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답안 #881997

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
881997 2023-12-02T11:46:33 Z chanhchuong123 경주 (Race) (IOI11_race) C++17
100 / 100
 324 ms 38296 KB 
#include <bits/stdc++.h>
#include <race.h>
using namespace std;
#define task ""
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()

const int INF = 1e9 + 7;
const int MAX = 200020;
int n, k;
vector<pair<int, int>> adj[MAX];

int sz[MAX];
bool rem[MAX];

int dfsSZ(int u, int p) {
    sz[u] = 1;
    for (auto [v, w]: adj[u]) if (v != p && !rem[v]) {
        sz[u] += dfsSZ(v, u);
    }
    return sz[u];
}

int findCentroid(int u, int p, int n) {
    for (auto [v, w]: adj[u]) if (v != p && !rem[v]) {
        if (2 * sz[v] > n)
            return findCentroid(v, u, n);
    }
    return u;
}

int h[MAX];
int dep[MAX];
int res = +INF;
int maxHigh[1000010];

void dfs(int u, int p, bool upd) {
    if (dep[u] > k) return;
    if (!upd) res = min(res, h[u] + maxHigh[k - dep[u]]);
    if (upd) maxHigh[dep[u]] = min(maxHigh[dep[u]], h[u]);
    for (auto [v, w]: adj[u]) if (v != p && !rem[v]) {
        dep[v] = dep[u] + w;
        h[v] = h[u] + 1;
        dfs(v, u, upd);
    }
}

void del(int u, int p) {
    if (dep[u] > k) return;
    maxHigh[dep[u]] = +INF;
    for (auto [v, w]: adj[u]) if (v != p && !rem[v]) del(v, u);
}

void solve(int u, int p) {
    int c = findCentroid(u, p, dfsSZ(u, p)); rem[c] = true;

    dep[c] = h[c] = 0;
    for (auto [v, w]: adj[c]) if (v != p && !rem[v]) {
        dep[v] = dep[c] + w;
        h[v] = h[c] + 1;
        dfs(v, c, 0);
        dfs(v, c, 1);
    }
    for (auto [v, w]: adj[c]) if (v != p && !rem[v]) {
        del(v, c);
    }

    for (auto [v, w]: adj[c]) if (v != p && !rem[v]) {
        solve(v, c);
    }
}

int best_path(int _n, int _k, int H[][2], int L[]) {
	n = _n; k = _k;
    for (int i = 0; i <= k; ++i) {
        maxHigh[i] = +INF;
    }
	for (int i = 0; i < n - 1; i++) {
		int u = H[i][0], v = H[i][1], l = L[i];
		adj[u].emplace_back(v, l);
        adj[v].emplace_back(u, l);
	}
	maxHigh[0] = 0; solve(0, -1);
  	return (res == +INF ? -1 : res);
}

//int main() {
//	ios_base::sync_with_stdio(false); cin.tie(nullptr);
//
//	if (fopen(task".inp", "r")) {
//		freopen(task".inp", "r",  stdin);
//		freopen(task".out", "w", stdout);
//	}
//
//    cin >> n >> k;
//    for (int i = 0; i <= k; ++i) {
//        maxHigh[i] = +INF;
//    }
//    for (int i = 1; i < n; ++i) {
//        int u, v, l; cin >> u >> v >> l;
//        adj[u].emplace_back(v, l);
//        adj[v].emplace_back(u, l);
//    }
//    maxHigh[0] = 0; solve(0, -1);
//    cout << (res == INF ? -1 : res);
//	return 0;
//}

