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답안 #539405

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
539405 2022-03-18T20:05:07 Z noedit 경주 (Race) (IOI11_race) C++17
100 / 100
 995 ms 91652 KB 
#include <bits/stdc++.h>
#include "race.h"

using namespace std;
typedef long long ll;

const int MAXN = 2e5;
const int MAXK = 1e6 + 1;
vector<pair<ll, ll> > g[MAXN];
vector<ll>* vec[MAXN];

ll sz[MAXN], big[MAXN];
//map<ll, ll> cnt[MAXK];
map<ll, map<ll, ll> > cnt;
ll dep[MAXN];
ll d[MAXN];
void sizes(ll v, ll p, ll depth = 0, ll dist = 0)
{
    dep[v] = depth;
    d[v] = dist;
    sz[v] = 1;
    ll b = -1, mx = 0;
    for (auto& [u, w]: g[v])
    {
        if (u != p)
        {
            sizes(u, v, depth + 1, dist + w);
            sz[v] += sz[u];
            if (sz[u] > mx)
            {
                mx = sz[u];
                b = u;
            }
        }
    }
    big[v] = b;
}

ll ans = 1e9, k, n;

void dfs(ll v, ll p, bool keep = 0)
{
    for (auto& [u, w] : g[v])
    {
        if (u != p && u != big[v])
        {
            dfs(u, v, 0);
        }
    }
    if (big[v] != -1)
    {
        dfs(big[v], v, 1);
        vec[v] = vec[big[v]];
    }
    else
    {
        vec[v] = new vector<ll>();
    }
    vec[v]->push_back(v);
    ll y = k + d[v];
    if (cnt.count(y) && cnt[y].size() > 0 && cnt[y].begin()->first - dep[v] < ans)
    {
        ans = cnt[y].begin()->first - dep[v];
    }
        cnt[d[v]][dep[v]]++;
    for (auto& [u, w] : g[v])
    {
        if (u != p && u != big[v])
        {
            for (auto& w : *vec[u])
            {
                ll x = k * 1ll + 2 * 1ll * d[v] - d[w];
                if (cnt.count(x) && cnt[x].size() > 0)
                {
                    ll cur = cnt[x].begin()->first + dep[w];
                    if (cur - 2 * 1ll * dep[v] < ans)
                    {
                        ans = cur - 2 * 1ll * dep[v];
                    }
                }
                vec[v]->push_back(w);
            }
            for (auto& w : *vec[u])
                cnt[d[w]][dep[w]]++;
        }
    }
    if (!keep)
    {
        for (auto& u : *vec[v])
        {
            cnt[d[u]][dep[u]]--;
            if (cnt[d[u]][dep[u]] == 0)
                cnt[d[u]].erase(dep[u]);
            if (cnt[d[u]].empty())
                cnt.erase(d[u]);
        }
    }
}

int best_path(int N, int K, int H[][2], int L[])
{
    n = N, k = K;
    for (int i = 0; i < n - 1; i++)
    {
        int x = H[i][0], y = H[i][1], z = L[i];
        g[x].push_back({y, z});
        g[y].push_back({x, z});
    }
    sizes(0, 0);
    dfs(0, 0);
    return (ans == 1e9 ? -1 :ans);
}

