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답안 #461182

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
461182 2021-08-09T13:32:24 Z KazamaHoang 경주 (Race) (IOI11_race) C++14
100 / 100
 638 ms 34036 KB 
#include <bits/stdc++.h>
#define F first
#define S second
#define eb emplace_back
#define bit(x, i) (((x) >> (i)) & 1)

using namespace std;
using ll = long long;

const int inf = 1061109567;
const ll INF = 4557430888798830399;
const int MOD = 998244353;

int n, lenRace;
vector <pair <int, int>> adj[200005];
int subtree_size[200005];
int minDepth[1000005];
bool vis[200005];
int res = inf;

int dfs(int u, int par) {
    int &ret = subtree_size[u];
    ret = 1;
    for (auto pii : adj[u]) {
        int v = pii.F;
        if (v != par && !vis[v])
            ret += dfs(v, u);
    }
    return ret;
}

int find_centroid(int u, int par, int sz) {
    for (auto pii : adj[u]) {
        int v = pii.F;
        if (v != par && !vis[v] && subtree_size[v] * 2 > sz)
            return find_centroid(v, u, sz);
    }
    return u;
}

void calc(int u, int par, int sign, int depth, int len) {
    if (len > lenRace)
        return;
    if (sign == 0)
        res = min(res, depth + minDepth[lenRace-len]);
    else if (sign == 1)
        minDepth[len] = min(minDepth[len], depth);
    else
        minDepth[len] = inf;
    for (auto pii : adj[u]) {
        int v = pii.F;
        int w = pii.S;
        if (!vis[v] && v != par)
            calc(v, u, sign, depth + 1, len + w);
    }
}

void process(int u) {
    int centroid = find_centroid(u, -1, dfs(u, -1));
    vis[centroid] = true;

    for (auto pii : adj[centroid]) {
        int v = pii.F, w = pii.S;
        if (vis[v])
            continue;
        calc(v, centroid, 0, 1, w);
        calc(v, centroid, 1, 1, w);
    }
    for (auto pii : adj[centroid]) {
        int v = pii.F;
        int w = pii.S;
        if (vis[v])
            continue;
        calc(v, centroid, -1, 1, w);
    }

    for (auto pii : adj[centroid]) {
        int v = pii.F;
        if (vis[v])
            continue;
        process(v);
    }
}

int best_path(int N, int K, int h[][2], int L[]) {
    n = N;
    lenRace = K;
    for (int i = 0; i < n - 1; ++ i) {
        int u = h[i][0] + 1;
        int v = h[i][1] + 1;
        adj[u].eb(v, L[i]);
        adj[v].eb(u, L[i]);
    }
    for (int i = 1; i <= 1e6; ++ i)
        minDepth[i] = inf;
    process(1);
    if (res == inf)
        res = -1;
    return res;
}

//int32_t main(void) {
//    cin.tie(0)->sync_with_stdio(0);
//    if (fopen(".in", "r")) {
//        freopen(".in", "r", stdin);
//        freopen(".out", "w", stdout);
//    }
//    cin >> n >> lenRace;
//    for (int i = 1; i < n; ++ i) {
//        int u, v, w; cin >> u >> v >> w;
//        ++ u, ++ v;
//        adj[u].eb(v, w);
//        adj[v].eb(u, w);
//    }
//    for (int i = 1; i <= 1e6; ++ i)
//        minDepth[i] = inf;
//    process(1);
//    if (res == inf)
//        res = -1;
//    cout << res;
//    return 0;
//}

