oj.uz

답안 #922009

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
922009 2024-02-04T16:52:39 Z Beerus13 경주 (Race) (IOI11_race) C++14
100 / 100
 229 ms 37828 KB 
#include<bits/stdc++.h>
using namespace std;
#define ll long long 
#define pii pair<int, int>
const int N = 2e5 + 5;
const int K = 1e6 + 5;
const int inf = 1e9;

int n, k;
int dp[K], val[N], dep[N], cnt[N], sz[N];
bool del[N];
vector<pii> g[N];
vector<int> node, tree;
int ans = inf;

int dfs_size(int u, int p = 0) {
    sz[u] = 1;
    for(auto [v, _] : g[u]) if(v != p && !del[v]) sz[u] += dfs_size(v, u);
    return sz[u];
}

int find_centroid(int u, int p, int num) {
    for(auto [v, _] : g[u]) if(v != p && !del[v] && sz[v] > num / 2) return find_centroid(v, u, num);
    return u;
}

void dfs_centroid(int u, int p) {
    if(val[u] > k) return;
    dep[u] = dep[p] + 1;
    node.push_back(u);
    tree.push_back(u);
    ans = min(ans, dep[u] + dp[k - val[u]]);
    for(auto [v, w] : g[u]) if(v != p && !del[v]) {
        val[v] = val[u] + w;
        dfs_centroid(v, u);
    }
}

void decomposition(int u) {
    int centroid = find_centroid(u, 0, dfs_size(u));
    del[centroid] = 1;
    dep[centroid] = val[centroid] = dp[0] = 0;
    tree.push_back(centroid);
    for(auto [v, w] : g[centroid]) if(!del[v]) {
        val[v] = w;
        dfs_centroid(v, centroid);
        for(int x : node) dp[val[x]] = min(dp[val[x]], dep[x]);
        node.clear();
    }
    for(int x : tree) dp[val[x]] = inf;
    tree.clear();
    for(auto [v, _] : g[centroid]) if(!del[v]) {
        decomposition(v);
    }
}

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 u = H[i][0], v = H[i][1], w = L[i];
        ++u; ++v;
        g[u].emplace_back(v, w);
        g[v].emplace_back(u, w);
    }
    memset(dp, 0x3f, sizeof(dp));
    decomposition(1);
    return ans == inf ? -1 : ans;
}

// void solve() {
//     cin >> n >> k;
//     for(int i = 1, u, v, w; i < n; ++i) {
//         cin >> u >> v >> w;
//         ++u; ++v;
//         g[u].emplace_back(v, w);
//         g[v].emplace_back(u, w);
//     }
//     memset(dp, 0x3f, sizeof(dp));
//     decomposition(1);
//     cout << (ans == inf ? -1 : ans) << '\n';
// }
 
// signed main() {
//     ios::sync_with_stdio(0);
//     cin.tie(0); cout.tie(0);
//     int test = 1;
//     // cin >> test;
//     while(test--) solve();
//     return 0;
// }

// https://oj.uz/problem/view/IOI11_race

Compilation message

race.cpp: In function 'int dfs_size(int, int)':
race.cpp:18:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   18 |     for(auto [v, _] : g[u]) if(v != p && !del[v]) sz[u] += dfs_size(v, u);
      |              ^
race.cpp: In function 'int find_centroid(int, int, int)':
race.cpp:23:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   23 |     for(auto [v, _] : g[u]) if(v != p && !del[v] && sz[v] > num / 2) return find_centroid(v, u, num);
      |              ^
race.cpp: In function 'void dfs_centroid(int, int)':
race.cpp:33:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   33 |     for(auto [v, w] : g[u]) if(v != p && !del[v]) {
      |              ^
race.cpp: In function 'void decomposition(int)':
race.cpp:44:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   44 |     for(auto [v, w] : g[centroid]) if(!del[v]) {
      |              ^
race.cpp:52:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   52 |     for(auto [v, _] : g[centroid]) if(!del[v]) {
      |              ^