/*
4 3
0 1 1
1 2 2
1 3 4
2

*/

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5076 KB Output is correct
2 Correct 3 ms 5076 KB Output is correct
3 Correct 3 ms 5076 KB Output is correct
4 Correct 3 ms 5076 KB Output is correct
5 Correct 3 ms 5076 KB Output is correct
6 Correct 2 ms 5076 KB Output is correct
7 Correct 2 ms 5076 KB Output is correct
8 Correct 3 ms 5076 KB Output is correct
9 Correct 3 ms 5076 KB Output is correct
10 Correct 4 ms 5076 KB Output is correct
11 Correct 3 ms 5076 KB Output is correct
12 Correct 3 ms 5076 KB Output is correct
13 Correct 3 ms 5076 KB Output is correct
14 Correct 3 ms 5076 KB Output is correct
15 Correct 3 ms 5076 KB Output is correct
16 Correct 3 ms 5004 KB Output is correct
17 Correct 3 ms 5076 KB Output is correct
18 Correct 3 ms 5076 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5076 KB Output is correct
2 Correct 3 ms 5076 KB Output is correct
3 Correct 3 ms 5076 KB Output is correct
4 Correct 3 ms 5076 KB Output is correct
5 Correct 3 ms 5076 KB Output is correct
6 Correct 2 ms 5076 KB Output is correct
7 Correct 2 ms 5076 KB Output is correct
8 Correct 3 ms 5076 KB Output is correct
9 Correct 3 ms 5076 KB Output is correct
10 Correct 4 ms 5076 KB Output is correct
11 Correct 3 ms 5076 KB Output is correct
12 Correct 3 ms 5076 KB Output is correct
13 Correct 3 ms 5076 KB Output is correct
14 Correct 3 ms 5076 KB Output is correct
15 Correct 3 ms 5076 KB Output is correct
16 Correct 3 ms 5004 KB Output is correct
17 Correct 3 ms 5076 KB Output is correct
18 Correct 3 ms 5076 KB Output is correct
19 Correct 3 ms 4948 KB Output is correct
20 Correct 3 ms 4992 KB Output is correct
21 Correct 5 ms 5252 KB Output is correct
22 Correct 4 ms 5332 KB Output is correct
23 Correct 4 ms 5332 KB Output is correct
24 Correct 4 ms 5332 KB Output is correct
25 Correct 4 ms 5284 KB Output is correct
26 Correct 5 ms 5332 KB Output is correct
27 Correct 4 ms 5204 KB Output is correct
28 Correct 5 ms 5332 KB Output is correct
29 Correct 4 ms 5332 KB Output is correct
30 Correct 5 ms 5332 KB Output is correct
31 Correct 4 ms 5332 KB Output is correct
32 Correct 5 ms 5332 KB Output is correct
33 Correct 5 ms 5332 KB Output is correct
34 Correct 4 ms 5332 KB Output is correct
35 Correct 4 ms 5276 KB Output is correct
36 Correct 4 ms 5280 KB Output is correct
37 Correct 4 ms 5204 KB Output is correct
38 Correct 4 ms 5332 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5076 KB Output is correct
2 Correct 3 ms 5076 KB Output is correct
3 Correct 3 ms 5076 KB Output is correct
4 Correct 3 ms 5076 KB Output is correct
5 Correct 3 ms 5076 KB Output is correct
6 Correct 2 ms 5076 KB Output is correct
7 Correct 2 ms 5076 KB Output is correct
8 Correct 3 ms 5076 KB Output is correct
9 Correct 3 ms 5076 KB Output is correct
10 Correct 4 ms 5076 KB Output is correct
11 Correct 3 ms 5076 KB Output is correct
12 Correct 3 ms 5076 KB Output is correct
13 Correct 3 ms 5076 KB Output is correct
14 Correct 3 ms 5076 KB Output is correct
15 Correct 3 ms 5076 KB Output is correct
16 Correct 3 ms 5004 KB Output is correct
17 Correct 3 ms 5076 KB Output is correct
18 Correct 3 ms 5076 KB Output is correct
19 Correct 237 ms 23180 KB Output is correct
20 Correct 246 ms 24352 KB Output is correct
21 Correct 233 ms 24736 KB Output is correct
22 Correct 222 ms 24396 KB Output is correct
23 Correct 401 ms 26500 KB Output is correct
24 Correct 219 ms 26228 KB Output is correct