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 13148 KB Output is correct
2 Correct 2 ms 13148 KB Output is correct
3 Correct 2 ms 13304 KB Output is correct
4 Correct 2 ms 13148 KB Output is correct
5 Correct 3 ms 13148 KB Output is correct
6 Correct 2 ms 13184 KB Output is correct
7 Correct 2 ms 13148 KB Output is correct
8 Correct 2 ms 13148 KB Output is correct
9 Correct 2 ms 13148 KB Output is correct
10 Correct 2 ms 13148 KB Output is correct
11 Correct 2 ms 13400 KB Output is correct
12 Correct 2 ms 13148 KB Output is correct
13 Correct 2 ms 13148 KB Output is correct
14 Correct 3 ms 13148 KB Output is correct
15 Correct 2 ms 13148 KB Output is correct
16 Correct 2 ms 13148 KB Output is correct
17 Correct 2 ms 13148 KB Output is correct
18 Correct 3 ms 13148 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 13148 KB Output is correct
2 Correct 2 ms 13148 KB Output is correct
3 Correct 2 ms 13304 KB Output is correct
4 Correct 2 ms 13148 KB Output is correct
5 Correct 3 ms 13148 KB Output is correct
6 Correct 2 ms 13184 KB Output is correct
7 Correct 2 ms 13148 KB Output is correct
8 Correct 2 ms 13148 KB Output is correct
9 Correct 2 ms 13148 KB Output is correct
10 Correct 2 ms 13148 KB Output is correct
11 Correct 2 ms 13400 KB Output is correct
12 Correct 2 ms 13148 KB Output is correct
13 Correct 2 ms 13148 KB Output is correct
14 Correct 3 ms 13148 KB Output is correct
15 Correct 2 ms 13148 KB Output is correct
16 Correct 2 ms 13148 KB Output is correct
17 Correct 2 ms 13148 KB Output is correct
18 Correct 3 ms 13148 KB Output is correct
19 Correct 3 ms 13148 KB Output is correct
20 Correct 2 ms 13176 KB Output is correct
21 Correct 3 ms 13148 KB Output is correct
22 Correct 3 ms 15248 KB Output is correct
23 Correct 3 ms 15196 KB Output is correct
24 Correct 3 ms 15196 KB Output is correct
25 Correct 3 ms 15196 KB Output is correct
26 Correct 3 ms 15196 KB Output is correct
27 Correct 3 ms 15192 KB Output is correct
28 Correct 3 ms 15196 KB Output is correct
29 Correct 3 ms 15196 KB Output is correct
30 Correct 3 ms 15196 KB Output is correct
31 Correct 4 ms 15204 KB Output is correct
32 Correct 3 ms 15196 KB Output is correct
33 Correct 3 ms 15192 KB Output is correct
34 Correct 3 ms 15192 KB Output is correct
35 Correct 4 ms 15228 KB Output is correct
36 Correct 4 ms 15196 KB Output is correct
37 Correct 3 ms 15196 KB Output is correct
38 Correct 3 ms 15280 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 13148 KB Output is correct
2 Correct 2 ms 13148 KB Output is correct
3 Correct 2 ms 13304 KB Output is correct
4 Correct 2 ms 13148 KB Output is correct
5 Correct 3 ms 13148 KB Output is correct
6 Correct 2 ms 13184 KB Output is correct
7 Correct 2 ms 13148 KB Output is correct
8 Correct 2 ms 13148 KB Output is correct
9 Correct 2 ms 13148 KB Output is correct
10 Correct 2 ms 13148 KB Output is correct
11 Correct 2 ms 13400 KB Output is correct
12 Correct 2 ms 13148 KB Output is correct
13 Correct 2 ms 13148 KB Output is correct
14 Correct 3 ms 13148 KB Output is correct
15 Correct 2 ms 13148 KB Output is correct
16 Correct 2 ms 13148 KB Output is correct
17 Correct 2 ms 13148 KB Output is correct
18 Correct 3 ms 13148 KB Output is correct
19 Correct 93 ms 20400 KB Output is correct
20 Correct 92 ms 20396 KB Output is correct
21 Correct 99 ms 20416 KB Output is correct
22 Correct 97 ms 20736 KB Output is correct
23 Correct 50 ms 20572 KB Output is correct
24 Correct 40 ms 20560 KB Output is correct
