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답안 #757746

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
757746 2023-06-13T17:32:14 Z taher 경주 (Race) (IOI11_race) C++17
100 / 100
 402 ms 44040 KB 
#include <bits/stdc++.h>

using namespace std;

const int inf = (int) 1e9;
const int N = (int) 2e5 + 1;
const int M = (int) 1e6 + 1;

vector<pair<int, int>> adj[N];
vector<pair<int, int>> tmp;
int Get_Min[M], idx[M];
int sz[N];
bool vis[N];
int ans = inf;
int k;

int Dfs2(int node, int pre, int depth, int tot, int id) {
  if (tot > k) return inf;
  int res = inf;
  if (idx[k - tot] == id) {
    res = min(res, Get_Min[k - tot] + depth);
  }
  tmp.emplace_back(tot, depth);
  for (auto [x, y] : adj[node]) {
    if (x == pre || vis[x]) {
      continue;
    }
    res = min(res, Dfs2(x, node, depth + 1, tot + y, id));
  }
  return res;
}

int best_path(int n, int K, int edges[][2], int w[]) {
  k = K;
  for (int i = 0; i < n - 1; i++) {
    int a = edges[i][0];
    int b = edges[i][1];
    int c = w[i];

    adj[a].emplace_back(b, c);
    adj[b].emplace_back(a, c);
  }
  int cnt = 0;
  for (int i = 0; i <= k; i++) {
    Get_Min[i] =  inf;
    idx[i] = -1;
  }
  function<int(int, int)> Get_Sub_Sizes = [&](int node, int pre) {  
    sz[node] = 1;
    for (auto [x, y] : adj[node]) {
      if (x == pre || vis[x]) {
        continue;
      }
      sz[node] += Get_Sub_Sizes(x, node);
    }
    return sz[node];
  };

  function<int(int, int, int)> Get_Centroid = [&](int node, int pre, int s) {
    for (auto [x, y] : adj[node]) {
      if (x == pre || vis[x]) {
        continue;
      }
      if (sz[x] > s / 2) {
        return Get_Centroid(x, node, s);
      }
    }
    return node;
  };

  function<void(int, int)> Decompose = [&](int node, int pre) {
    Get_Sub_Sizes(node, pre);
    int c = Get_Centroid(node, pre, sz[node]);
    vis[c] = true;
    Get_Min[0] = 0;
    idx[0] = cnt++;
    for (auto [x, y] : adj[c]) {
      if (x == pre || vis[x]) continue;
      tmp.clear();
      ans = min(ans, Dfs2(x, c, 1, y, idx[0]));
      for (int j = 0; j < (int) tmp.size(); j++) {
        if (idx[tmp[j].first] == idx[0]) {
          Get_Min[tmp[j].first] = min(Get_Min[tmp[j].first], tmp[j].second);  
        }
        else {
          Get_Min[tmp[j].first] = tmp[j].second;
          idx[tmp[j].first] = idx[0];
        }
      }
    }
    for (auto [x, y] : adj[c]) {
      if (vis[x]) {
        continue;
      }
      Decompose(x, c);
    }
  };

