oj.uz

답안 #1085798

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1085798 2024-09-08T17:50:17 Z f0rizen 경주 (Race) (IOI11_race) C++17
100 / 100
 306 ms 33872 KB 
#include "race.h"

#include <bits/stdc++.h>

using namespace std;
using ll = long long;
const int inf = 1e9 + 7;
const ll infll = 1e18;

struct Edge {
    int to, w;
};

int k;
vector<vector<Edge>> g;
vector<bool> used;
vector<int> sz;
vector<int> dist;
int ans = inf;

void dfs_sz(int v, int p = -1) {
    sz[v] = 1;
    for (auto [u, w] : g[v]) {
        if (u != p && !used[u]) {
            dfs_sz(u, v);
            sz[v] += sz[u];
        }
    }
}

void dfs_ans(int v, int p = -1, int sum = 0, int d = 0) {
    if (k - sum < 0) {
        return;
    }
    if (dist[k - sum] < inf) {
        ans = min(ans, dist[k - sum] + d);
    }
    for (auto [u, w] : g[v]) {
        if (u != p && !used[u]) {
            dfs_ans(u, v, sum + w, d + 1);
        }
    }
}

void dfs_mp(int v, int p = -1, int sum = 0, int d = 0) {
    if (k - sum < 0) {
        return;
    }
    dist[sum] = min(dist[sum], d);
    for (auto [u, w] : g[v]) {
        if (u != p && !used[u]) {
            dfs_mp(u, v, sum + w, d + 1);
        }
    }
}

void dfs_clear(int v, int p = -1, int sum = 0) {
    if (k - sum < 0) {
        return;
    }
    dist[sum] = inf;
    for (auto [u, w] : g[v]) {
        if (u != p && !used[u]) {
            dfs_clear(u, v, sum + w);
        }
    }
}

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

void build(int v) {
    dfs_sz(v);
    dist[0] = 0;
    for (auto [u, w] : g[v]) {
        if (!used[u]) {
            dfs_ans(u, v, w, 1);
            dfs_mp(u, v, w, 1);
        }
    }
    dfs_clear(v);
    used[v] = 1;
    for (auto [u, w] : g[v]) {
        if (!used[u]) {
            build(centroid(u, v, sz[u]));
        }
    }
}

int best_path(int N, int K, int H[][2], int L[]) {
    k = K;
    g.resize(N);
    for (int i = 0; i < N - 1; ++i) {
        int u = H[i][0], v = H[i][1], w = L[i];
        g[u].push_back({v, w});
        g[v].push_back({u, w});
    }
    used.resize(N);
    sz.resize(N);
    dist.resize(1e6 + 5, inf);
    dfs_sz(0);
    build(centroid(0, -1, sz[0]));
    if (ans == inf) {
        return -1;
    } else {
        return ans;
    }
}

