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답안 #953382

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
953382 2024-03-25T23:43:46 Z efishel 경주 (Race) (IOI11_race) C++17
100 / 100
 296 ms 74580 KB 
#include "race.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vll = vector <ll>;

const ll MAXN = 1E6+16;
vector <pair <ll, ll> > adj[MAXN];
vector <char> used(MAXN, false);
vll sz(MAXN);

ll dfs_subsz (ll u, ll par) {
    sz[u] = 1;
    for (auto [v, w] : adj[u]) {
        if (v == par) continue;
        if (used[v]) continue;
        sz[u] += dfs_subsz(v, u);
    }
    return sz[u];
}

ll dfs_ctd (ll u, ll par, ll n) {
    for (auto [v, w] : adj[u]) {
        if (v == par) continue;
        if (used[v]) continue;
        if (sz[v] > n/2) return dfs_ctd(v, u, n);
    }
    return u;
}

vll freq(MAXN, MAXN);
vll vis(MAXN, 0);
ll timer = 1;
void sett (ll dis, ll dep) {
    if (vis[dis] != timer) { freq[dis] = MAXN; vis[dis] = timer; }
    freq[dis] = min(freq[dis], dep);
}
ll get (ll dis) {
    if (0 <= dis && dis < MAXN-8 && vis[dis] == timer) return freq[dis];
    return MAXN;
}
ll k;
ll ans = MAXN;

void dfs_calc (ll u, ll par, ll dis, ll dep) {
    if (dis > k) return;
    ans = min(ans, get(k-dis)+dep);
    for (auto [v, w] : adj[u]) {
        if (v == par) continue;
        if (used[v]) continue;
        dfs_calc(v, u, dis+w, dep+1);
    }
}

void dfs_dis (ll u, ll par, ll dis, ll dep) {
    if (dis > k) return;
    sett(dis, dep);
    for (auto [v, w] : adj[u]) {
        if (v == par) continue;
        if (used[v]) continue;
        dfs_dis(v, u, dis+w, dep+1);
    }
}

void solve (ll u) {
    ll n = dfs_subsz(u, u);
    ll ctd = dfs_ctd(u, u, n);
    used[ctd] = true;
    timer++;
    sett(0, 0);
    for (auto [v, w] : adj[ctd]) {
        if (used[v]) continue;
        dfs_calc(v, ctd, w, 1);
        dfs_dis(v, ctd, w, 1);
    }
    for (auto [v, w] : adj[ctd]) {
        if (used[v]) continue;
        solve(v);
    }
}

int best_path(int N, int K, int H[][2], int L[]) {
    ll n = N;
    k = K;
    for (ll i = 0; i < n-1; i++) {
        ll u = H[i][0], v = H[i][1];
        ll w = L[i];
        adj[u].push_back({ v, w });
        adj[v].push_back({ u, w });
    }
    solve(0);
    return (ans == MAXN ? -1 : ans);
}

