#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("avx2")
/* In the name of God, aka Allah */
// let this be mytemp.cpp
#include<bits/stdc++.h>
using namespace std;
#define F first
#define S second
#define endl '\n'
#define mk make_pair
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
const int N = 2e5 + 50, LG = 18, M = 4e6 + 50;
int n, k, c[N], h[N], m, id[LG][N], par[LG][N];
bool mark[M];
bool vis[M];
int scc[M], cnt[M];
int r[N];
vector<int> topol;
vector<int> adj[N], adj2[2][M];
int t;
void dfs(int u, int p) {
h[u] = h[p]+1;
par[0][u] = p;
adj2[0][id[0][u]].push_back(c[u]);
adj2[1][c[u]].push_back(id[0][u]);
for (int v:adj[u]) {
if (v == p) continue;
dfs(v, u);
}
}
int LCA(int u, int v) {
if (h[u] > h[v]) swap(u, v);
for (int x = LG-1; x >= 0; x--) {
if ((h[v]-h[u])>>x&1) v = par[x][v];
}
for (int x = LG-1; x >= 0; x--) {
if (par[x][u] != par[x][v]) u = par[x][u], v= par[x][v];
}
if (u == v) return u;
return par[0][u];
}
void add_edge(int u, int v) {
int x = c[u];
for (int t = LG-1; t >= 0; t--) {
if ((h[u]-h[v]+1)>>t&1) {
adj2[0][x].push_back(id[t][u]);
adj2[1][id[t][u]].push_back(x);
u = par[t][u];
}
}
}
void dfs2(int u) {
vis[u] = 1;
for (int v:adj2[1][u]){
if (vis[v]) continue;
dfs2(v);
}
topol.push_back(u);
}
void sfd(int u) {
scc[u] = t;
for (int v:adj2[0][u]) {
if (scc[v]) {
mark[t] = mark[t] || (scc[v] != t);
continue;
}
sfd(v);
}
}
void solve() {
scanf("%d%d", &n, &k);
for (int i = 1; i <= n-1; i++) {
int u, v;
scanf("%d%d", &u, &v);
adj[u].push_back(v), adj[v].push_back(u);
}
for (int u = 1; u <= n; u++) {
scanf("%d", &c[u]);
r[c[u]] = u;
}
m = k;
for (int x = 0; x < LG; x++) {
for (int u = 1; u <= n; u++) {
id[x][u] = ++m;
}
}
dfs(1, 0);
for (int x = 1; x < LG; x++) {
for (int u = 1; u <= n; u++) {
par[x][u] = par[x-1][par[x-1][u]];
if (h[u] < (1<<x)) continue;
adj2[0][id[x][u]].push_back(id[x-1][u]);
adj2[0][id[x][u]].push_back(id[x-1][par[x-1][u]]);
adj2[1][id[x-1][u]].push_back(id[x][u]);
adj2[1][id[x-1][par[x-1][u]]].push_back(id[x][u]);
}
}
for (int u = 1; u <= n; u++) {
r[c[u]] = LCA(r[c[u]], u);
}
for (int u = 1; u <= n; u++) {
add_edge(u, r[c[u]]);
}
for (int u = 1; u <= m; u++) {
if (!vis[u]) dfs2(u);
}
while (topol.size()) {
int u = topol.back();
topol.pop_back();
if (scc[u]) continue;
t++;
sfd(u);
}
for (int x = 1; x <= k; x++) {
cnt[scc[x]]++;
}
int ans = N;
for (int x = 1; x <= t; x++) {
if (mark[x]) continue;
ans = min(ans, cnt[x]);
}
printf("%d", ans-1);
}
int main() {
ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
solve();
return 0;
}
Compilation message
capital_city.cpp: In function 'void solve()':
capital_city.cpp:78:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
78 | scanf("%d%d", &n, &k);
| ~~~~~^~~~~~~~~~~~~~~~
capital_city.cpp:81:22: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
81 | scanf("%d%d", &u, &v);
| ~~~~~^~~~~~~~~~~~~~~~
capital_city.cpp:85:22: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
85 | scanf("%d", &c[u]);
| ~~~~~^~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
103 ms |
193040 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
103 ms |
193040 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Execution timed out |
3086 ms |
494500 KB |
Time limit exceeded |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
103 ms |
193040 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
