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답안 #541580

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
541580 2022-03-23T19:16:12 Z georgerapeanu 경주 (Race) (IOI11_race) C++11
100 / 100
 920 ms 47948 KB 
#include "race.h"

#pragma once
#include <bits/stdc++.h>
using namespace std;

int n, k;
vector<vector<pair<int, int> > > graph;
vector<int> lvl;
vector<long long> lvl_cost;
vector<int> weight;

void predfs(int nod, int tata){
  for(auto it:graph[nod]){
    if(it.first == tata){
      continue;
    }
    lvl[it.first] = 1 + lvl[nod];
    lvl_cost[it.first] = it.second + lvl_cost[nod];
    predfs(it.first, nod);
    weight[nod] += weight[it.first];
  }
}

unordered_map<long long, int> mp;

void add(int nod){
  if(mp.count(lvl_cost[nod]) == 0){
    mp[lvl_cost[nod]] = lvl[nod];
  }else{
    mp[lvl_cost[nod]] = min(mp[lvl_cost[nod]], lvl[nod]);
  }
}

int ans_length = (1 << 30);

void update(long long target, int root, int nod){
  if(mp.count(target) == 0){
    return ;
  }
  ans_length = min(ans_length, mp[target] + lvl[nod] - 2 * lvl[root]);
}


void dfs_add(int nod, int tata){
  add(nod);
  for(auto it:graph[nod]){
    if(it.first == tata){
      continue;
    }
    dfs_add(it.first, nod);
  }
}

void dfs_view(int root, int nod, int tata){
  long long target = k - (lvl_cost[nod] - lvl_cost[root]) + lvl_cost[root];
  update(target, root, nod);
  for(auto it:graph[nod]){
    if(it.first == tata){
      continue;
    }
    dfs_view(root, it.first, nod);
  }
}

void dfs(int nod, int tata, bool dump){ 
  int heavyChild = -1;
  for(auto it:graph[nod]){
    if(it.first == tata){
      continue;
    }
    if(heavyChild == -1 || weight[it.first] > weight[heavyChild]){
      heavyChild = it.first;
    }
  }

  for(auto it:graph[nod]){
    if(it.first == tata || it.first == heavyChild){
      continue;
    }
    dfs(it.first, nod, true);
  }
  if(heavyChild != -1){
    dfs(heavyChild, nod, false);
  }
  add(nod);
  for(auto it:graph[nod]){
    if(it.first == tata || it.first == heavyChild){
      continue;
    }
    dfs_view(nod, it.first, nod);
    dfs_add(it.first, nod);
  }

  update(lvl_cost[nod] + k, nod, nod);

  
  if(dump){
    mp.clear();
  }
}

int best_path(int _n, int _k, int h[][2], int l[]){
  n = _n;
  k = _k;
  graph = vector<vector<pair<int,int> > >(n + 1, vector<pair<int, int> >());
  lvl = vector<int>(n + 1,0);
  lvl_cost = vector<long long>(n + 1, 0);
  weight = vector<int>(n + 1, 1);
  for(int i = 0;i < n - 1;i++){
    graph[h[i][0] + 1].push_back({h[i][1] + 1, l[i]});
    graph[h[i][1] + 1].push_back({h[i][0] + 1, l[i]});
  }

  predfs(1, 0);
  dfs(1, 0, true);
  
  return (ans_length == (1 << 30) ? -1:ans_length);
}

Compilation message

race.cpp:3:9: warning: #pragma once in main file
    3 | #pragma once
      |         ^~~~

