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답안 #216828

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
216828 2020-03-28T06:40:54 Z IOrtroiii 수도 (JOI20_capital_city) C++14
11 / 100
 3000 ms 36080 KB 
#include <bits/stdc++.h>

using namespace std;

const int MAXN = 200200;

int N, K;
vector<int> adj[MAXN];
int city[MAXN];
int par[MAXN];
vector<int> towns[MAXN];
int sz[MAXN];
bool delt[MAXN];
vector<int> curComp;
int ans = MAXN;

void dfsSz(int v, int p) {
   sz[v] = 1;
   for (int u : adj[v]) if (u != p && !delt[u]) {
      dfsSz(u, v);
      sz[v] += sz[u];
   }
}

int findCentr(int v, int p, int r) {
   for (int u : adj[v]) if (u != p && !delt[u] && 2 * sz[u] >= sz[r]) {
      return findCentr(u, v, r);
   }
   return v;
}

int dfsPar(int v, int p) {
   par[v] = p;
   curComp.emplace_back(v);
   for (int u : adj[v]) if (u != p && !delt[u]) {
      dfsPar(u, v);
   }
}

int root[MAXN];

int getRoot(int v) {
   if (root[v] != v) {
      root[v] = getRoot(root[v]);
   }
   return root[v];
}

bool merge(int v, int u) {
   v = getRoot(v);
   u = getRoot(u);
   if (v == u) {
      return false;
   } else {
      root[u] = v;
      return true;
   }
}

int cnt[MAXN];

void solve(int v) {
   dfsSz(v, v);
   v = findCentr(v, v, v);
   dfsPar(v, v);
   for (int u : curComp) {
      ++cnt[city[u]];
   }
   bool good = cnt[city[v]] == int(towns[city[v]].size());
   int cans = 0;
   queue<int> q;
   for (int u : towns[city[v]]) {
      q.emplace(u);
   }
   while (!q.empty() && good) {
      int u = q.front(); q.pop();
      if (merge(city[u], city[par[u]])) {
         good &= (cnt[city[par[u]]] == int(towns[city[par[u]]].size()));
         if (!good) break;
         cans++;
         for (int z : towns[city[par[u]]]) {
            q.emplace(z);
         }
      }
   }
   if (good) ans = min(ans, cans);
   for (int z : curComp) {
      root[city[z]] = city[z];
      cnt[city[z]] = 0;
   }
   curComp = {};
   delt[v] = true;
   for (int u : adj[v]) if (!delt[u]) solve(u);
}

int main() {
   ios_base::sync_with_stdio(false); cin.tie(nullptr);
   cin >> N >> K;
   for (int i = 1; i < N; ++i) {
      int v, u;
      cin >> v >> u;
      adj[v].emplace_back(u);
      adj[u].emplace_back(v);
   }
   for (int v = 1; v <= N; ++v) {
      cin >> city[v];
      towns[city[v]].emplace_back(v);
   }
   iota(root + 1, root + K + 1, 1);
   solve(1);
   cout << ans << "\n";
   return 0;
}

Compilation message

capital_city.cpp: In function 'int dfsPar(int, int)':
capital_city.cpp:38:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^

