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답안 #765861

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
765861 2023-06-25T06:43:35 Z NeroZein 경주 (Race) (IOI11_race) C++17
100 / 100
 2094 ms 139584 KB 
#include "race.h"
#include "bits/stdc++.h"
using namespace std; 

const int MXN = 200005;
const int MXD = 2000006;

int k; 
int sz[MXN];
int dep[MXN]; 
long long dis[MXN];
vector<int> vec[MXN];
map<long long, multiset<int>> haveDis;
vector<pair<int, int>> g[MXN]; 

int ans; 
int Dfs (int v, int p) {
  sz[v] = 1;
  for (auto [u, w] : g[v]) {
    if (u != p) {
      dis[u] = dis[v] + w;
      dep[u] = dep[v] + 1;
      sz[v] += Dfs(u, v); 
    }
  }
  return sz[v];
}

void Dfs2 (int v, int p, bool keep) {
  int big = -1;
  for (auto [u, w] : g[v]) {
    if (u != p && (big == -1 || sz[u] > sz[big])) {
      big = u; 
    }
  }
  for (auto [u, w] : g[v]) {
    if (u != p && u != big) {
      Dfs2(u, v, false); 
    }
  }
  if (big != -1) {
    Dfs2(big, v, true);
    swap(vec[v], vec[big]);  
  }
  vec[v].push_back(v);
  
  for (auto [u, w] : g[v]) {
    if (u == p || u == big) {
      continue; 
    }
    for (int ch : vec[u]) {
      long long needed = k - dis[ch] + 2 * dis[v]; 
      if (needed >= 0 && !haveDis[needed].empty()) {
        ans = min(ans, dep[ch] + *haveDis[needed].begin() - 2 * dep[v]); 
      }
    }
    for (int ch : vec[u]) {
      vec[v].push_back(ch); 
      haveDis[dis[ch]].insert(dep[ch]); 
    }
  }
  long long needed = k + dis[v]; 
  if (needed >= 0 && !haveDis[needed].empty()) {
    ans = min(ans, *haveDis[needed].begin() - dep[v]); 
  }
  if (!keep) {
    for (int u : vec[v]) {
      if (u != v) {
        haveDis[dis[u]].erase(haveDis[dis[u]].find(dep[u]));
      }
    }
  }
  else {
    haveDis[dis[v]].insert(dep[v]); 
  }
}

int best_path(int N, int K, int H[][2], int L[]) {
  k = K; 
  for (int i = 0; i < N - 1; ++i) {
    g[H[i][0]].emplace_back(H[i][1], L[i]); 
    g[H[i][1]].emplace_back(H[i][0], L[i]); 
  }
  ans = N + 1; 
  Dfs(0, 0); 
  Dfs2(0, 0, true); 
  return (ans == N + 1 ? -1 : ans); 
}

