oj.uz

답안 #826114

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
826114 2023-08-15T10:29:54 Z SoulKnight 경주 (Race) (IOI11_race) C++17
100 / 100
 2422 ms 53964 KB 
#include "race.h"
#include "bits/stdc++.h"
using namespace std;

#define ll long long
#define ln '\n'

const int N = 2e5 + 5;
const int LG = 20;
const int INF = 0x3f3f3f3f;
const int MOD = 998244353;


int n, k;
int h[N][2], l[N];

int sz[N], ans = INF;
vector<pair<int, int>> adj[N];
bitset<N> removed;

map<ll, int> mn;


void init(){
    cin >> n >> k;
    for (int i = 0; i < n-1; i++) cin >> h[i][0] >> h[i][1] >> l[i];
}

int get_size(int u, int p){
    sz[u] = 1;
    for (auto& [v, e]: adj[u]){
        if (v == p || removed[v]) continue;
        sz[u] += get_size(v, u);
    }
    return sz[u];
}

int get_centroid(int u, int p, int s){
    for (auto& [v, e]: adj[u]){
        if (v == p || removed[v]) continue;
        if (sz[v] > s / 2) return get_centroid(v, u, s);
    }
    return u;
}

void dfs(int u, int p, int dep, int cur_len, int m){
    // cout << u << ' ' << p << ' ' << dep << ' ' << cur_len << ' ' << m << ln;
    if (cur_len > k) return;

    if (mn.find(k-cur_len) == mn.end()) mn[k-cur_len] = INF;
    if (mn.find(cur_len) == mn.end()) mn[cur_len] = INF;

    if (m == 1) {ans = min(ans, dep + mn[k-cur_len]);}
    else mn[cur_len] = min(mn[cur_len], dep);


    for (auto& [v, e]: adj[u]){
        if (v == p || removed[v]) continue;
        dfs(v, u, dep+1, cur_len + e, m);
    }
}

void build(int u){
    int c = get_centroid(u, -1, get_size(u, -1));
    // cout << "centroid " << c << ln;
    removed[c] = 1;



    for (auto& [v, e]: adj[c]){
        if (removed[v]) continue;
        dfs(v, c, 1, e, 1);
        dfs(v, c, 1, e, 0);
    }
    // cout << ans << ln;
    mn.clear();
    mn[0] = 0;

    for (auto& [v, e]: adj[c]){
        if (removed[v]) continue;
        build(v);
    }
}


int solve(){
    for (int i = 0; i < n-1; i++){
        adj[h[i][0]].push_back({h[i][1], l[i]});
        adj[h[i][1]].push_back({h[i][0], l[i]});
    }

    mn[0] = 0;
    build(1);
    return ((ans == INF)? -1: ans);
}

void init(int N, int K, int H[][2], int L[]){
  n = N;
  k = K;
  for (int i = 0; i < n-1; i++){
    h[i][0] = H[i][0];
    h[i][1] = H[i][1];
    l[i] = L[i];
  }


}


int best_path(int N, int K, int H[][2], int L[])
{
  init(N, K, H, L);
  return solve();
}