Subtask #1
1.0 / 1.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 9728 KB Output is correct
2 Correct 9 ms 9728 KB Output is correct
3 Correct 9 ms 9728 KB Output is correct
4 Correct 9 ms 9728 KB Output is correct
5 Correct 9 ms 9728 KB Output is correct
6 Correct 10 ms 9728 KB Output is correct
7 Correct 10 ms 9728 KB Output is correct
8 Correct 9 ms 9728 KB Output is correct
9 Correct 10 ms 9728 KB Output is correct
10 Correct 10 ms 9728 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 9728 KB Output is correct
2 Correct 9 ms 9728 KB Output is correct
3 Correct 9 ms 9728 KB Output is correct
4 Correct 9 ms 9728 KB Output is correct
5 Correct 9 ms 9728 KB Output is correct
6 Correct 10 ms 9728 KB Output is correct
7 Correct 10 ms 9728 KB Output is correct
8 Correct 9 ms 9728 KB Output is correct
9 Correct 10 ms 9728 KB Output is correct
10 Correct 10 ms 9728 KB Output is correct
11 Correct 11 ms 9728 KB Output is correct
12 Correct 11 ms 9856 KB Output is correct
13 Correct 12 ms 9856 KB Output is correct
14 Correct 11 ms 9856 KB Output is correct
15 Correct 11 ms 9984 KB Output is correct
16 Correct 11 ms 9856 KB Output is correct
17 Correct 16 ms 9984 KB Output is correct
18 Correct 15 ms 9984 KB Output is correct
19 Correct 15 ms 9984 KB Output is correct
20 Correct 15 ms 9984 KB Output is correct
21 Correct 15 ms 9984 KB Output is correct
22 Correct 11 ms 9984 KB Output is correct
23 Correct 14 ms 9984 KB Output is correct
24 Correct 11 ms 9984 KB Output is correct
25 Correct 13 ms 9984 KB Output is correct
26 Correct 13 ms 9984 KB Output is correct
27 Correct 13 ms 9984 KB Output is correct
28 Correct 12 ms 9984 KB Output is correct
29 Correct 12 ms 9984 KB Output is correct
30 Correct 13 ms 9984 KB Output is correct

Subtask #3
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 641 ms 35568 KB Output is correct
2 Correct 266 ms 35952 KB Output is correct
3 Correct 671 ms 35436 KB Output is correct
4 Correct 276 ms 35952 KB Output is correct
5 Correct 1598 ms 33824 KB Output is correct
6 Correct 311 ms 36080 KB Output is correct
7 Execution timed out 3047 ms 35248 KB Time limit exceeded
8 Halted 0 ms 0 KB -

Subtask #4
0 / 59.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 9728 KB Output is correct
2 Correct 9 ms 9728 KB Output is correct
3 Correct 9 ms 9728 KB Output is correct
4 Correct 9 ms 9728 KB Output is correct
5 Correct 9 ms 9728 KB Output is correct
6 Correct 10 ms 9728 KB Output is correct
7 Correct 10 ms 9728 KB Output is correct
8 Correct 9 ms 9728 KB Output is correct
9 Correct 10 ms 9728 KB Output is correct
10 Correct 10 ms 9728 KB Output is correct
11 Correct 11 ms 9728 KB Output is correct
12 Correct 11 ms 9856 KB Output is correct
13 Correct 12 ms 9856 KB Output is correct
14 Correct 11 ms 9856 KB Output is correct
15 Correct 11 ms 9984 KB Output is correct
16 Correct 11 ms 9856 KB Output is correct
17 Correct 16 ms 9984 KB Output is correct
18 Correct 15 ms 9984 KB Output is correct
19 Correct 15 ms 9984 KB Output is correct
20 Correct 15 ms 9984 KB Output is correct
21 Correct 15 ms 9984 KB Output is correct
22 Correct 11 ms 9984 KB Output is correct
23 Correct 14 ms 9984 KB Output is correct
24 Correct 11 ms 9984 KB Output is correct
25 Correct 13 ms 9984 KB Output is correct
26 Correct 13 ms 9984 KB Output is correct
27 Correct 13 ms 9984 KB Output is correct
28 Correct 12 ms 9984 KB Output is correct
29 Correct 12 ms 9984 KB Output is correct
30 Correct 13 ms 9984 KB Output is correct
31 Correct 641 ms 35568 KB Output is correct
32 Correct 266 ms 35952 KB Output is correct
33 Correct 671 ms 35436 KB Output is correct
34 Correct 276 ms 35952 KB Output is correct
35 Correct 1598 ms 33824 KB Output is correct
36 Correct 311 ms 36080 KB Output is correct
37 Execution timed out 3047 ms 35248 KB Time limit exceeded
38 Halted 0 ms 0 KB -