// Written by Kazama Hoang ^^

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 8908 KB Output is correct
2 Correct 6 ms 8908 KB Output is correct
3 Correct 6 ms 8840 KB Output is correct
4 Correct 5 ms 8836 KB Output is correct
5 Correct 5 ms 8908 KB Output is correct
6 Correct 5 ms 8908 KB Output is correct
7 Correct 5 ms 8840 KB Output is correct
8 Correct 5 ms 8840 KB Output is correct
9 Correct 5 ms 8908 KB Output is correct
10 Correct 5 ms 8908 KB Output is correct
11 Correct 5 ms 8908 KB Output is correct
12 Correct 5 ms 8908 KB Output is correct
13 Correct 5 ms 8908 KB Output is correct
14 Correct 5 ms 8908 KB Output is correct
15 Correct 5 ms 8908 KB Output is correct
16 Correct 5 ms 8844 KB Output is correct
17 Correct 5 ms 8836 KB Output is correct
18 Correct 5 ms 8908 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 8908 KB Output is correct
2 Correct 6 ms 8908 KB Output is correct
3 Correct 6 ms 8840 KB Output is correct
4 Correct 5 ms 8836 KB Output is correct
5 Correct 5 ms 8908 KB Output is correct
6 Correct 5 ms 8908 KB Output is correct
7 Correct 5 ms 8840 KB Output is correct
8 Correct 5 ms 8840 KB Output is correct
9 Correct 5 ms 8908 KB Output is correct
10 Correct 5 ms 8908 KB Output is correct
11 Correct 5 ms 8908 KB Output is correct
12 Correct 5 ms 8908 KB Output is correct
13 Correct 5 ms 8908 KB Output is correct
14 Correct 5 ms 8908 KB Output is correct
15 Correct 5 ms 8908 KB Output is correct
16 Correct 5 ms 8844 KB Output is correct
17 Correct 5 ms 8836 KB Output is correct
18 Correct 5 ms 8908 KB Output is correct
19 Correct 6 ms 8908 KB Output is correct
20 Correct 5 ms 8908 KB Output is correct
21 Correct 5 ms 8908 KB Output is correct
22 Correct 6 ms 8908 KB Output is correct
23 Correct 6 ms 8908 KB Output is correct
24 Correct 6 ms 8960 KB Output is correct
25 Correct 6 ms 8908 KB Output is correct
26 Correct 7 ms 8980 KB Output is correct
27 Correct 6 ms 8908 KB Output is correct
28 Correct 6 ms 8908 KB Output is correct
29 Correct 6 ms 8908 KB Output is correct
30 Correct 7 ms 8908 KB Output is correct
31 Correct 6 ms 8908 KB Output is correct
32 Correct 6 ms 8984 KB Output is correct
33 Correct 7 ms 8908 KB Output is correct
34 Correct 7 ms 8976 KB Output is correct
35 Correct 6 ms 8908 KB Output is correct
36 Correct 6 ms 8908 KB Output is correct
37 Correct 6 ms 8972 KB Output is correct
38 Correct 6 ms 8908 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 8908 KB Output is correct
2 Correct 6 ms 8908 KB Output is correct
3 Correct 6 ms 8840 KB Output is correct
4 Correct 5 ms 8836 KB Output is correct
5 Correct 5 ms 8908 KB Output is correct
6 Correct 5 ms 8908 KB Output is correct
7 Correct 5 ms 8840 KB Output is correct
8 Correct 5 ms 8840 KB Output is correct
9 Correct 5 ms 8908 KB Output is correct
10 Correct 5 ms 8908 KB Output is correct
11 Correct 5 ms 8908 KB Output is correct
12 Correct 5 ms 8908 KB Output is correct
13 Correct 5 ms 8908 KB Output is correct
14 Correct 5 ms 8908 KB Output is correct
15 Correct 5 ms 8908 KB Output is correct
16 Correct 5 ms 8844 KB Output is correct
17 Correct 5 ms 8836 KB Output is correct
18 Correct 5 ms 8908 KB Output is correct
19 Correct 147 ms 15492 KB Output is correct
20 Correct 147 ms 15572 KB Output is correct
21 Correct 195 ms 15612 KB Output is correct
22 Correct 156 ms 15752 KB Output is correct
23 Correct 92 ms 15884 KB Output is correct
24 Correct 65 ms 15760 KB Output is correct
