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답안 #500618

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
500618 2021-12-31T15:12:30 Z Joo 경주 (Race) (IOI11_race) C++17
100 / 100
 422 ms 89796 KB 
#include "race.h"
#include <bits/stdc++.h>
#define DEBUG 0
using namespace std;
 
const int INF = 1e9, MAXN = 2e5+10;
 
int dep[MAXN], ans = INF;
long long qs[MAXN];
vector<pair<int,int>> G[MAXN];
map<long long, int> mp[MAXN];
 
void dfs1(int u, int p){
  for(auto [v, w] : G[u]){
    if(v == p) continue;
    dep[v] = dep[u]+1;
    qs[v] = qs[u]+w;
    dfs1(v, u);
  }
}
 
void dfs2(int u, int p, long long K){
  for(auto [v, w] : G[u]){
    if(v == p) continue;
    dfs2(v, u, K);
 
    if(mp[v].size() > mp[u].size()){
      swap(mp[v], mp[u]);
    }
  }
 
  for(auto [v, w] : G[u]){
    if(v == p) continue;
    for(auto &[key, val] : mp[v]){
      long long tmp = K-key+2ll*qs[u];
      if(mp[u].find(tmp) != mp[u].end()){
        ans = min(ans, val+mp[u][tmp]-2*dep[u]);
      }
    }
 
    for(auto &[key, val] : mp[v]){
      if(mp[u].find(key) != mp[u].end()){
        mp[u][key] = min(mp[u][key], val);
      } else {
        mp[u][key] = val;
      }
    }
  }
 
  if(mp[u].find(K+qs[u]) != mp[u].end()){
    ans = min(ans, mp[u][K+qs[u]]-dep[u]);
  }
  mp[u][qs[u]] = dep[u];
}
 
int best_path(int N, int K, int H[][2], int L[])
{
  for(int i = 0; i < N-1; i++){
    int u = H[i][0], v = H[i][1];
    G[u].emplace_back(v, L[i]);
    G[v].emplace_back(u, L[i]);
  }
 
  dep[0] = 1;
  dfs1(0, -1);
 
  // for(int i = 0; i < N; i++) cout << dep[i] << " " << qs[i] << "\n";
  
  dfs2(0, -1, K);
 
 
  if(ans >= INF) ans = -1;
  
  return ans;
}
/*
int main(void){
  int N, K; cin >> N >> K;
  int H[N-1][2], L[N-1];
  for(int i = 0; i < N-1; i++) cin >> H[i][0] >> H[i][1] >> L[i];
  int res; cin >> res;
 
  int cal = best_path(N, K, H, L);
 
