else {
int middle = (l + r) / 2;
build(2 * v, l, middle);
build(2 * v + 1, middle + 1, r);
tree[v] = conquer(tree[2 * v], tree[2 * v + 1]);
}
}
void upd(int v, int l, int r, int i, I x) {
if (l == r) tree[v] = value(x);
else {
int middle = (l + r) / 2;
if (middle >= i) upd(2 * v, l, middle, i, x);
else upd(2 * v + 1, middle + 1, r, i, x);
tree[v] = conquer(tree[2 * v], tree[2 * v + 1]);
}
}
T query(int v, int l, int r, int ql, int qr) {
if (ql <= l && r <= qr) return tree[v];
else if (r < ql || qr < l) return id;
int middle = (l + r) / 2;
T left = query(2 * v, l, middle, ql, qr);
T right = query(2 * v + 1, middle + 1, r, ql, qr);
return conquer(left, right);
}
};
// vector<int>
// I'm practising virtual trees. I thought of the hld solution myself but yk I really cba to implement it
// so I read the editorial and I found the cool virtual trees solution. Time to practise it
// ~~and get lost in implementation hell for an hour or ten~~
vector<vector<int>> adjList;
vector<int> parity;
vector<int> height;
vector<int> upto;
vector<int> tin;
vector<int> tout;
vector<vector<int>> lift;
int tot = 0;
int timer = 0;
int root;
void dfs1(int v, int p, int h) {
tin[v] = timer++;
height[v] = h;
lift[v][0] = p == -1? v: p;
forto(18, i) {
if (i == 0) continue;
lift[v][i] = lift[lift[v][i - 1]][i - 1];
}
for (int con: adjList[v]) {
if (con == p) continue;
dfs1(con, v, h + 1);
if (parity[con] == 0) parity[v] = 1 - parity[v];
}
if (adjList[v].size() == 1) parity[v] = 1 - parity[v];
tout[v] = timer;
}
void dfs2(int v, int p, int sum) {
sum += parity[v];
tot += parity[v];
upto[v] = sum;
for (int con: adjList[v]) {
if (con == p) continue;
dfs2(con, v, sum);
}
}
int lca(int u, int v) {
if (height[u] > height[v]) swap(u, v);
int dif = height[v] - height[u];
int p = 1;
forto(18, i) {
if (dif & p) v = lift[v][i];
p *= 2;
}
// now they're the same height
if (u == v) return u; // = v
for (int i = 17; i >= 0; i--) {
int x = lift[u][i];
int y = lift[v][i];
if (x != y) {
u = x;
v = y;
}
}
return lift[u][0];
}
int dfs3(int v, int p, vector<int>& actnodes, vector<vector<int>>& tree) {
int here = 1;
for (int con: tree[v]) {
here += dfs3(con, v, actnodes, tree);
}
if (here % 2) {
int parent = p == -1? root: actnodes[p];
int length = height[actnodes[v]] - height[parent];
int sum = upto[actnodes[v]] - upto[parent];
if (p == -1) {
length++;
sum += parity[root];
}
tot += length - 2 * sum;
}
return here;
}
signed main() {
improvePerformance;
//getTest;
//eachTest {
get(n);
get(q);
adjList.resize(n);
parity.resize(n, 1);
height.resize(n);
upto.resize(n);
tin.resize(n);
tout.resize(n);
lift.resize(n, vector<int>(18));
forto(n - 1, i) {
get(a);
get(b);
a--;
b--;
adjList[a].push_back(b);
adjList[b].push_back(a);
}
forto(n, i) {
if (adjList[i].size() != 1) {
dfs1(i, -1, 1);
dfs2(i, -1, 0);
root = i;
break;
}
}
bool evenleaves = parity[root] == 1;
int original = tot;
forto(q, i) {
get(d);
map<int, int> cnt;
// We need to figure out which nodes get their parity flipped.