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5020 KB Output is correct
2 Correct 3 ms 5016 KB Output is correct
3 Correct 3 ms 5048 KB Output is correct
4 Correct 3 ms 5076 KB Output is correct
5 Correct 3 ms 5024 KB Output is correct
6 Correct 3 ms 4948 KB Output is correct
7 Correct 3 ms 5016 KB Output is correct
8 Correct 3 ms 5016 KB Output is correct
9 Correct 3 ms 4948 KB Output is correct
10 Correct 2 ms 4948 KB Output is correct
11 Correct 3 ms 4972 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 2 ms 4948 KB Output is correct
15 Correct 3 ms 5016 KB Output is correct
16 Correct 2 ms 4948 KB Output is correct
17 Correct 3 ms 5020 KB Output is correct
18 Correct 3 ms 4948 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5020 KB Output is correct
2 Correct 3 ms 5016 KB Output is correct
3 Correct 3 ms 5048 KB Output is correct
4 Correct 3 ms 5076 KB Output is correct
5 Correct 3 ms 5024 KB Output is correct
6 Correct 3 ms 4948 KB Output is correct
7 Correct 3 ms 5016 KB Output is correct
8 Correct 3 ms 5016 KB Output is correct
9 Correct 3 ms 4948 KB Output is correct
10 Correct 2 ms 4948 KB Output is correct
11 Correct 3 ms 4972 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 2 ms 4948 KB Output is correct
15 Correct 3 ms 5016 KB Output is correct
16 Correct 2 ms 4948 KB Output is correct
17 Correct 3 ms 5020 KB Output is correct
18 Correct 3 ms 4948 KB Output is correct
19 Correct 3 ms 5020 KB Output is correct
20 Correct 3 ms 4948 KB Output is correct
21 Correct 6 ms 5024 KB Output is correct
22 Correct 4 ms 5076 KB Output is correct
23 Correct 4 ms 5076 KB Output is correct
24 Correct 4 ms 5076 KB Output is correct
25 Correct 5 ms 5156 KB Output is correct
26 Correct 4 ms 5076 KB Output is correct
27 Correct 4 ms 5028 KB Output is correct
28 Correct 5 ms 5160 KB Output is correct
29 Correct 5 ms 5216 KB Output is correct
30 Correct 5 ms 5204 KB Output is correct
31 Correct 6 ms 5160 KB Output is correct
32 Correct 5 ms 5240 KB Output is correct
33 Correct 6 ms 5248 KB Output is correct
34 Correct 4 ms 5028 KB Output is correct
35 Correct 5 ms 5076 KB Output is correct
36 Correct 4 ms 5076 KB Output is correct
37 Correct 5 ms 5212 KB Output is correct
38 Correct 6 ms 5220 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5020 KB Output is correct
2 Correct 3 ms 5016 KB Output is correct
3 Correct 3 ms 5048 KB Output is correct
4 Correct 3 ms 5076 KB Output is correct
5 Correct 3 ms 5024 KB Output is correct
6 Correct 3 ms 4948 KB Output is correct
7 Correct 3 ms 5016 KB Output is correct
8 Correct 3 ms 5016 KB Output is correct
9 Correct 3 ms 4948 KB Output is correct
10 Correct 2 ms 4948 KB Output is correct
11 Correct 3 ms 4972 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 2 ms 4948 KB Output is correct
15 Correct 3 ms 5016 KB Output is correct
16 Correct 2 ms 4948 KB Output is correct
17 Correct 3 ms 5020 KB Output is correct
18 Correct 3 ms 4948 KB Output is correct
19 Correct 224 ms 12784 KB Output is correct
20 Correct 222 ms 12776 KB Output is correct
21 Correct 250 ms 12804 KB Output is correct
22 Correct 222 ms 12892 KB Output is correct
23 Correct 103 ms 13116 KB Output is correct
24 Correct 81 ms 13004 KB Output is correct
25 Correct 175 ms 17896 KB Output is correct
26 Correct 121 ms 18500 KB Output is correct
27 Correct 215 ms 20848 KB Output is correct
28 Correct 249 ms 31484 KB Output is correct
29 Correct 242 ms 27320 KB Output is correct
30 Correct 218 ms 20952 KB Output is correct
31 Correct 224 ms 20908 KB Output is correct
32 Correct 229 ms 21052 KB Output is correct
33 Correct 317 ms 19720 KB Output is correct
34 Correct 138 ms 20656 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5020 KB Output is correct
2 Correct 3 ms 5016 KB Output is correct
3 Correct 3 ms 5048 KB Output is correct
4 Correct 3 ms 5076 KB Output is correct
5 Correct 3 ms 5024 KB Output is correct
6 Correct 3 ms 4948 KB Output is correct
7 Correct 3 ms 5016 KB Output is correct
8 Correct 3 ms 5016 KB Output is correct
9 Correct 3 ms 4948 KB Output is correct
10 Correct 2 ms 4948 KB Output is correct
11 Correct 3 ms 4972 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 2 ms 4948 KB Output is correct
15 Correct 3 ms 5016 KB Output is correct
16 Correct 2 ms 4948 KB Output is correct
17 Correct 3 ms 5020 KB Output is correct
18 Correct 3 ms 4948 KB Output is correct
19 Correct 3 ms 5020 KB Output is correct
20 Correct 3 ms 4948 KB Output is correct
21 Correct 6 ms 5024 KB Output is correct
22 Correct 4 ms 5076 KB Output is correct
23 Correct 4 ms 5076 KB Output is correct
24 Correct 4 ms 5076 KB Output is correct
25 Correct 5 ms 5156 KB Output is correct
26 Correct 4 ms 5076 KB Output is correct
27 Correct 4 ms 5028 KB Output is correct
28 Correct 5 ms 5160 KB Output is correct
29 Correct 5 ms 5216 KB Output is correct
30 Correct 5 ms 5204 KB Output is correct
31 Correct 6 ms 5160 KB Output is correct
32 Correct 5 ms 5240 KB Output is correct
33 Correct 6 ms 5248 KB Output is correct
34 Correct 4 ms 5028 KB Output is correct
35 Correct 5 ms 5076 KB Output is correct
36 Correct 4 ms 5076 KB Output is correct
37 Correct 5 ms 5212 KB Output is correct
38 Correct 6 ms 5220 KB Output is correct
39 Correct 224 ms 12784 KB Output is correct
40 Correct 222 ms 12776 KB Output is correct
41 Correct 250 ms 12804 KB Output is correct
42 Correct 222 ms 12892 KB Output is correct
43 Correct 103 ms 13116 KB Output is correct
44 Correct 81 ms 13004 KB Output is correct
45 Correct 175 ms 17896 KB Output is correct
46 Correct 121 ms 18500 KB Output is correct
47 Correct 215 ms 20848 KB Output is correct
48 Correct 249 ms 31484 KB Output is correct
49 Correct 242 ms 27320 KB Output is correct
50 Correct 218 ms 20952 KB Output is correct
51 Correct 224 ms 20908 KB Output is correct
52 Correct 229 ms 21052 KB Output is correct
53 Correct 317 ms 19720 KB Output is correct
54 Correct 138 ms 20656 KB Output is correct
55 Correct 37 ms 6064 KB Output is correct
56 Correct 23 ms 5764 KB Output is correct
57 Correct 215 ms 13008 KB Output is correct
58 Correct 45 ms 12748 KB Output is correct
59 Correct 782 ms 27376 KB Output is correct
60 Correct 2422 ms 53964 KB Output is correct
61 Correct 375 ms 21412 KB Output is correct
62 Correct 470 ms 21496 KB Output is correct
63 Correct 600 ms 21496 KB Output is correct
64 Correct 2301 ms 33448 KB Output is correct
65 Correct 134 ms 21840 KB Output is correct
66 Correct 1255 ms 31200 KB Output is correct
67 Correct 133 ms 21788 KB Output is correct
68 Correct 753 ms 31324 KB Output is correct
69 Correct 740 ms 31180 KB Output is correct
70 Correct 677 ms 30332 KB Output is correct