#include<bits/stdc++.h>
using namespace std;
int n, k, x, y;
int main() {
scanf("%d %d", &n, &k);
vector<int> c(n + 5), st(k + 5);
vector<vector<int>> v(n + 5, vector<int>()), v2(k + 5, vector<int>()), rev(k + 5, vector<int>());
for (int i = 1; i < n; i++) scanf("%d %d", &x, &y), v[x].emplace_back(y), v[y].emplace_back(x);
for (int i = 1; i <= n; i++) scanf("%d", &c[i]), st[c[i]] = i;
vector<bool> cnt(k + 5);
function<bool(int, int, int)> dfs = [&] (int cur, int par, int col) {
bool add = (c[cur] == col);
for (auto &e: v[cur]) {
if (par == e) continue;
add |= dfs(e, cur, col);
}
if (add) cnt[c[cur]] = 1;
return add;
};
int ans = 1e9;
vector<int> deg(k + 5);
for (int i = 1; i <= k; i++) {
cnt.assign(n + 5, 0);
dfs(st[i], 0, i);
for (int j = 1; j <= k; j++) if (i != j && cnt[j]) v2[i].emplace_back(j), deg[j]++, rev[j].emplace_back(i);
}
stack<int> cst;
int csz = 0;
vector<bool> f(k + 5), f2(k + 5);
function<void(int, int)> dfs2 = [&] (int cur, int par) {
if (f[cur]) return; f[cur] = 1;
for (auto &e: v2[cur]) {
if (par == e) continue;
dfs2(e, cur);
}
cst.emplace(cur);
};
function<void(int, int)> dfs3 = [&] (int cur, int par) {
if (f2[cur]) return; f2[cur] = 1; csz++;
for (auto &e: rev[cur]) {
if (par == e) continue;
dfs3(e, cur);
}
};
for (int i = 1; i <= k; i++) if (!deg[i]) f[i] = f2[i] = 1;
for (int i = 1; i <= k; i++) if (!f[i]) dfs2(i, 0);
while (!cst.empty()) {
int cur = cst.top(); cst.pop();
if (f2[cur]) continue;
dfs3(cur, 0);
ans = min(ans, csz - 1);
}
printf("%d", ans == 1e9 ? 0 : ans);
}
Compilation message
capital_city.cpp: In lambda function:
capital_city.cpp:34:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
34 | if (f[cur]) return; f[cur] = 1;
| ^~
capital_city.cpp:34:29: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
34 | if (f[cur]) return; f[cur] = 1;
| ^
capital_city.cpp: In lambda function:
capital_city.cpp:42:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
42 | if (f2[cur]) return; f2[cur] = 1; csz++;
| ^~
capital_city.cpp:42:30: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
42 | if (f2[cur]) return; f2[cur] = 1; csz++;
| ^~
capital_city.cpp: In function 'int main()':
capital_city.cpp:8:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
8 | scanf("%d %d", &n, &k);
| ~~~~~^~~~~~~~~~~~~~~~~
capital_city.cpp:11:38: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
11 | for (int i = 1; i < n; i++) scanf("%d %d", &x, &y), v[x].emplace_back(y), v[y].emplace_back(x);
| ~~~~~^~~~~~~~~~~~~~~~~
capital_city.cpp:12:39: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
12 | for (int i = 1; i <= n; i++) scanf("%d", &c[i]), st[c[i]] = i;
| ~~~~~^~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
344 KB |
Output is correct |
| 2 |
Correct |
0 ms |
348 KB |
Output is correct |
| 3 |
Correct |
0 ms |
348 KB |
Output is correct |
| 4 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 5 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
344 KB |
Output is correct |
| 2 |
Correct |
0 ms |
348 KB |
Output is correct |
| 3 |
Correct |
0 ms |
348 KB |
Output is correct |
| 4 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 5 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Execution timed out |
3047 ms |
123424 KB |
Time limit exceeded |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
344 KB |
Output is correct |
| 2 |
Correct |
0 ms |
348 KB |
Output is correct |
| 3 |
Correct |
0 ms |
348 KB |
Output is correct |
| 4 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 5 |
Halted |
0 ms |
0 KB |
- |