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 28 ms 51788 KB Output is correct
2 Correct 16 ms 52060 KB Output is correct
3 Correct 12 ms 51804 KB Output is correct
4 Correct 11 ms 51804 KB Output is correct
5 Correct 12 ms 51804 KB Output is correct
6 Correct 12 ms 51960 KB Output is correct
7 Correct 12 ms 51800 KB Output is correct
8 Correct 11 ms 51804 KB Output is correct
9 Correct 11 ms 52060 KB Output is correct
10 Correct 13 ms 52060 KB Output is correct
11 Correct 11 ms 52212 KB Output is correct
12 Correct 12 ms 52056 KB Output is correct
13 Correct 12 ms 52060 KB Output is correct
14 Correct 11 ms 51800 KB Output is correct
15 Correct 11 ms 52060 KB Output is correct
16 Correct 12 ms 51904 KB Output is correct
17 Correct 12 ms 51804 KB Output is correct
18 Correct 12 ms 52056 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 28 ms 51788 KB Output is correct
2 Correct 16 ms 52060 KB Output is correct
3 Correct 12 ms 51804 KB Output is correct
4 Correct 11 ms 51804 KB Output is correct
5 Correct 12 ms 51804 KB Output is correct
6 Correct 12 ms 51960 KB Output is correct
7 Correct 12 ms 51800 KB Output is correct
8 Correct 11 ms 51804 KB Output is correct
9 Correct 11 ms 52060 KB Output is correct
10 Correct 13 ms 52060 KB Output is correct
11 Correct 11 ms 52212 KB Output is correct
12 Correct 12 ms 52056 KB Output is correct
13 Correct 12 ms 52060 KB Output is correct
14 Correct 11 ms 51800 KB Output is correct
15 Correct 11 ms 52060 KB Output is correct
16 Correct 12 ms 51904 KB Output is correct
17 Correct 12 ms 51804 KB Output is correct
18 Correct 12 ms 52056 KB Output is correct
19 Correct 11 ms 51804 KB Output is correct
20 Correct 11 ms 52060 KB Output is correct
21 Correct 13 ms 52060 KB Output is correct
22 Correct 12 ms 52060 KB Output is correct
23 Correct 12 ms 52060 KB Output is correct
24 Correct 13 ms 52060 KB Output is correct
25 Correct 12 ms 52060 KB Output is correct
26 Correct 12 ms 52060 KB Output is correct
27 Correct 12 ms 52056 KB Output is correct
28 Correct 12 ms 52056 KB Output is correct
29 Correct 13 ms 52056 KB Output is correct
30 Correct 12 ms 51904 KB Output is correct
31 Correct 13 ms 52060 KB Output is correct
32 Correct 12 ms 52060 KB Output is correct
33 Correct 12 ms 52056 KB Output is correct
34 Correct 12 ms 52056 KB Output is correct
35 Correct 13 ms 52060 KB Output is correct
36 Correct 14 ms 52056 KB Output is correct
37 Correct 12 ms 52060 KB Output is correct
38 Correct 12 ms 52060 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 28 ms 51788 KB Output is correct
2 Correct 16 ms 52060 KB Output is correct
3 Correct 12 ms 51804 KB Output is correct
4 Correct 11 ms 51804 KB Output is correct
5 Correct 12 ms 51804 KB Output is correct
6 Correct 12 ms 51960 KB Output is correct
7 Correct 12 ms 51800 KB Output is correct
8 Correct 11 ms 51804 KB Output is correct
9 Correct 11 ms 52060 KB Output is correct
10 Correct 13 ms 52060 KB Output is correct
11 Correct 11 ms 52212 KB Output is correct
12 Correct 12 ms 52056 KB Output is correct
13 Correct 12 ms 52060 KB Output is correct
14 Correct 11 ms 51800 KB Output is correct
15 Correct 11 ms 52060 KB Output is correct
16 Correct 12 ms 51904 KB Output is correct
17 Correct 12 ms 51804 KB Output is correct
18 Correct 12 ms 52056 KB Output is correct
19 Correct 85 ms 59352 KB Output is correct
20 Correct 87 ms 60428 KB Output is correct
21 Correct 98 ms 59988 KB Output is correct
22 Correct 90 ms 60736 KB Output is correct
23 Correct 58 ms 61012 KB Output is correct
24 Correct 49 ms 60240 KB Output is correct