  cout << cal << " " << res << "\n";
}*/

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 14412 KB Output is correct
2 Correct 7 ms 14320 KB Output is correct
3 Correct 7 ms 14412 KB Output is correct
4 Correct 9 ms 14412 KB Output is correct
5 Correct 7 ms 14440 KB Output is correct
6 Correct 8 ms 14436 KB Output is correct
7 Correct 8 ms 14396 KB Output is correct
8 Correct 10 ms 14412 KB Output is correct
9 Correct 9 ms 14376 KB Output is correct
10 Correct 8 ms 14364 KB Output is correct
11 Correct 7 ms 14412 KB Output is correct
12 Correct 8 ms 14412 KB Output is correct
13 Correct 8 ms 14412 KB Output is correct
14 Correct 9 ms 14432 KB Output is correct
15 Correct 7 ms 14328 KB Output is correct
16 Correct 8 ms 14412 KB Output is correct
17 Correct 7 ms 14412 KB Output is correct
18 Correct 10 ms 14412 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 14412 KB Output is correct
2 Correct 7 ms 14320 KB Output is correct
3 Correct 7 ms 14412 KB Output is correct
4 Correct 9 ms 14412 KB Output is correct
5 Correct 7 ms 14440 KB Output is correct
6 Correct 8 ms 14436 KB Output is correct
7 Correct 8 ms 14396 KB Output is correct
8 Correct 10 ms 14412 KB Output is correct
9 Correct 9 ms 14376 KB Output is correct
10 Correct 8 ms 14364 KB Output is correct
11 Correct 7 ms 14412 KB Output is correct
12 Correct 8 ms 14412 KB Output is correct
13 Correct 8 ms 14412 KB Output is correct
14 Correct 9 ms 14432 KB Output is correct
15 Correct 7 ms 14328 KB Output is correct
16 Correct 8 ms 14412 KB Output is correct
17 Correct 7 ms 14412 KB Output is correct
18 Correct 10 ms 14412 KB Output is correct
19 Correct 9 ms 14412 KB Output is correct
20 Correct 7 ms 14412 KB Output is correct
21 Correct 8 ms 14580 KB Output is correct
22 Correct 8 ms 14652 KB Output is correct
23 Correct 9 ms 14672 KB Output is correct
24 Correct 10 ms 14600 KB Output is correct
25 Correct 8 ms 14624 KB Output is correct
26 Correct 8 ms 14680 KB Output is correct
27 Correct 8 ms 14412 KB Output is correct
28 Correct 8 ms 14668 KB Output is correct
29 Correct 10 ms 14600 KB Output is correct
30 Correct 9 ms 14668 KB Output is correct
31 Correct 8 ms 14652 KB Output is correct
32 Correct 11 ms 14668 KB Output is correct
33 Correct 8 ms 14696 KB Output is correct
34 Correct 8 ms 14596 KB Output is correct
35 Correct 10 ms 14540 KB Output is correct
36 Correct 8 ms 14524 KB Output is correct
37 Correct 7 ms 14540 KB Output is correct
38 Correct 8 ms 14608 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 14412 KB Output is correct
2 Correct 7 ms 14320 KB Output is correct
3 Correct 7 ms 14412 KB Output is correct
4 Correct 9 ms 14412 KB Output is correct
5 Correct 7 ms 14440 KB Output is correct
6 Correct 8 ms 14436 KB Output is correct
7 Correct 8 ms 14396 KB Output is correct
8 Correct 10 ms 14412 KB Output is correct
9 Correct 9 ms 14376 KB Output is correct
10 Correct 8 ms 14364 KB Output is correct
11 Correct 7 ms 14412 KB Output is correct
12 Correct 8 ms 14412 KB Output is correct
13 Correct 8 ms 14412 KB Output is correct
14 Correct 9 ms 14432 KB Output is correct
15 Correct 7 ms 14328 KB Output is correct
16 Correct 8 ms 14412 KB Output is correct
17 Correct 7 ms 14412 KB Output is correct
18 Correct 10 ms 14412 KB Output is correct
19 Correct 118 ms 31360 KB Output is correct
20 Correct 119 ms 31328 KB Output is correct
21 Correct 108 ms 31400 KB Output is correct
22 Correct 112 ms 31584 KB Output is correct
23 Correct 147 ms 44748 KB Output is correct
24 Correct 119 ms 37756 KB Output is correct
25 Correct 84 ms 30364 KB Output is correct
26 Correct 53 ms 38672 KB Output is correct
27 Correct 193 ms 39376 KB Output is correct
28 Correct 226 ms 75212 KB Output is correct
29 Correct 276 ms 73584 KB Output is correct
30 Correct 193 ms 39388 KB Output is correct
31 Correct 188 ms 39500 KB Output is correct
32 Correct 264 ms 39548 KB Output is correct
33 Correct 229 ms 38288 KB Output is correct
34 Correct 305 ms 70212 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 14412 KB Output is correct
2 Correct 7 ms 14320 KB Output is correct
3 Correct 7 ms 14412 KB Output is correct
4 Correct 9 ms 14412 KB Output is correct
5 Correct 7 ms 14440 KB Output is correct
6 Correct 8 ms 14436 KB Output is correct
7 Correct 8 ms 14396 KB Output is correct
8 Correct 10 ms 14412 KB Output is correct
9 Correct 9 ms 14376 KB Output is correct
10 Correct 8 ms 14364 KB Output is correct
11 Correct 7 ms 14412 KB Output is correct
12 Correct 8 ms 14412 KB Output is correct
13 Correct 8 ms 14412 KB Output is correct
14 Correct 9 ms 14432 KB Output is correct
15 Correct 7 ms 14328 KB Output is correct
16 Correct 8 ms 14412 KB Output is correct
17 Correct 7 ms 14412 KB Output is correct
18 Correct 10 ms 14412 KB Output is correct
19 Correct 9 ms 14412 KB Output is correct
20 Correct 7 ms 14412 KB Output is correct
21 Correct 8 ms 14580 KB Output is correct
22 Correct 8 ms 14652 KB Output is correct
23 Correct 9 ms 14672 KB Output is correct
24 Correct 10 ms 14600 KB Output is correct
25 Correct 8 ms 14624 KB Output is correct
26 Correct 8 ms 14680 KB Output is correct
27 Correct 8 ms 14412 KB Output is correct
28 Correct 8 ms 14668 KB Output is correct
29 Correct 10 ms 14600 KB Output is correct
30 Correct 9 ms 14668 KB Output is correct
31 Correct 8 ms 14652 KB Output is correct
32 Correct 11 ms 14668 KB Output is correct
33 Correct 8 ms 14696 KB Output is correct
34 Correct 8 ms 14596 KB Output is correct
35 Correct 10 ms 14540 KB Output is correct
36 Correct 8 ms 14524 KB Output is correct
37 Correct 7 ms 14540 KB Output is correct
38 Correct 8 ms 14608 KB Output is correct
39 Correct 118 ms 31360 KB Output is correct
40 Correct 119 ms 31328 KB Output is correct
41 Correct 108 ms 31400 KB Output is correct
42 Correct 112 ms 31584 KB Output is correct
43 Correct 147 ms 44748 KB Output is correct
44 Correct 119 ms 37756 KB Output is correct
45 Correct 84 ms 30364 KB Output is correct
46 Correct 53 ms 38672 KB Output is correct
47 Correct 193 ms 39376 KB Output is correct
48 Correct 226 ms 75212 KB Output is correct
49 Correct 276 ms 73584 KB Output is correct
50 Correct 193 ms 39388 KB Output is correct
51 Correct 188 ms 39500 KB Output is correct
52 Correct 264 ms 39548 KB Output is correct
53 Correct 229 ms 38288 KB Output is correct
54 Correct 305 ms 70212 KB Output is correct
55 Correct 20 ms 17120 KB Output is correct
56 Correct 14 ms 15820 KB Output is correct
57 Correct 72 ms 29932 KB Output is correct
58 Correct 76 ms 26908 KB Output is correct
59 Correct 87 ms 44824 KB Output is correct
60 Correct 219 ms 74052 KB Output is correct
61 Correct 220 ms 42764 KB Output is correct
62 Correct 203 ms 39456 KB Output is correct
63 Correct 233 ms 39532 KB Output is correct
64 Correct 422 ms 89468 KB Output is correct
65 Correct 414 ms 89796 KB Output is correct
66 Correct 240 ms 69168 KB Output is correct
67 Correct 185 ms 39504 KB Output is correct
68 Correct 334 ms 57632 KB Output is correct
69 Correct 320 ms 58292 KB Output is correct
70 Correct 312 ms 55748 KB Output is correct