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 4188 KB Output is correct
2 Correct 2 ms 4188 KB Output is correct
3 Correct 2 ms 4188 KB Output is correct
4 Correct 2 ms 4388 KB Output is correct
5 Correct 2 ms 4188 KB Output is correct
6 Correct 2 ms 4188 KB Output is correct
7 Correct 2 ms 4188 KB Output is correct
8 Correct 2 ms 4188 KB Output is correct
9 Correct 2 ms 4188 KB Output is correct
10 Correct 2 ms 4188 KB Output is correct
11 Correct 2 ms 4188 KB Output is correct
12 Correct 2 ms 4188 KB Output is correct
13 Correct 2 ms 4184 KB Output is correct
14 Correct 2 ms 4324 KB Output is correct
15 Correct 2 ms 4188 KB Output is correct
16 Correct 2 ms 4188 KB Output is correct
17 Correct 2 ms 4148 KB Output is correct
18 Correct 2 ms 4184 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 4188 KB Output is correct
2 Correct 2 ms 4188 KB Output is correct
3 Correct 2 ms 4188 KB Output is correct
4 Correct 2 ms 4388 KB Output is correct
5 Correct 2 ms 4188 KB Output is correct
6 Correct 2 ms 4188 KB Output is correct
7 Correct 2 ms 4188 KB Output is correct
8 Correct 2 ms 4188 KB Output is correct
9 Correct 2 ms 4188 KB Output is correct
10 Correct 2 ms 4188 KB Output is correct
11 Correct 2 ms 4188 KB Output is correct
12 Correct 2 ms 4188 KB Output is correct
13 Correct 2 ms 4184 KB Output is correct
14 Correct 2 ms 4324 KB Output is correct
15 Correct 2 ms 4188 KB Output is correct
16 Correct 2 ms 4188 KB Output is correct
17 Correct 2 ms 4148 KB Output is correct
18 Correct 2 ms 4184 KB Output is correct
19 Correct 2 ms 4188 KB Output is correct
20 Correct 2 ms 4188 KB Output is correct
21 Correct 3 ms 4444 KB Output is correct
22 Correct 3 ms 4444 KB Output is correct
23 Correct 2 ms 4444 KB Output is correct
24 Correct 2 ms 4444 KB Output is correct
25 Correct 3 ms 4444 KB Output is correct
26 Correct 2 ms 4444 KB Output is correct
27 Correct 2 ms 4444 KB Output is correct
28 Correct 5 ms 4448 KB Output is correct
29 Correct 2 ms 4444 KB Output is correct
30 Correct 3 ms 4444 KB Output is correct
31 Correct 3 ms 4296 KB Output is correct
32 Correct 3 ms 4444 KB Output is correct
33 Correct 3 ms 4444 KB Output is correct
34 Correct 2 ms 4444 KB Output is correct
35 Correct 2 ms 4468 KB Output is correct
36 Correct 2 ms 4444 KB Output is correct
37 Correct 2 ms 4284 KB Output is correct
38 Correct 2 ms 4444 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 4188 KB Output is correct
2 Correct 2 ms 4188 KB Output is correct
3 Correct 2 ms 4188 KB Output is correct
4 Correct 2 ms 4388 KB Output is correct
5 Correct 2 ms 4188 KB Output is correct
6 Correct 2 ms 4188 KB Output is correct
7 Correct 2 ms 4188 KB Output is correct
8 Correct 2 ms 4188 KB Output is correct
9 Correct 2 ms 4188 KB Output is correct
10 Correct 2 ms 4188 KB Output is correct
11 Correct 2 ms 4188 KB Output is correct
12 Correct 2 ms 4188 KB Output is correct
13 Correct 2 ms 4184 KB Output is correct
14 Correct 2 ms 4324 KB Output is correct
15 Correct 2 ms 4188 KB Output is correct
16 Correct 2 ms 4188 KB Output is correct
17 Correct 2 ms 4148 KB Output is correct
18 Correct 2 ms 4184 KB Output is correct
19 Correct 103 ms 13064 KB Output is correct
20 Correct 89 ms 13252 KB Output is correct
21 Correct 100 ms 13136 KB Output is correct
22 Correct 89 ms 13236 KB Output is correct
23 Correct 53 ms 13404 KB Output is correct
24 Correct 37 ms 13392 KB Output is correct
25 Correct 93 ms 15956 KB Output is correct
26 Correct 74 ms 18892 KB Output is correct
27 Correct 104 ms 22488 KB Output is correct
28 Correct 152 ms 33872 KB Output is correct
29 Correct 162 ms 33104 KB Output is correct
30 Correct 108 ms 22608 KB Output is correct
31 Correct 108 ms 22608 KB Output is correct
32 Correct 126 ms 22612 KB Output is correct
33 Correct 144 ms 21328 KB Output is correct
34 Correct 117 ms 22352 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 4188 KB Output is correct
2 Correct 2 ms 4188 KB Output is correct
3 Correct 2 ms 4188 KB Output is correct
4 Correct 2 ms 4388 KB Output is correct
5 Correct 2 ms 4188 KB Output is correct
6 Correct 2 ms 4188 KB Output is correct
7 Correct 2 ms 4188 KB Output is correct
8 Correct 2 ms 4188 KB Output is correct
9 Correct 2 ms 4188 KB Output is correct
10 Correct 2 ms 4188 KB Output is correct
11 Correct 2 ms 4188 KB Output is correct
12 Correct 2 ms 4188 KB Output is correct
13 Correct 2 ms 4184 KB Output is correct
14 Correct 2 ms 4324 KB Output is correct
15 Correct 2 ms 4188 KB Output is correct
16 Correct 2 ms 4188 KB Output is correct
17 Correct 2 ms 4148 KB Output is correct
18 Correct 2 ms 4184 KB Output is correct
19 Correct 2 ms 4188 KB Output is correct
20 Correct 2 ms 4188 KB Output is correct
21 Correct 3 ms 4444 KB Output is correct
22 Correct 3 ms 4444 KB Output is correct
23 Correct 2 ms 4444 KB Output is correct
24 Correct 2 ms 4444 KB Output is correct
25 Correct 3 ms 4444 KB Output is correct
26 Correct 2 ms 4444 KB Output is correct
27 Correct 2 ms 4444 KB Output is correct
28 Correct 5 ms 4448 KB Output is correct
29 Correct 2 ms 4444 KB Output is correct
30 Correct 3 ms 4444 KB Output is correct
31 Correct 3 ms 4296 KB Output is correct
32 Correct 3 ms 4444 KB Output is correct
33 Correct 3 ms 4444 KB Output is correct
34 Correct 2 ms 4444 KB Output is correct
35 Correct 2 ms 4468 KB Output is correct
36 Correct 2 ms 4444 KB Output is correct
37 Correct 2 ms 4284 KB Output is correct
38 Correct 2 ms 4444 KB Output is correct
39 Correct 103 ms 13064 KB Output is correct
40 Correct 89 ms 13252 KB Output is correct
41 Correct 100 ms 13136 KB Output is correct
42 Correct 89 ms 13236 KB Output is correct
43 Correct 53 ms 13404 KB Output is correct
44 Correct 37 ms 13392 KB Output is correct
45 Correct 93 ms 15956 KB Output is correct
46 Correct 74 ms 18892 KB Output is correct
47 Correct 104 ms 22488 KB Output is correct
48 Correct 152 ms 33872 KB Output is correct
49 Correct 162 ms 33104 KB Output is correct
50 Correct 108 ms 22608 KB Output is correct
51 Correct 108 ms 22608 KB Output is correct
52 Correct 126 ms 22612 KB Output is correct
53 Correct 144 ms 21328 KB Output is correct
54 Correct 117 ms 22352 KB Output is correct
55 Correct 8 ms 5208 KB Output is correct
56 Correct 9 ms 5256 KB Output is correct
57 Correct 53 ms 13404 KB Output is correct
58 Correct 25 ms 13256 KB Output is correct
59 Correct 73 ms 18884 KB Output is correct
60 Correct 297 ms 33204 KB Output is correct
61 Correct 116 ms 22612 KB Output is correct
62 Correct 128 ms 22608 KB Output is correct
63 Correct 166 ms 22612 KB Output is correct
64 Correct 306 ms 22972 KB Output is correct
65 Correct 125 ms 23316 KB Output is correct
66 Correct 249 ms 31056 KB Output is correct
67 Correct 64 ms 23236 KB Output is correct
68 Correct 162 ms 23376 KB Output is correct
69 Correct 149 ms 23560 KB Output is correct
70 Correct 140 ms 22444 KB Output is correct