  Decompose(0, -1);
  if (ans >= inf) {
    return -1;
  } 
  return ans;
}

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5000 KB Output is correct
2 Correct 3 ms 5004 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 3 ms 4948 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 3 ms 5004 KB Output is correct
7 Correct 3 ms 5004 KB Output is correct
8 Correct 3 ms 5000 KB Output is correct
9 Correct 3 ms 5004 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 3 ms 5008 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 3 ms 4948 KB Output is correct
15 Correct 3 ms 5000 KB Output is correct
16 Correct 3 ms 4948 KB Output is correct
17 Correct 3 ms 4948 KB Output is correct
18 Correct 4 ms 4948 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5000 KB Output is correct
2 Correct 3 ms 5004 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 3 ms 4948 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 3 ms 5004 KB Output is correct
7 Correct 3 ms 5004 KB Output is correct
8 Correct 3 ms 5000 KB Output is correct
9 Correct 3 ms 5004 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 3 ms 5008 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 3 ms 4948 KB Output is correct
15 Correct 3 ms 5000 KB Output is correct
16 Correct 3 ms 4948 KB Output is correct
17 Correct 3 ms 4948 KB Output is correct
18 Correct 4 ms 4948 KB Output is correct
19 Correct 3 ms 5000 KB Output is correct
20 Correct 3 ms 5004 KB Output is correct
21 Correct 3 ms 5076 KB Output is correct
22 Correct 7 ms 12244 KB Output is correct
23 Correct 6 ms 10964 KB Output is correct
24 Correct 6 ms 11860 KB Output is correct
25 Correct 7 ms 11656 KB Output is correct
26 Correct 5 ms 7700 KB Output is correct
27 Correct 6 ms 11336 KB Output is correct
28 Correct 5 ms 6548 KB Output is correct
29 Correct 5 ms 7636 KB Output is correct
30 Correct 5 ms 7892 KB Output is correct
31 Correct 6 ms 10196 KB Output is correct
32 Correct 7 ms 10652 KB Output is correct
33 Correct 7 ms 11220 KB Output is correct
34 Correct 6 ms 9668 KB Output is correct
35 Correct 7 ms 11408 KB Output is correct
36 Correct 8 ms 12308 KB Output is correct
37 Correct 6 ms 11348 KB Output is correct
38 Correct 5 ms 9044 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5000 KB Output is correct
2 Correct 3 ms 5004 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 3 ms 4948 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 3 ms 5004 KB Output is correct
7 Correct 3 ms 5004 KB Output is correct
8 Correct 3 ms 5000 KB Output is correct
9 Correct 3 ms 5004 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 3 ms 5008 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 3 ms 4948 KB Output is correct
15 Correct 3 ms 5000 KB Output is correct
16 Correct 3 ms 4948 KB Output is correct
17 Correct 3 ms 4948 KB Output is correct
18 Correct 4 ms 4948 KB Output is correct
19 Correct 112 ms 11816 KB Output is correct
20 Correct 141 ms 11792 KB Output is correct
21 Correct 127 ms 11972 KB Output is correct
22 Correct 110 ms 12220 KB Output is correct
23 Correct 75 ms 11976 KB Output is correct
24 Correct 54 ms 11852 KB Output is correct
25 Correct 104 ms 16140 KB Output is correct
26 Correct 84 ms 21108 KB Output is correct
27 Correct 158 ms 18884 KB Output is correct
28 Correct 272 ms 36284 KB Output is correct
29 Correct 274 ms 35164 KB Output is correct
30 Correct 180 ms 18796 KB Output is correct
31 Correct 167 ms 18800 KB Output is correct
32 Correct 188 ms 19000 KB Output is correct
33 Correct 245 ms 17744 KB Output is correct
34 Correct 196 ms 18596 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5000 KB Output is correct
2 Correct 3 ms 5004 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 3 ms 4948 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 3 ms 5004 KB Output is correct
7 Correct 3 ms 5004 KB Output is correct
8 Correct 3 ms 5000 KB Output is correct
9 Correct 3 ms 5004 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 3 ms 5008 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 3 ms 4948 KB Output is correct
15 Correct 3 ms 5000 KB Output is correct
16 Correct 3 ms 4948 KB Output is correct
17 Correct 3 ms 4948 KB Output is correct
18 Correct 4 ms 4948 KB Output is correct
19 Correct 3 ms 5000 KB Output is correct
20 Correct 3 ms 5004 KB Output is correct
21 Correct 3 ms 5076 KB Output is correct
22 Correct 7 ms 12244 KB Output is correct
23 Correct 6 ms 10964 KB Output is correct
24 Correct 6 ms 11860 KB Output is correct
25 Correct 7 ms 11656 KB Output is correct
26 Correct 5 ms 7700 KB Output is correct
27 Correct 6 ms 11336 KB Output is correct
28 Correct 5 ms 6548 KB Output is correct
29 Correct 5 ms 7636 KB Output is correct
30 Correct 5 ms 7892 KB Output is correct
31 Correct 6 ms 10196 KB Output is correct
32 Correct 7 ms 10652 KB Output is correct
33 Correct 7 ms 11220 KB Output is correct
34 Correct 6 ms 9668 KB Output is correct
35 Correct 7 ms 11408 KB Output is correct
36 Correct 8 ms 12308 KB Output is correct
37 Correct 6 ms 11348 KB Output is correct
38 Correct 5 ms 9044 KB Output is correct
39 Correct 112 ms 11816 KB Output is correct
40 Correct 141 ms 11792 KB Output is correct
41 Correct 127 ms 11972 KB Output is correct
42 Correct 110 ms 12220 KB Output is correct
43 Correct 75 ms 11976 KB Output is correct
44 Correct 54 ms 11852 KB Output is correct
45 Correct 104 ms 16140 KB Output is correct
46 Correct 84 ms 21108 KB Output is correct
47 Correct 158 ms 18884 KB Output is correct
48 Correct 272 ms 36284 KB Output is correct
49 Correct 274 ms 35164 KB Output is correct
50 Correct 180 ms 18796 KB Output is correct
51 Correct 167 ms 18800 KB Output is correct
52 Correct 188 ms 19000 KB Output is correct
53 Correct 245 ms 17744 KB Output is correct
54 Correct 196 ms 18596 KB Output is correct
55 Correct 11 ms 5780 KB Output is correct
56 Correct 11 ms 5796 KB Output is correct
57 Correct 71 ms 12492 KB Output is correct
58 Correct 36 ms 11640 KB Output is correct
59 Correct 99 ms 22480 KB Output is correct
60 Correct 361 ms 44040 KB Output is correct
61 Correct 190 ms 19004 KB Output is correct
62 Correct 208 ms 26832 KB Output is correct
63 Correct 241 ms 26640 KB Output is correct
64 Correct 402 ms 24088 KB Output is correct
65 Correct 244 ms 19660 KB Output is correct
66 Correct 340 ms 39904 KB Output is correct
67 Correct 103 ms 27288 KB Output is correct
68 Correct 222 ms 27428 KB Output is correct
69 Correct 231 ms 27596 KB Output is correct
70 Correct 199 ms 26768 KB Output is correct