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 308 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 304 KB Output is correct
17 Correct 1 ms 212 KB Output is correct
18 Correct 1 ms 308 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 308 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 304 KB Output is correct
17 Correct 1 ms 212 KB Output is correct
18 Correct 1 ms 308 KB Output is correct
19 Correct 1 ms 308 KB Output is correct
20 Correct 1 ms 212 KB Output is correct
21 Correct 2 ms 312 KB Output is correct
22 Correct 1 ms 448 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 1 ms 340 KB Output is correct
25 Correct 1 ms 340 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 2 ms 340 KB Output is correct
28 Correct 1 ms 444 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 1 ms 340 KB Output is correct
31 Correct 1 ms 436 KB Output is correct
32 Correct 1 ms 340 KB Output is correct
33 Correct 2 ms 340 KB Output is correct
34 Correct 1 ms 452 KB Output is correct
35 Correct 1 ms 340 KB Output is correct
36 Correct 1 ms 340 KB Output is correct
37 Correct 1 ms 340 KB Output is correct
38 Correct 1 ms 340 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 308 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 304 KB Output is correct
17 Correct 1 ms 212 KB Output is correct
18 Correct 1 ms 308 KB Output is correct
19 Correct 109 ms 9324 KB Output is correct
20 Correct 125 ms 10424 KB Output is correct
21 Correct 137 ms 10424 KB Output is correct
22 Correct 131 ms 10536 KB Output is correct
23 Correct 113 ms 10696 KB Output is correct
24 Correct 107 ms 10768 KB Output is correct
25 Correct 58 ms 15096 KB Output is correct
26 Correct 45 ms 19240 KB Output is correct
27 Correct 173 ms 20944 KB Output is correct
28 Correct 186 ms 47948 KB Output is correct
29 Correct 186 ms 46644 KB Output is correct
30 Correct 204 ms 21068 KB Output is correct
31 Correct 167 ms 20952 KB Output is correct
32 Correct 252 ms 21140 KB Output is correct
33 Correct 192 ms 19960 KB Output is correct
34 Correct 315 ms 30216 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 308 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 304 KB Output is correct
17 Correct 1 ms 212 KB Output is correct
18 Correct 1 ms 308 KB Output is correct
19 Correct 1 ms 308 KB Output is correct
20 Correct 1 ms 212 KB Output is correct
21 Correct 2 ms 312 KB Output is correct
22 Correct 1 ms 448 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 1 ms 340 KB Output is correct
25 Correct 1 ms 340 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 2 ms 340 KB Output is correct
28 Correct 1 ms 444 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 1 ms 340 KB Output is correct
31 Correct 1 ms 436 KB Output is correct
32 Correct 1 ms 340 KB Output is correct
33 Correct 2 ms 340 KB Output is correct
34 Correct 1 ms 452 KB Output is correct
35 Correct 1 ms 340 KB Output is correct
36 Correct 1 ms 340 KB Output is correct
37 Correct 1 ms 340 KB Output is correct
38 Correct 1 ms 340 KB Output is correct
39 Correct 109 ms 9324 KB Output is correct
40 Correct 125 ms 10424 KB Output is correct
41 Correct 137 ms 10424 KB Output is correct
42 Correct 131 ms 10536 KB Output is correct
43 Correct 113 ms 10696 KB Output is correct
44 Correct 107 ms 10768 KB Output is correct
45 Correct 58 ms 15096 KB Output is correct
46 Correct 45 ms 19240 KB Output is correct
47 Correct 173 ms 20944 KB Output is correct
48 Correct 186 ms 47948 KB Output is correct
49 Correct 186 ms 46644 KB Output is correct
50 Correct 204 ms 21068 KB Output is correct
51 Correct 167 ms 20952 KB Output is correct
52 Correct 252 ms 21140 KB Output is correct
53 Correct 192 ms 19960 KB Output is correct
54 Correct 315 ms 30216 KB Output is correct
55 Correct 10 ms 1600 KB Output is correct
56 Correct 8 ms 1236 KB Output is correct
57 Correct 82 ms 10652 KB Output is correct
58 Correct 47 ms 10324 KB Output is correct
59 Correct 53 ms 23884 KB Output is correct
60 Correct 173 ms 46956 KB Output is correct
61 Correct 224 ms 22312 KB Output is correct
62 Correct 179 ms 21124 KB Output is correct
63 Correct 238 ms 21184 KB Output is correct
64 Correct 888 ms 25996 KB Output is correct
65 Correct 920 ms 31276 KB Output is correct
66 Correct 231 ms 43704 KB Output is correct
67 Correct 147 ms 21728 KB Output is correct
68 Correct 307 ms 28240 KB Output is correct
69 Correct 318 ms 28688 KB Output is correct
70 Correct 290 ms 27148 KB Output is correct