25 Correct 119 ms 32324 KB Output is correct
26 Correct 76 ms 38900 KB Output is correct
27 Correct 265 ms 42060 KB Output is correct
28 Correct 321 ms 91652 KB Output is correct
29 Correct 323 ms 89512 KB Output is correct
30 Correct 263 ms 42040 KB Output is correct
31 Correct 287 ms 41984 KB Output is correct
32 Correct 377 ms 42180 KB Output is correct
33 Correct 312 ms 36548 KB Output is correct
34 Correct 695 ms 66332 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5076 KB Output is correct
2 Correct 3 ms 5076 KB Output is correct
3 Correct 3 ms 5076 KB Output is correct
4 Correct 3 ms 5076 KB Output is correct
5 Correct 3 ms 5076 KB Output is correct
6 Correct 2 ms 5076 KB Output is correct
7 Correct 2 ms 5076 KB Output is correct
8 Correct 3 ms 5076 KB Output is correct
9 Correct 3 ms 5076 KB Output is correct
10 Correct 4 ms 5076 KB Output is correct
11 Correct 3 ms 5076 KB Output is correct
12 Correct 3 ms 5076 KB Output is correct
13 Correct 3 ms 5076 KB Output is correct
14 Correct 3 ms 5076 KB Output is correct
15 Correct 3 ms 5076 KB Output is correct
16 Correct 3 ms 5004 KB Output is correct
17 Correct 3 ms 5076 KB Output is correct
18 Correct 3 ms 5076 KB Output is correct
19 Correct 3 ms 4948 KB Output is correct
20 Correct 3 ms 4992 KB Output is correct
21 Correct 5 ms 5252 KB Output is correct
22 Correct 4 ms 5332 KB Output is correct
23 Correct 4 ms 5332 KB Output is correct
24 Correct 4 ms 5332 KB Output is correct
25 Correct 4 ms 5284 KB Output is correct
26 Correct 5 ms 5332 KB Output is correct
27 Correct 4 ms 5204 KB Output is correct
28 Correct 5 ms 5332 KB Output is correct
29 Correct 4 ms 5332 KB Output is correct
30 Correct 5 ms 5332 KB Output is correct
31 Correct 4 ms 5332 KB Output is correct
32 Correct 5 ms 5332 KB Output is correct
33 Correct 5 ms 5332 KB Output is correct
34 Correct 4 ms 5332 KB Output is correct
35 Correct 4 ms 5276 KB Output is correct
36 Correct 4 ms 5280 KB Output is correct
37 Correct 4 ms 5204 KB Output is correct
38 Correct 4 ms 5332 KB Output is correct
39 Correct 237 ms 23180 KB Output is correct
40 Correct 246 ms 24352 KB Output is correct
41 Correct 233 ms 24736 KB Output is correct
42 Correct 222 ms 24396 KB Output is correct
43 Correct 401 ms 26500 KB Output is correct
44 Correct 219 ms 26228 KB Output is correct
45 Correct 119 ms 32324 KB Output is correct
46 Correct 76 ms 38900 KB Output is correct
47 Correct 265 ms 42060 KB Output is correct
48 Correct 321 ms 91652 KB Output is correct
49 Correct 323 ms 89512 KB Output is correct
50 Correct 263 ms 42040 KB Output is correct
51 Correct 287 ms 41984 KB Output is correct
52 Correct 377 ms 42180 KB Output is correct
53 Correct 312 ms 36548 KB Output is correct
54 Correct 695 ms 66332 KB Output is correct
55 Correct 27 ms 7960 KB Output is correct
56 Correct 15 ms 6868 KB Output is correct
57 Correct 149 ms 26352 KB Output is correct
58 Correct 68 ms 23856 KB Output is correct
59 Correct 106 ms 48192 KB Output is correct
60 Correct 314 ms 90012 KB Output is correct
61 Correct 410 ms 48644 KB Output is correct
62 Correct 284 ms 42128 KB Output is correct
63 Correct 339 ms 42252 KB Output is correct
64 Correct 989 ms 65300 KB Output is correct
65 Correct 995 ms 75496 KB Output is correct
66 Correct 334 ms 84748 KB Output is correct
67 Correct 228 ms 43856 KB Output is correct
68 Correct 611 ms 68924 KB Output is correct
69 Correct 661 ms 69276 KB Output is correct
70 Correct 668 ms 66076 KB Output is correct