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답안 #396764

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
396764 2021-04-30T17:40:26 Z IloveN 경주 (Race) (IOI11_race) C++14
100 / 100
 1261 ms 62520 KB 
#include<bits/stdc++.h>

using namespace std;
#define ll long long
#define pii pair<int,int>
#define pll pair<ll,ll>
#define fi first
#define se second
#define mp make_pair
#define pb push_back
#define eb emplace_back
#define all(vr) vr.begin(),vr.end()
#define vi vector<int>
#define vll vector<ll>
const int N = 2e5 + 10;

vector<pii> G[N];
int res, mark[N], sz[N], p[N];

void dfs_cen(int u, int r)
{
    sz[u] = 1;
    for (pii e : G[u])
        if (e.fi != r && !mark[e.fi]) p[e.fi] = u, dfs_cen(e.fi, u), sz[u] += sz[e.fi];
}

int h[N];
ll d[N];

void dfs(int u, int r, vi &vt)
{
    vt.eb(u);
    for (pii e : G[u])
        if (e.fi != r && !mark[e.fi])
        {
            h[e.fi] = h[u] + 1;
            d[e.fi] = d[u] + e.se;
            dfs(e.fi, u, vt);
        }
}

void build_centroid(vi &vt, int K)
{
    int len = vt.size();
    dfs_cen(vt[0], 0);
    int root = vt[0];
    for (int x : vt)
    {
        int mx = len - sz[x];
        for (pii e : G[x])
            if (!mark[e.fi] && e.fi != p[x]) mx = max(mx, sz[e.fi]);
        if (mx <= len / 2) root = x;
    }
    mark[root] = 1;
    vector<vi> vt_sub;
    map<ll,int> best;
    best[0] = 0;
    h[root] = 0;
    for (pii e : G[root])
    if (!mark[e.fi])
    {
        h[e.fi] = 1;
        d[e.fi] = e.se;
        vi s;
        dfs(e.fi, root, s);
        for (int x : s)
            if (d[x] <= K && best.count(K - d[x])) res = min(res, h[x] + best[K - d[x]]);
        for (int x : s)
            if (!best.count(d[x])) best[d[x]] = h[x];
            else best[d[x]] = min(best[d[x]], h[x]);
        vt_sub.eb(s);
    }
    for (vi s : vt_sub) build_centroid(s, K);
}

int best_path(int n, int K, int H[][2], int L[])
{
    for (int i = 1; i <= n; ++i) G[i].clear(), mark[i] = 0;
    for (int i = 0; i < n - 1; ++i)
    {
        int u = H[i][0] + 1;
        int v = H[i][1] + 1;
        int w = L[i];
        G[u].eb(v,w);
        G[v].eb(u,w);
    }
    res = 1e9;
    vi vt;
    for (int i = 1; i <= n; ++i) vt.eb(i);
    build_centroid(vt, K);
    if (res == 1e9) res = -1;
    return res;
}