int m = n;
forto(d, j) {
get(x);
x--;
cnt[x]++;
m++;
}
bool works = evenleaves;
vector<pair<int, int>> flip;
for (auto it = cnt.begin(); it != cnt.end(); it++) {
int v = it->first;
int c = it->second;
if (adjList[v].size() == 1) c++;
if (c % 2) flip.push_back({tin[v], v}), works = !works;
}
sortl(flip);
set<pair<int, int>> nodes;
for (pair<int, int> node: flip) nodes.insert(node);
int length = flip.size();
forto(length - 1, i) {
int here = lca(flip[i].second, flip[i + 1].second);
nodes.insert({tin[here], here});
}
vector<int> actnodes;
for (auto it = nodes.begin(); it != nodes.end(); it++) actnodes.push_back((*it).second);
int k = actnodes.size();
vector<vector<int>> tree(k);
stack<int> st;
int j = 0;
for (int v: actnodes) {
while (!st.empty()) {
int l = st.top();
int u = actnodes[l];
if (tin[u] < tin[v] && tout[v] <= tout[u]) break;
st.pop();
}
if (!st.empty()) {
int l = st.top();
tree[l].push_back(j);
}
st.push(j);
j++;
}
if (k) dfs3(0, -1, actnodes, tree);
if (works) out(m - 2 + tot);
else out(-1);
out("\n");
tot = original;
}
//}
}
Compilation message
cleaning.cpp: In function 'void dfs1(int, int, int)':
cleaning.cpp:15:35: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
15 | #define forto(name, var) for (int (var) = 0; (var) < (name); (var)++)
| ^
cleaning.cpp:90:5: note: in expansion of macro 'forto'
90 | forto(18, i) {
| ^~~~~
cleaning.cpp: In function 'int lca(int, int)':
cleaning.cpp:15:35: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
15 | #define forto(name, var) for (int (var) = 0; (var) < (name); (var)++)
| ^
cleaning.cpp:117:5: note: in expansion of macro 'forto'
117 | forto(18, i) {
| ^~~~~
cleaning.cpp: In function 'int main()':
cleaning.cpp:10:23: warning: unnecessary parentheses in declaration of 'n' [-Wparentheses]
10 | #define get(name) int (name); cin >> (name)
| ^
cleaning.cpp:157:9: note: in expansion of macro 'get'
157 | get(n);
| ^~~
cleaning.cpp:10:23: warning: unnecessary parentheses in declaration of 'q' [-Wparentheses]
10 | #define get(name) int (name); cin >> (name)
| ^
cleaning.cpp:158:9: note: in expansion of macro 'get'
158 | get(q);
| ^~~
cleaning.cpp:15:35: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
15 | #define forto(name, var) for (int (var) = 0; (var) < (name); (var)++)
| ^
cleaning.cpp:166:9: note: in expansion of macro 'forto'
166 | forto(n - 1, i) {
| ^~~~~
cleaning.cpp:10:23: warning: unnecessary parentheses in declaration of 'a' [-Wparentheses]
10 | #define get(name) int (name); cin >> (name)
| ^
cleaning.cpp:167:13: note: in expansion of macro 'get'
167 | get(a);
| ^~~
cleaning.cpp:10:23: warning: unnecessary parentheses in declaration of 'b' [-Wparentheses]
10 | #define get(name) int (name); cin >> (name)
| ^
cleaning.cpp:168:13: note: in expansion of macro 'get'
168 | get(b);
| ^~~
cleaning.cpp:15:35: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
15 | #define forto(name, var) for (int (var) = 0; (var) < (name); (var)++)
| ^
cleaning.cpp:174:9: note: in expansion of macro 'forto'
174 | forto(n, i) {
| ^~~~~
cleaning.cpp:15:35: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
15 | #define forto(name, var) for (int (var) = 0; (var) < (name); (var)++)
| ^
cleaning.cpp:184:9: note: in expansion of macro 'forto'
184 | forto(q, i) {
| ^~~~~
cleaning.cpp:10:23: warning: unnecessary parentheses in declaration of 'd' [-Wparentheses]
10 | #define get(name) int (name); cin >> (name)
| ^
cleaning.cpp:185:13: note: in expansion of macro 'get'
185 | get(d);
| ^~~
cleaning.cpp:15:35: warning: unnecessary parentheses in declaration of 'j' [-Wparentheses]
15 | #define forto(name, var) for (int (var) = 0; (var) < (name); (var)++)
| ^
cleaning.cpp:189:13: note: in expansion of macro 'forto'
189 | forto(d, j) {
| ^~~~~
cleaning.cpp:10:23: warning: unnecessary parentheses in declaration of 'x' [-Wparentheses]
10 | #define get(name) int (name); cin >> (name)
| ^
cleaning.cpp:190:17: note: in expansion of macro 'get'
190 | get(x);
| ^~~
cleaning.cpp:15:35: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
15 | #define forto(name, var) for (int (var) = 0; (var) < (name); (var)++)
| ^
cleaning.cpp:207:13: note: in expansion of macro 'forto'
207 | forto(length - 1, i) {
| ^~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
348 KB |
Output is correct |
| 2 |
Incorrect |
41 ms |
5204 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
11 ms |
1628 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
13 ms |
2648 KB |
Output is correct |
| 2 |
Correct |
13 ms |
2584 KB |
Output is correct |
| 3 |
Correct |
47 ms |
28524 KB |
Output is correct |
| 4 |
Correct |
85 ms |
33488 KB |
Output is correct |
| 5 |
Correct |
42 ms |
25680 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
32 ms |
5468 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
58 ms |
13324 KB |
Output is correct |
| 2 |
Incorrect |
66 ms |
13632 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
87 ms |
20560 KB |
Output is correct |
| 2 |
Correct |
98 ms |
23632 KB |
Output is correct |
| 3 |
Correct |
102 ms |
23828 KB |
Output is correct |
| 4 |
Correct |
98 ms |
23116 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
348 KB |
Output is correct |
| 2 |
Incorrect |
41 ms |
5204 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