25 Correct 96 ms 23160 KB Output is correct
26 Correct 77 ms 25968 KB Output is correct
27 Correct 103 ms 25616 KB Output is correct
28 Correct 212 ms 37188 KB Output is correct
29 Correct 159 ms 36180 KB Output is correct
30 Correct 106 ms 25740 KB Output is correct
31 Correct 103 ms 25728 KB Output is correct
32 Correct 122 ms 25940 KB Output is correct
33 Correct 146 ms 24468 KB Output is correct
34 Correct 111 ms 25624 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 13148 KB Output is correct
2 Correct 2 ms 13148 KB Output is correct
3 Correct 2 ms 13304 KB Output is correct
4 Correct 2 ms 13148 KB Output is correct
5 Correct 3 ms 13148 KB Output is correct
6 Correct 2 ms 13184 KB Output is correct
7 Correct 2 ms 13148 KB Output is correct
8 Correct 2 ms 13148 KB Output is correct
9 Correct 2 ms 13148 KB Output is correct
10 Correct 2 ms 13148 KB Output is correct
11 Correct 2 ms 13400 KB Output is correct
12 Correct 2 ms 13148 KB Output is correct
13 Correct 2 ms 13148 KB Output is correct
14 Correct 3 ms 13148 KB Output is correct
15 Correct 2 ms 13148 KB Output is correct
16 Correct 2 ms 13148 KB Output is correct
17 Correct 2 ms 13148 KB Output is correct
18 Correct 3 ms 13148 KB Output is correct
19 Correct 3 ms 13148 KB Output is correct
20 Correct 2 ms 13176 KB Output is correct
21 Correct 3 ms 13148 KB Output is correct
22 Correct 3 ms 15248 KB Output is correct
23 Correct 3 ms 15196 KB Output is correct
24 Correct 3 ms 15196 KB Output is correct
25 Correct 3 ms 15196 KB Output is correct
26 Correct 3 ms 15196 KB Output is correct
27 Correct 3 ms 15192 KB Output is correct
28 Correct 3 ms 15196 KB Output is correct
29 Correct 3 ms 15196 KB Output is correct
30 Correct 3 ms 15196 KB Output is correct
31 Correct 4 ms 15204 KB Output is correct
32 Correct 3 ms 15196 KB Output is correct
33 Correct 3 ms 15192 KB Output is correct
34 Correct 3 ms 15192 KB Output is correct
35 Correct 4 ms 15228 KB Output is correct
36 Correct 4 ms 15196 KB Output is correct
37 Correct 3 ms 15196 KB Output is correct
38 Correct 3 ms 15280 KB Output is correct
39 Correct 93 ms 20400 KB Output is correct
40 Correct 92 ms 20396 KB Output is correct
41 Correct 99 ms 20416 KB Output is correct
42 Correct 97 ms 20736 KB Output is correct
43 Correct 50 ms 20572 KB Output is correct
44 Correct 40 ms 20560 KB Output is correct
45 Correct 96 ms 23160 KB Output is correct
46 Correct 77 ms 25968 KB Output is correct
47 Correct 103 ms 25616 KB Output is correct
48 Correct 212 ms 37188 KB Output is correct
49 Correct 159 ms 36180 KB Output is correct
50 Correct 106 ms 25740 KB Output is correct
51 Correct 103 ms 25728 KB Output is correct
52 Correct 122 ms 25940 KB Output is correct
53 Correct 146 ms 24468 KB Output is correct
54 Correct 111 ms 25624 KB Output is correct
55 Correct 11 ms 13556 KB Output is correct
56 Correct 10 ms 13660 KB Output is correct
57 Correct 62 ms 20636 KB Output is correct
58 Correct 27 ms 20164 KB Output is correct
59 Correct 76 ms 27996 KB Output is correct
60 Correct 324 ms 38296 KB Output is correct
61 Correct 137 ms 26016 KB Output is correct
62 Correct 130 ms 27988 KB Output is correct
63 Correct 171 ms 28016 KB Output is correct
64 Correct 303 ms 28452 KB Output is correct
65 Correct 119 ms 26628 KB Output is correct
66 Correct 244 ms 36388 KB Output is correct
67 Correct 76 ms 28532 KB Output is correct
68 Correct 161 ms 28660 KB Output is correct
69 Correct 158 ms 28756 KB Output is correct
70 Correct 148 ms 28372 KB Output is correct