oj.uz

Submission #936082

# Submission time Handle Problem Language Result Execution time Memory
936082 2024-03-01T06:12:34 Z Yell0 Race (IOI11_race) C++17
100 / 100
 1266 ms 60628 KB 
#include <bits/stdc++.h>

using namespace std;
typedef pair<int,int> pii;
typedef long long ll;
const int MN=2e5+2;
int N,K,stsz[MN],ans=INT_MAX;
set<pii> adj[MN],minlen;

void find_stsz(int u, int p) {
  stsz[u] = 1;
  for(auto [v, l] : adj[u]) {
    if(v == p) continue;
    find_stsz(v, u);
    stsz[u] += stsz[v];
  }
}
int find_centroid(int u, int p, int root) {
  for(auto [v, l] : adj[u]) {
    if(v == p) continue;
    if(stsz[v] > stsz[root]/2) return find_centroid(v, u, root);
  }
  return u;
}

void dfs_upd(int u, int p, int dist, int dep) {
  if(dist > K) return;
  auto it = minlen.lower_bound(pii(dist,0));
  if(it == minlen.end() || (*it).first != dist) minlen.insert(pii(dist,dep));
  else if((*it).second > dep) {
    minlen.erase(it);
    minlen.insert(pii(dist,dep));
  }

  for(auto [v, l] : adj[u]) {
    if(v == p) continue;
    dfs_upd(v, u, dist+l, dep+1);
  }
}
void dfs_search(int u, int p, int dist, int dep) {
  if(dist > K) return;
  auto it = minlen.lower_bound(pii(K-dist,0));
  if(it != minlen.end() && (*it).first == K-dist) ans = min(ans, (*it).second+dep);
  for(auto [v, l] : adj[u]) {
    if(v == p) continue;
    dfs_search(v, u, dist+l, dep+1);
  }
}

int best_path(int n, int k, int H[][2], int L[]) {
  N = n;
  K = k;
  for(int i = 0; i < N-1; ++i) {
    adj[H[i][0]].insert(pii(H[i][1], L[i]));
    adj[H[i][1]].insert(pii(H[i][0], L[i]));
  }

  queue<int> q;
  q.push(0);
  while(!q.empty()) {
    int u = q.front();
    q.pop();
    minlen.clear();
    minlen.insert(pii(0,0));

    find_stsz(u, -1);
    int cen = find_centroid(u, -1, u);

    for(auto [v, l] : adj[cen]) {
      dfs_search(v, cen, l, 1);
      dfs_upd(v, cen, l, 1);

      adj[v].erase(pii(cen, l));
      q.push(v);
    }
  }

  return (ans==INT_MAX?-1:ans);
}

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 13404 KB Output is correct
2 Correct 2 ms 13404 KB Output is correct
3 Correct 3 ms 13656 KB Output is correct
4 Correct 2 ms 13404 KB Output is correct
5 Correct 2 ms 13404 KB Output is correct
6 Correct 2 ms 13400 KB Output is correct
7 Correct 3 ms 13404 KB Output is correct
8 Correct 3 ms 13404 KB Output is correct
9 Correct 2 ms 13404 KB Output is correct
10 Correct 2 ms 13400 KB Output is correct
11 Correct 2 ms 13404 KB Output is correct
12 Correct 3 ms 13404 KB Output is correct
13 Correct 2 ms 13404 KB Output is correct
14 Correct 2 ms 13404 KB Output is correct
15 Correct 4 ms 13496 KB Output is correct
16 Correct 3 ms 13404 KB Output is correct
17 Correct 3 ms 13504 KB Output is correct
18 Correct 3 ms 13400 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 13404 KB Output is correct
2 Correct 2 ms 13404 KB Output is correct
3 Correct 3 ms 13656 KB Output is correct
4 Correct 2 ms 13404 KB Output is correct
5 Correct 2 ms 13404 KB Output is correct
6 Correct 2 ms 13400 KB Output is correct
7 Correct 3 ms 13404 KB Output is correct
8 Correct 3 ms 13404 KB Output is correct
9 Correct 2 ms 13404 KB Output is correct
10 Correct 2 ms 13400 KB Output is correct
11 Correct 2 ms 13404 KB Output is correct
12 Correct 3 ms 13404 KB Output is correct
13 Correct 2 ms 13404 KB Output is correct
14 Correct 2 ms 13404 KB Output is correct
15 Correct 4 ms 13496 KB Output is correct
16 Correct 3 ms 13404 KB Output is correct
17 Correct 3 ms 13504 KB Output is correct
18 Correct 3 ms 13400 KB Output is correct
19 Correct 3 ms 13404 KB Output is correct
20 Correct 2 ms 13404 KB Output is correct
21 Correct 4 ms 13592 KB Output is correct
22 Correct 3 ms 13404 KB Output is correct
23 Correct 4 ms 13404 KB Output is correct
24 Correct 3 ms 13404 KB Output is correct
25 Correct 4 ms 13400 KB Output is correct
26 Correct 3 ms 13404 KB Output is correct
27 Correct 3 ms 13404 KB Output is correct
28 Correct 4 ms 13404 KB Output is correct
29 Correct 4 ms 13404 KB Output is correct
30 Correct 4 ms 13480 KB Output is correct
31 Correct 4 ms 13484 KB Output is correct
32 Correct 4 ms 13404 KB Output is correct
33 Correct 4 ms 13404 KB Output is correct
34 Correct 6 ms 13404 KB Output is correct
35 Correct 4 ms 13404 KB Output is correct
36 Correct 4 ms 13404 KB Output is correct
37 Correct 4 ms 13404 KB Output is correct
38 Correct 6 ms 13500 KB Output is correct