25 Correct 147 ms 18244 KB Output is correct
26 Correct 113 ms 21340 KB Output is correct
27 Correct 188 ms 22568 KB Output is correct
28 Correct 272 ms 34036 KB Output is correct
29 Correct 302 ms 33084 KB Output is correct
30 Correct 204 ms 22680 KB Output is correct
31 Correct 215 ms 22680 KB Output is correct
32 Correct 238 ms 22784 KB Output is correct
33 Correct 235 ms 21616 KB Output is correct
34 Correct 196 ms 22384 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 8908 KB Output is correct
2 Correct 6 ms 8908 KB Output is correct
3 Correct 6 ms 8840 KB Output is correct
4 Correct 5 ms 8836 KB Output is correct
5 Correct 5 ms 8908 KB Output is correct
6 Correct 5 ms 8908 KB Output is correct
7 Correct 5 ms 8840 KB Output is correct
8 Correct 5 ms 8840 KB Output is correct
9 Correct 5 ms 8908 KB Output is correct
10 Correct 5 ms 8908 KB Output is correct
11 Correct 5 ms 8908 KB Output is correct
12 Correct 5 ms 8908 KB Output is correct
13 Correct 5 ms 8908 KB Output is correct
14 Correct 5 ms 8908 KB Output is correct
15 Correct 5 ms 8908 KB Output is correct
16 Correct 5 ms 8844 KB Output is correct
17 Correct 5 ms 8836 KB Output is correct
18 Correct 5 ms 8908 KB Output is correct
19 Correct 6 ms 8908 KB Output is correct
20 Correct 5 ms 8908 KB Output is correct
21 Correct 5 ms 8908 KB Output is correct
22 Correct 6 ms 8908 KB Output is correct
23 Correct 6 ms 8908 KB Output is correct
24 Correct 6 ms 8960 KB Output is correct
25 Correct 6 ms 8908 KB Output is correct
26 Correct 7 ms 8980 KB Output is correct
27 Correct 6 ms 8908 KB Output is correct
28 Correct 6 ms 8908 KB Output is correct
29 Correct 6 ms 8908 KB Output is correct
30 Correct 7 ms 8908 KB Output is correct
31 Correct 6 ms 8908 KB Output is correct
32 Correct 6 ms 8984 KB Output is correct
33 Correct 7 ms 8908 KB Output is correct
34 Correct 7 ms 8976 KB Output is correct
35 Correct 6 ms 8908 KB Output is correct
36 Correct 6 ms 8908 KB Output is correct
37 Correct 6 ms 8972 KB Output is correct
38 Correct 6 ms 8908 KB Output is correct
39 Correct 147 ms 15492 KB Output is correct
40 Correct 147 ms 15572 KB Output is correct
41 Correct 195 ms 15612 KB Output is correct
42 Correct 156 ms 15752 KB Output is correct
43 Correct 92 ms 15884 KB Output is correct
44 Correct 65 ms 15760 KB Output is correct
45 Correct 147 ms 18244 KB Output is correct
46 Correct 113 ms 21340 KB Output is correct
47 Correct 188 ms 22568 KB Output is correct
48 Correct 272 ms 34036 KB Output is correct
49 Correct 302 ms 33084 KB Output is correct
50 Correct 204 ms 22680 KB Output is correct
51 Correct 215 ms 22680 KB Output is correct
52 Correct 238 ms 22784 KB Output is correct
53 Correct 235 ms 21616 KB Output is correct
54 Correct 196 ms 22384 KB Output is correct
55 Correct 14 ms 9548 KB Output is correct
56 Correct 16 ms 9580 KB Output is correct
57 Correct 100 ms 15852 KB Output is correct
58 Correct 41 ms 15520 KB Output is correct
59 Correct 132 ms 21296 KB Output is correct
60 Correct 537 ms 33220 KB Output is correct
61 Correct 233 ms 22980 KB Output is correct
62 Correct 225 ms 22724 KB Output is correct
63 Correct 297 ms 22720 KB Output is correct
64 Correct 638 ms 23108 KB Output is correct
65 Correct 246 ms 23496 KB Output is correct
66 Correct 440 ms 31224 KB Output is correct
67 Correct 129 ms 23348 KB Output is correct
68 Correct 311 ms 23536 KB Output is correct
69 Correct 305 ms 23712 KB Output is correct
70 Correct 293 ms 22920 KB Output is correct