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 3 ms 4940 KB Output is correct
3 Correct 3 ms 4940 KB Output is correct
4 Correct 3 ms 5000 KB Output is correct
5 Correct 4 ms 4940 KB Output is correct
6 Correct 4 ms 4940 KB Output is correct
7 Correct 3 ms 5000 KB Output is correct
8 Correct 3 ms 5068 KB Output is correct
9 Correct 3 ms 4988 KB Output is correct
10 Correct 3 ms 5068 KB Output is correct
11 Correct 3 ms 5004 KB Output is correct
12 Correct 4 ms 5068 KB Output is correct
13 Correct 4 ms 4940 KB Output is correct
14 Correct 3 ms 5068 KB Output is correct
15 Correct 3 ms 4940 KB Output is correct
16 Correct 3 ms 5000 KB Output is correct
17 Correct 3 ms 4992 KB Output is correct
18 Correct 3 ms 4940 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 3 ms 4940 KB Output is correct
3 Correct 3 ms 4940 KB Output is correct
4 Correct 3 ms 5000 KB Output is correct
5 Correct 4 ms 4940 KB Output is correct
6 Correct 4 ms 4940 KB Output is correct
7 Correct 3 ms 5000 KB Output is correct
8 Correct 3 ms 5068 KB Output is correct
9 Correct 3 ms 4988 KB Output is correct
10 Correct 3 ms 5068 KB Output is correct
11 Correct 3 ms 5004 KB Output is correct
12 Correct 4 ms 5068 KB Output is correct
13 Correct 4 ms 4940 KB Output is correct
14 Correct 3 ms 5068 KB Output is correct
15 Correct 3 ms 4940 KB Output is correct
16 Correct 3 ms 5000 KB Output is correct
17 Correct 3 ms 4992 KB Output is correct
18 Correct 3 ms 4940 KB Output is correct
19 Correct 3 ms 4940 KB Output is correct
20 Correct 3 ms 4940 KB Output is correct
21 Correct 5 ms 5068 KB Output is correct
22 Correct 6 ms 5196 KB Output is correct
23 Correct 6 ms 5272 KB Output is correct
24 Correct 5 ms 5208 KB Output is correct
25 Correct 5 ms 5196 KB Output is correct
26 Correct 5 ms 5196 KB Output is correct
27 Correct 5 ms 5068 KB Output is correct
28 Correct 5 ms 5196 KB Output is correct
29 Correct 5 ms 5196 KB Output is correct
30 Correct 5 ms 5144 KB Output is correct
31 Correct 5 ms 5196 KB Output is correct
32 Correct 5 ms 5196 KB Output is correct
33 Correct 6 ms 5196 KB Output is correct
34 Correct 5 ms 5196 KB Output is correct
35 Correct 6 ms 5260 KB Output is correct
36 Correct 5 ms 5132 KB Output is correct
37 Correct 6 ms 5196 KB Output is correct
38 Correct 5 ms 5196 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 3 ms 4940 KB Output is correct
3 Correct 3 ms 4940 KB Output is correct
4 Correct 3 ms 5000 KB Output is correct
5 Correct 4 ms 4940 KB Output is correct
6 Correct 4 ms 4940 KB Output is correct
7 Correct 3 ms 5000 KB Output is correct
8 Correct 3 ms 5068 KB Output is correct
9 Correct 3 ms 4988 KB Output is correct
10 Correct 3 ms 5068 KB Output is correct
11 Correct 3 ms 5004 KB Output is correct
12 Correct 4 ms 5068 KB Output is correct
13 Correct 4 ms 4940 KB Output is correct
14 Correct 3 ms 5068 KB Output is correct
15 Correct 3 ms 4940 KB Output is correct
16 Correct 3 ms 5000 KB Output is correct
17 Correct 3 ms 4992 KB Output is correct
18 Correct 3 ms 4940 KB Output is correct
19 Correct 395 ms 14332 KB Output is correct
20 Correct 370 ms 14528 KB Output is correct
21 Correct 366 ms 14488 KB Output is correct
22 Correct 363 ms 14472 KB Output is correct
23 Correct 466 ms 14664 KB Output is correct
24 Correct 198 ms 14028 KB Output is correct
25 Correct 315 ms 18768 KB Output is correct
26 Correct 155 ms 21820 KB Output is correct
27 Correct 418 ms 22232 KB Output is correct
28 Correct 1183 ms 62520 KB Output is correct
29 Correct 1153 ms 61360 KB Output is correct
30 Correct 410 ms 22220 KB Output is correct
31 Correct 464 ms 22204 KB Output is correct
32 Correct 494 ms 22156 KB Output is correct
33 Correct 734 ms 22816 KB Output is correct
34 Correct 1054 ms 43968 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 3 ms 4940 KB Output is correct
3 Correct 3 ms 4940 KB Output is correct
4 Correct 3 ms 5000 KB Output is correct
5 Correct 4 ms 4940 KB Output is correct
6 Correct 4 ms 4940 KB Output is correct
7 Correct 3 ms 5000 KB Output is correct
8 Correct 3 ms 5068 KB Output is correct
9 Correct 3 ms 4988 KB Output is correct
10 Correct 3 ms 5068 KB Output is correct
11 Correct 3 ms 5004 KB Output is correct
12 Correct 4 ms 5068 KB Output is correct
13 Correct 4 ms 4940 KB Output is correct
14 Correct 3 ms 5068 KB Output is correct
15 Correct 3 ms 4940 KB Output is correct
16 Correct 3 ms 5000 KB Output is correct
17 Correct 3 ms 4992 KB Output is correct
18 Correct 3 ms 4940 KB Output is correct
19 Correct 3 ms 4940 KB Output is correct
20 Correct 3 ms 4940 KB Output is correct
21 Correct 5 ms 5068 KB Output is correct
22 Correct 6 ms 5196 KB Output is correct
23 Correct 6 ms 5272 KB Output is correct
24 Correct 5 ms 5208 KB Output is correct
25 Correct 5 ms 5196 KB Output is correct
26 Correct 5 ms 5196 KB Output is correct
27 Correct 5 ms 5068 KB Output is correct
28 Correct 5 ms 5196 KB Output is correct
29 Correct 5 ms 5196 KB Output is correct
30 Correct 5 ms 5144 KB Output is correct
31 Correct 5 ms 5196 KB Output is correct
32 Correct 5 ms 5196 KB Output is correct
33 Correct 6 ms 5196 KB Output is correct
34 Correct 5 ms 5196 KB Output is correct
35 Correct 6 ms 5260 KB Output is correct
36 Correct 5 ms 5132 KB Output is correct
37 Correct 6 ms 5196 KB Output is correct
38 Correct 5 ms 5196 KB Output is correct
39 Correct 395 ms 14332 KB Output is correct
40 Correct 370 ms 14528 KB Output is correct
41 Correct 366 ms 14488 KB Output is correct
42 Correct 363 ms 14472 KB Output is correct
43 Correct 466 ms 14664 KB Output is correct
44 Correct 198 ms 14028 KB Output is correct
45 Correct 315 ms 18768 KB Output is correct
46 Correct 155 ms 21820 KB Output is correct
47 Correct 418 ms 22232 KB Output is correct
48 Correct 1183 ms 62520 KB Output is correct
49 Correct 1153 ms 61360 KB Output is correct
50 Correct 410 ms 22220 KB Output is correct
51 Correct 464 ms 22204 KB Output is correct
52 Correct 494 ms 22156 KB Output is correct
53 Correct 734 ms 22816 KB Output is correct
54 Correct 1054 ms 43968 KB Output is correct
55 Correct 33 ms 6788 KB Output is correct
56 Correct 25 ms 5964 KB Output is correct
57 Correct 203 ms 14400 KB Output is correct
58 Correct 74 ms 18988 KB Output is correct
59 Correct 412 ms 31000 KB Output is correct
60 Correct 1261 ms 62096 KB Output is correct
61 Correct 469 ms 26404 KB Output is correct
62 Correct 401 ms 24592 KB Output is correct
63 Correct 523 ms 24640 KB Output is correct
64 Correct 1236 ms 40552 KB Output is correct
65 Correct 1032 ms 47964 KB Output is correct
66 Correct 1213 ms 61544 KB Output is correct
67 Correct 235 ms 34776 KB Output is correct
68 Correct 655 ms 41376 KB Output is correct
69 Correct 656 ms 42108 KB Output is correct
70 Correct 612 ms 39988 KB Output is correct