Subtask #3
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 13404 KB Output is correct
2 Correct 2 ms 13404 KB Output is correct
3 Correct 3 ms 13656 KB Output is correct
4 Correct 2 ms 13404 KB Output is correct
5 Correct 2 ms 13404 KB Output is correct
6 Correct 2 ms 13400 KB Output is correct
7 Correct 3 ms 13404 KB Output is correct
8 Correct 3 ms 13404 KB Output is correct
9 Correct 2 ms 13404 KB Output is correct
10 Correct 2 ms 13400 KB Output is correct
11 Correct 2 ms 13404 KB Output is correct
12 Correct 3 ms 13404 KB Output is correct
13 Correct 2 ms 13404 KB Output is correct
14 Correct 2 ms 13404 KB Output is correct
15 Correct 4 ms 13496 KB Output is correct
16 Correct 3 ms 13404 KB Output is correct
17 Correct 3 ms 13504 KB Output is correct
18 Correct 3 ms 13400 KB Output is correct
19 Correct 269 ms 25636 KB Output is correct
20 Correct 301 ms 26648 KB Output is correct
21 Correct 268 ms 26304 KB Output is correct
22 Correct 238 ms 26756 KB Output is correct
23 Correct 143 ms 26904 KB Output is correct
24 Correct 118 ms 26968 KB Output is correct
25 Correct 236 ms 30796 KB Output is correct
26 Correct 111 ms 34060 KB Output is correct
27 Correct 347 ms 36972 KB Output is correct
28 Correct 545 ms 53048 KB Output is correct
29 Correct 503 ms 51796 KB Output is correct
30 Correct 348 ms 37332 KB Output is correct
31 Correct 322 ms 37592 KB Output is correct
32 Correct 533 ms 37344 KB Output is correct
33 Correct 517 ms 37968 KB Output is correct
34 Correct 371 ms 37972 KB Output is correct

Subtask #4
57.0 / 57.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 13404 KB Output is correct
2 Correct 2 ms 13404 KB Output is correct
3 Correct 3 ms 13656 KB Output is correct
4 Correct 2 ms 13404 KB Output is correct
5 Correct 2 ms 13404 KB Output is correct
6 Correct 2 ms 13400 KB Output is correct
7 Correct 3 ms 13404 KB Output is correct
8 Correct 3 ms 13404 KB Output is correct
9 Correct 2 ms 13404 KB Output is correct
10 Correct 2 ms 13400 KB Output is correct
11 Correct 2 ms 13404 KB Output is correct
12 Correct 3 ms 13404 KB Output is correct
13 Correct 2 ms 13404 KB Output is correct
14 Correct 2 ms 13404 KB Output is correct
15 Correct 4 ms 13496 KB Output is correct
16 Correct 3 ms 13404 KB Output is correct
17 Correct 3 ms 13504 KB Output is correct
18 Correct 3 ms 13400 KB Output is correct
19 Correct 3 ms 13404 KB Output is correct
20 Correct 2 ms 13404 KB Output is correct
21 Correct 4 ms 13592 KB Output is correct
22 Correct 3 ms 13404 KB Output is correct
23 Correct 4 ms 13404 KB Output is correct
24 Correct 3 ms 13404 KB Output is correct
25 Correct 4 ms 13400 KB Output is correct
26 Correct 3 ms 13404 KB Output is correct
27 Correct 3 ms 13404 KB Output is correct
28 Correct 4 ms 13404 KB Output is correct
29 Correct 4 ms 13404 KB Output is correct
30 Correct 4 ms 13480 KB Output is correct
31 Correct 4 ms 13484 KB Output is correct
32 Correct 4 ms 13404 KB Output is correct
33 Correct 4 ms 13404 KB Output is correct
34 Correct 6 ms 13404 KB Output is correct
35 Correct 4 ms 13404 KB Output is correct
36 Correct 4 ms 13404 KB Output is correct
37 Correct 4 ms 13404 KB Output is correct
38 Correct 6 ms 13500 KB Output is correct
39 Correct 269 ms 25636 KB Output is correct
40 Correct 301 ms 26648 KB Output is correct
41 Correct 268 ms 26304 KB Output is correct
42 Correct 238 ms 26756 KB Output is correct
43 Correct 143 ms 26904 KB Output is correct
44 Correct 118 ms 26968 KB Output is correct
45 Correct 236 ms 30796 KB Output is correct
46 Correct 111 ms 34060 KB Output is correct
47 Correct 347 ms 36972 KB Output is correct
48 Correct 545 ms 53048 KB Output is correct
49 Correct 503 ms 51796 KB Output is correct
50 Correct 348 ms 37332 KB Output is correct
51 Correct 322 ms 37592 KB Output is correct
52 Correct 533 ms 37344 KB Output is correct
53 Correct 517 ms 37968 KB Output is correct
54 Correct 371 ms 37972 KB Output is correct
55 Correct 21 ms 14684 KB Output is correct
56 Correct 15 ms 14428 KB Output is correct
57 Correct 131 ms 25664 KB Output is correct
58 Correct 61 ms 26872 KB Output is correct
59 Correct 248 ms 37460 KB Output is correct
60 Correct 1201 ms 60628 KB Output is correct
61 Correct 378 ms 36868 KB Output is correct
62 Correct 412 ms 37564 KB Output is correct
63 Correct 624 ms 37456 KB Output is correct
64 Correct 1266 ms 40792 KB Output is correct
65 Correct 459 ms 36832 KB Output is correct
66 Correct 836 ms 47428 KB Output is correct
67 Correct 295 ms 39248 KB Output is correct
68 Correct 682 ms 40796 KB Output is correct
69 Correct 607 ms 38780 KB Output is correct
70 Correct 533 ms 40016 KB Output is correct