#include<bits/stdc++.h>
#define ll long long
#define pii pair<int,int>
using namespace std;
const int mxn=1e5+5;
const int inf=1e9;
vector<int> v;
vector<int> adj[mxn];
int parent[mxn];
int sz[mxn];
int S[mxn];
vector<int> con[mxn];
int findrep(int u) {
return parent[u] == u ? u : parent[u] = findrep(parent[u]);
}
void unite(int u,int v) {
u = findrep(u);
v = findrep(v);
if(u == v) return;
if(sz[u] > sz[v]) swap(u,v);
parent[u] = v;
sz[v] += sz[u];
}
bool dfs(int cur,int prev,int src) {
if(cur == src) return true;
bool f = false;
for(int u : adj[cur]) {
if(u == prev) continue;
f |= dfs(u,cur,src);
}
if(f) v.push_back(cur);
return f;
}
int main() {
int n,k;
cin >> n >> k;
for(int i = 1; i < n; i++) {
int u,v;
cin >> u >> v;
adj[u].push_back(v);
adj[v].push_back(u);
}
for(int i = 1; i <= n; i++) {
cin >> S[i];
con[S[i]].push_back(i);
}
for(int i = 1; i <= k; i++) {
parent[i] = i;
sz[i] = 1;
}
for(int i = 1; i <= k; i++) {
for(int j = 0; j < con[i].size(); j++) {
for(int k = j + 1; k < con[i].size(); k++) {
v.clear();
dfs(con[i][j],-1,con[i][k]);
for(int x : v) {
unite(i,S[x]);
}
}
}
}
int deg[k + 1] = {};
for(int i = 1; i <= n; i++) {
int x = findrep(S[i]);
for(int u : adj[i]) {
if(x == findrep(S[u])) continue;
deg[findrep(S[u])]++;
}
}
int leaf = 0;
for(int i = 1; i <= k; i++) {
if(parent[i] == i && deg[i] == 1) leaf++;
}
cout<<(leaf + 1) / 2<<endl;
}
Compilation message
mergers.cpp: In function 'int main()':
mergers.cpp:61:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
61 | for(int j = 0; j < con[i].size(); j++) {
| ~~^~~~~~~~~~~~~~~
mergers.cpp:62:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
62 | for(int k = j + 1; k < con[i].size(); k++) {
| ~~^~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 2 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 3 |
Correct |
5 ms |
5100 KB |
Output is correct |
| 4 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 5 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 6 |
Correct |
8 ms |
4972 KB |
Output is correct |
| 7 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 8 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 9 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 10 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 11 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 12 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 13 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 14 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 15 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 16 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 17 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 18 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 19 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 20 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 21 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 22 |
Correct |
5 ms |
4992 KB |
Output is correct |
| 23 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 24 |
Correct |
5 ms |
4972 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 2 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 3 |
Correct |
5 ms |
5100 KB |
Output is correct |
| 4 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 5 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 6 |
Correct |
8 ms |
4972 KB |
Output is correct |
| 7 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 8 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 9 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 10 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 11 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 12 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 13 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 14 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 15 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 16 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 17 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 18 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 19 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 20 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 21 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 22 |
Correct |
5 ms |
4992 KB |
Output is correct |
| 23 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 24 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 25 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 26 |
Correct |
33 ms |
5228 KB |
Output is correct |
| 27 |
Execution timed out |
3067 ms |
5228 KB |
Time limit exceeded |
| 28 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 2 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 3 |
Correct |
5 ms |
5100 KB |
Output is correct |
| 4 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 5 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 6 |
Correct |
8 ms |
4972 KB |
Output is correct |
| 7 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 8 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 9 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 10 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 11 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 12 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 13 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 14 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 15 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 16 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 17 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 18 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 19 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 20 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 21 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 22 |
Correct |
5 ms |
4992 KB |
Output is correct |
| 23 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 24 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 25 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 26 |
Execution timed out |
3078 ms |
10980 KB |
Time limit exceeded |
| 27 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Execution timed out |
3054 ms |
10340 KB |
Time limit exceeded |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 2 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 3 |
Correct |
5 ms |
5100 KB |
Output is correct |
| 4 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 5 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 6 |
Correct |
8 ms |
4972 KB |
Output is correct |
| 7 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 8 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 9 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 10 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 11 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 12 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 13 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 14 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 15 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 16 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 17 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 18 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 19 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 20 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 21 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 22 |
Correct |
5 ms |
4992 KB |
Output is correct |
| 23 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 24 |
Correct |
5 ms |
4972 KB |
Output is correct |
| 25 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 26 |
Correct |
33 ms |
5228 KB |
Output is correct |
| 27 |
Execution timed out |
3067 ms |
5228 KB |
Time limit exceeded |
| 28 |
Halted |
0 ms |
0 KB |
- |