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 9684 KB Output is correct
2 Correct 4 ms 9764 KB Output is correct
3 Correct 4 ms 9684 KB Output is correct
4 Correct 4 ms 9696 KB Output is correct
5 Correct 4 ms 9684 KB Output is correct
6 Correct 4 ms 9684 KB Output is correct
7 Correct 4 ms 9684 KB Output is correct
8 Correct 4 ms 9684 KB Output is correct
9 Correct 4 ms 9684 KB Output is correct
10 Correct 4 ms 9684 KB Output is correct
11 Correct 4 ms 9684 KB Output is correct
12 Correct 4 ms 9684 KB Output is correct
13 Correct 4 ms 9684 KB Output is correct
14 Correct 4 ms 9684 KB Output is correct
15 Correct 4 ms 9684 KB Output is correct
16 Correct 4 ms 9684 KB Output is correct
17 Correct 4 ms 9684 KB Output is correct
18 Correct 4 ms 9648 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 9684 KB Output is correct
2 Correct 4 ms 9764 KB Output is correct
3 Correct 4 ms 9684 KB Output is correct
4 Correct 4 ms 9696 KB Output is correct
5 Correct 4 ms 9684 KB Output is correct
6 Correct 4 ms 9684 KB Output is correct
7 Correct 4 ms 9684 KB Output is correct
8 Correct 4 ms 9684 KB Output is correct
9 Correct 4 ms 9684 KB Output is correct
10 Correct 4 ms 9684 KB Output is correct
11 Correct 4 ms 9684 KB Output is correct
12 Correct 4 ms 9684 KB Output is correct
13 Correct 4 ms 9684 KB Output is correct
14 Correct 4 ms 9684 KB Output is correct
15 Correct 4 ms 9684 KB Output is correct
16 Correct 4 ms 9684 KB Output is correct
17 Correct 4 ms 9684 KB Output is correct
18 Correct 4 ms 9648 KB Output is correct
19 Correct 4 ms 9684 KB Output is correct
20 Correct 4 ms 9684 KB Output is correct
21 Correct 5 ms 9940 KB Output is correct
22 Correct 6 ms 10068 KB Output is correct
23 Correct 6 ms 10196 KB Output is correct
24 Correct 6 ms 10236 KB Output is correct
25 Correct 6 ms 10196 KB Output is correct
26 Correct 6 ms 10196 KB Output is correct
27 Correct 5 ms 9812 KB Output is correct
28 Correct 7 ms 10196 KB Output is correct
29 Correct 7 ms 10196 KB Output is correct
30 Correct 7 ms 10188 KB Output is correct
31 Correct 8 ms 10236 KB Output is correct
32 Correct 7 ms 10196 KB Output is correct
33 Correct 6 ms 10200 KB Output is correct
34 Correct 6 ms 10092 KB Output is correct
35 Correct 5 ms 10108 KB Output is correct
36 Correct 5 ms 10068 KB Output is correct
37 Correct 6 ms 10040 KB Output is correct
38 Correct 6 ms 10068 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 9684 KB Output is correct
2 Correct 4 ms 9764 KB Output is correct
3 Correct 4 ms 9684 KB Output is correct
4 Correct 4 ms 9696 KB Output is correct
5 Correct 4 ms 9684 KB Output is correct
6 Correct 4 ms 9684 KB Output is correct
7 Correct 4 ms 9684 KB Output is correct
8 Correct 4 ms 9684 KB Output is correct
9 Correct 4 ms 9684 KB Output is correct
10 Correct 4 ms 9684 KB Output is correct
11 Correct 4 ms 9684 KB Output is correct
12 Correct 4 ms 9684 KB Output is correct
13 Correct 4 ms 9684 KB Output is correct
14 Correct 4 ms 9684 KB Output is correct
15 Correct 4 ms 9684 KB Output is correct
16 Correct 4 ms 9684 KB Output is correct
17 Correct 4 ms 9684 KB Output is correct
18 Correct 4 ms 9648 KB Output is correct
19 Correct 198 ms 24508 KB Output is correct
20 Correct 189 ms 24484 KB Output is correct
21 Correct 196 ms 24600 KB Output is correct
22 Correct 184 ms 24536 KB Output is correct
23 Correct 266 ms 25380 KB Output is correct
24 Correct 176 ms 25648 KB Output is correct
25 Correct 81 ms 30460 KB Output is correct
26 Correct 55 ms 37892 KB Output is correct
27 Correct 201 ms 37336 KB Output is correct
28 Correct 207 ms 103360 KB Output is correct
29 Correct 239 ms 100808 KB Output is correct
30 Correct 190 ms 37348 KB Output is correct
31 Correct 189 ms 37316 KB Output is correct
32 Correct 277 ms 38032 KB Output is correct
33 Correct 306 ms 35236 KB Output is correct
34 Correct 1077 ms 115124 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 9684 KB Output is correct
2 Correct 4 ms 9764 KB Output is correct
3 Correct 4 ms 9684 KB Output is correct
4 Correct 4 ms 9696 KB Output is correct
5 Correct 4 ms 9684 KB Output is correct
6 Correct 4 ms 9684 KB Output is correct
7 Correct 4 ms 9684 KB Output is correct
8 Correct 4 ms 9684 KB Output is correct
9 Correct 4 ms 9684 KB Output is correct
10 Correct 4 ms 9684 KB Output is correct
11 Correct 4 ms 9684 KB Output is correct
12 Correct 4 ms 9684 KB Output is correct
13 Correct 4 ms 9684 KB Output is correct
14 Correct 4 ms 9684 KB Output is correct
15 Correct 4 ms 9684 KB Output is correct
16 Correct 4 ms 9684 KB Output is correct
17 Correct 4 ms 9684 KB Output is correct
18 Correct 4 ms 9648 KB Output is correct
19 Correct 4 ms 9684 KB Output is correct
20 Correct 4 ms 9684 KB Output is correct
21 Correct 5 ms 9940 KB Output is correct
22 Correct 6 ms 10068 KB Output is correct
23 Correct 6 ms 10196 KB Output is correct
24 Correct 6 ms 10236 KB Output is correct
25 Correct 6 ms 10196 KB Output is correct
26 Correct 6 ms 10196 KB Output is correct
27 Correct 5 ms 9812 KB Output is correct
28 Correct 7 ms 10196 KB Output is correct
29 Correct 7 ms 10196 KB Output is correct
30 Correct 7 ms 10188 KB Output is correct
31 Correct 8 ms 10236 KB Output is correct
32 Correct 7 ms 10196 KB Output is correct
33 Correct 6 ms 10200 KB Output is correct
34 Correct 6 ms 10092 KB Output is correct
35 Correct 5 ms 10108 KB Output is correct
36 Correct 5 ms 10068 KB Output is correct
37 Correct 6 ms 10040 KB Output is correct
38 Correct 6 ms 10068 KB Output is correct
39 Correct 198 ms 24508 KB Output is correct
40 Correct 189 ms 24484 KB Output is correct
41 Correct 196 ms 24600 KB Output is correct
42 Correct 184 ms 24536 KB Output is correct
43 Correct 266 ms 25380 KB Output is correct
44 Correct 176 ms 25648 KB Output is correct
45 Correct 81 ms 30460 KB Output is correct
46 Correct 55 ms 37892 KB Output is correct
47 Correct 201 ms 37336 KB Output is correct
48 Correct 207 ms 103360 KB Output is correct
49 Correct 239 ms 100808 KB Output is correct
50 Correct 190 ms 37348 KB Output is correct
51 Correct 189 ms 37316 KB Output is correct
52 Correct 277 ms 38032 KB Output is correct
53 Correct 306 ms 35236 KB Output is correct
54 Correct 1077 ms 115124 KB Output is correct
55 Correct 25 ms 12536 KB Output is correct
56 Correct 17 ms 11220 KB Output is correct
57 Correct 191 ms 26700 KB Output is correct
58 Correct 66 ms 25600 KB Output is correct
59 Correct 93 ms 57668 KB Output is correct
60 Correct 272 ms 104840 KB Output is correct
61 Correct 240 ms 43572 KB Output is correct
62 Correct 221 ms 41012 KB Output is correct
63 Correct 262 ms 41024 KB Output is correct
64 Correct 1480 ms 85052 KB Output is correct
65 Correct 2094 ms 139584 KB Output is correct
66 Correct 250 ms 98736 KB Output is correct
67 Correct 229 ms 42996 KB Output is correct
68 Correct 752 ms 95896 KB Output is correct
69 Correct 786 ms 98408 KB Output is correct
70 Correct 785 ms 93352 KB Output is correct