25 Correct 89 ms 62548 KB Output is correct
26 Correct 73 ms 64336 KB Output is correct
27 Correct 129 ms 66384 KB Output is correct
28 Correct 177 ms 74580 KB Output is correct
29 Correct 166 ms 74320 KB Output is correct
30 Correct 117 ms 66936 KB Output is correct
31 Correct 126 ms 67156 KB Output is correct
32 Correct 138 ms 66900 KB Output is correct
33 Correct 149 ms 66156 KB Output is correct
34 Correct 122 ms 66268 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 28 ms 51788 KB Output is correct
2 Correct 16 ms 52060 KB Output is correct
3 Correct 12 ms 51804 KB Output is correct
4 Correct 11 ms 51804 KB Output is correct
5 Correct 12 ms 51804 KB Output is correct
6 Correct 12 ms 51960 KB Output is correct
7 Correct 12 ms 51800 KB Output is correct
8 Correct 11 ms 51804 KB Output is correct
9 Correct 11 ms 52060 KB Output is correct
10 Correct 13 ms 52060 KB Output is correct
11 Correct 11 ms 52212 KB Output is correct
12 Correct 12 ms 52056 KB Output is correct
13 Correct 12 ms 52060 KB Output is correct
14 Correct 11 ms 51800 KB Output is correct
15 Correct 11 ms 52060 KB Output is correct
16 Correct 12 ms 51904 KB Output is correct
17 Correct 12 ms 51804 KB Output is correct
18 Correct 12 ms 52056 KB Output is correct
19 Correct 11 ms 51804 KB Output is correct
20 Correct 11 ms 52060 KB Output is correct
21 Correct 13 ms 52060 KB Output is correct
22 Correct 12 ms 52060 KB Output is correct
23 Correct 12 ms 52060 KB Output is correct
24 Correct 13 ms 52060 KB Output is correct
25 Correct 12 ms 52060 KB Output is correct
26 Correct 12 ms 52060 KB Output is correct
27 Correct 12 ms 52056 KB Output is correct
28 Correct 12 ms 52056 KB Output is correct
29 Correct 13 ms 52056 KB Output is correct
30 Correct 12 ms 51904 KB Output is correct
31 Correct 13 ms 52060 KB Output is correct
32 Correct 12 ms 52060 KB Output is correct
33 Correct 12 ms 52056 KB Output is correct
34 Correct 12 ms 52056 KB Output is correct
35 Correct 13 ms 52060 KB Output is correct
36 Correct 14 ms 52056 KB Output is correct
37 Correct 12 ms 52060 KB Output is correct
38 Correct 12 ms 52060 KB Output is correct
39 Correct 85 ms 59352 KB Output is correct
40 Correct 87 ms 60428 KB Output is correct
41 Correct 98 ms 59988 KB Output is correct
42 Correct 90 ms 60736 KB Output is correct
43 Correct 58 ms 61012 KB Output is correct
44 Correct 49 ms 60240 KB Output is correct
45 Correct 89 ms 62548 KB Output is correct
46 Correct 73 ms 64336 KB Output is correct
47 Correct 129 ms 66384 KB Output is correct
48 Correct 177 ms 74580 KB Output is correct
49 Correct 166 ms 74320 KB Output is correct
50 Correct 117 ms 66936 KB Output is correct
51 Correct 126 ms 67156 KB Output is correct
52 Correct 138 ms 66900 KB Output is correct
53 Correct 149 ms 66156 KB Output is correct
54 Correct 122 ms 66268 KB Output is correct
55 Correct 18 ms 52568 KB Output is correct
56 Correct 18 ms 52568 KB Output is correct
57 Correct 63 ms 59732 KB Output is correct
58 Correct 43 ms 60096 KB Output is correct
59 Correct 74 ms 64340 KB Output is correct
60 Correct 275 ms 74352 KB Output is correct
61 Correct 127 ms 66388 KB Output is correct
62 Correct 138 ms 66892 KB Output is correct
63 Correct 169 ms 66900 KB Output is correct
64 Correct 296 ms 65440 KB Output is correct
65 Correct 140 ms 67664 KB Output is correct
66 Correct 282 ms 70740 KB Output is correct
67 Correct 83 ms 67392 KB Output is correct
68 Correct 166 ms 66896 KB Output is correct
69 Correct 177 ms 64336 KB Output is correct
70 Correct 163 ms 66644 KB Output is correct