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 15964 KB Output is correct
2 Correct 3 ms 15964 KB Output is correct
3 Correct 3 ms 15964 KB Output is correct
4 Correct 3 ms 15964 KB Output is correct
5 Correct 3 ms 15964 KB Output is correct
6 Correct 4 ms 15964 KB Output is correct
7 Correct 4 ms 15964 KB Output is correct
8 Correct 3 ms 15964 KB Output is correct
9 Correct 3 ms 15964 KB Output is correct
10 Correct 3 ms 15964 KB Output is correct
11 Correct 3 ms 15964 KB Output is correct
12 Correct 4 ms 15808 KB Output is correct
13 Correct 3 ms 15964 KB Output is correct
14 Correct 3 ms 15840 KB Output is correct
15 Correct 3 ms 15964 KB Output is correct
16 Correct 3 ms 15964 KB Output is correct
17 Correct 3 ms 15960 KB Output is correct
18 Correct 3 ms 15964 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 15964 KB Output is correct
2 Correct 3 ms 15964 KB Output is correct
3 Correct 3 ms 15964 KB Output is correct
4 Correct 3 ms 15964 KB Output is correct
5 Correct 3 ms 15964 KB Output is correct
6 Correct 4 ms 15964 KB Output is correct
7 Correct 4 ms 15964 KB Output is correct
8 Correct 3 ms 15964 KB Output is correct
9 Correct 3 ms 15964 KB Output is correct
10 Correct 3 ms 15964 KB Output is correct
11 Correct 3 ms 15964 KB Output is correct
12 Correct 4 ms 15808 KB Output is correct
13 Correct 3 ms 15964 KB Output is correct
14 Correct 3 ms 15840 KB Output is correct
15 Correct 3 ms 15964 KB Output is correct
16 Correct 3 ms 15964 KB Output is correct
17 Correct 3 ms 15960 KB Output is correct
18 Correct 3 ms 15964 KB Output is correct
19 Correct 3 ms 15964 KB Output is correct
20 Correct 4 ms 15964 KB Output is correct
21 Correct 3 ms 15964 KB Output is correct
22 Correct 4 ms 15960 KB Output is correct
23 Correct 3 ms 15960 KB Output is correct
24 Correct 3 ms 15964 KB Output is correct
25 Correct 3 ms 15964 KB Output is correct
26 Correct 3 ms 15964 KB Output is correct
27 Correct 3 ms 15964 KB Output is correct
28 Correct 3 ms 15964 KB Output is correct
29 Correct 3 ms 15960 KB Output is correct
30 Correct 3 ms 15960 KB Output is correct
31 Correct 3 ms 15960 KB Output is correct
32 Correct 3 ms 15964 KB Output is correct
33 Correct 3 ms 15964 KB Output is correct
34 Correct 3 ms 15964 KB Output is correct
35 Correct 4 ms 15960 KB Output is correct
36 Correct 3 ms 15960 KB Output is correct
37 Correct 3 ms 15964 KB Output is correct
38 Correct 3 ms 16052 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 15964 KB Output is correct
2 Correct 3 ms 15964 KB Output is correct
3 Correct 3 ms 15964 KB Output is correct
4 Correct 3 ms 15964 KB Output is correct
5 Correct 3 ms 15964 KB Output is correct
6 Correct 4 ms 15964 KB Output is correct
7 Correct 4 ms 15964 KB Output is correct
8 Correct 3 ms 15964 KB Output is correct
9 Correct 3 ms 15964 KB Output is correct
10 Correct 3 ms 15964 KB Output is correct
11 Correct 3 ms 15964 KB Output is correct
12 Correct 4 ms 15808 KB Output is correct
13 Correct 3 ms 15964 KB Output is correct
14 Correct 3 ms 15840 KB Output is correct
15 Correct 3 ms 15964 KB Output is correct
16 Correct 3 ms 15964 KB Output is correct
17 Correct 3 ms 15960 KB Output is correct
18 Correct 3 ms 15964 KB Output is correct
19 Correct 68 ms 21852 KB Output is correct
20 Correct 81 ms 21960 KB Output is correct
21 Correct 71 ms 22352 KB Output is correct
22 Correct 65 ms 22536 KB Output is correct
23 Correct 49 ms 22100 KB Output is correct
24 Correct 38 ms 21844 KB Output is correct
25 Correct 75 ms 24436 KB Output is correct
26 Correct 80 ms 28428 KB Output is correct
27 Correct 103 ms 25760 KB Output is correct
28 Correct 155 ms 36944 KB Output is correct
29 Correct 145 ms 35920 KB Output is correct
30 Correct 100 ms 25852 KB Output is correct
31 Correct 104 ms 25848 KB Output is correct
32 Correct 133 ms 25720 KB Output is correct
33 Correct 132 ms 24504 KB Output is correct
34 Correct 104 ms 24400 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 15964 KB Output is correct
2 Correct 3 ms 15964 KB Output is correct
3 Correct 3 ms 15964 KB Output is correct
4 Correct 3 ms 15964 KB Output is correct
5 Correct 3 ms 15964 KB Output is correct
6 Correct 4 ms 15964 KB Output is correct
7 Correct 4 ms 15964 KB Output is correct
8 Correct 3 ms 15964 KB Output is correct
9 Correct 3 ms 15964 KB Output is correct
10 Correct 3 ms 15964 KB Output is correct
11 Correct 3 ms 15964 KB Output is correct
12 Correct 4 ms 15808 KB Output is correct
13 Correct 3 ms 15964 KB Output is correct
14 Correct 3 ms 15840 KB Output is correct
15 Correct 3 ms 15964 KB Output is correct
16 Correct 3 ms 15964 KB Output is correct
17 Correct 3 ms 15960 KB Output is correct
18 Correct 3 ms 15964 KB Output is correct
19 Correct 3 ms 15964 KB Output is correct
20 Correct 4 ms 15964 KB Output is correct
21 Correct 3 ms 15964 KB Output is correct
22 Correct 4 ms 15960 KB Output is correct
23 Correct 3 ms 15960 KB Output is correct
24 Correct 3 ms 15964 KB Output is correct
25 Correct 3 ms 15964 KB Output is correct
26 Correct 3 ms 15964 KB Output is correct
27 Correct 3 ms 15964 KB Output is correct
28 Correct 3 ms 15964 KB Output is correct
29 Correct 3 ms 15960 KB Output is correct
30 Correct 3 ms 15960 KB Output is correct
31 Correct 3 ms 15960 KB Output is correct
32 Correct 3 ms 15964 KB Output is correct
33 Correct 3 ms 15964 KB Output is correct
34 Correct 3 ms 15964 KB Output is correct
35 Correct 4 ms 15960 KB Output is correct
36 Correct 3 ms 15960 KB Output is correct
37 Correct 3 ms 15964 KB Output is correct
38 Correct 3 ms 16052 KB Output is correct
39 Correct 68 ms 21852 KB Output is correct
40 Correct 81 ms 21960 KB Output is correct
41 Correct 71 ms 22352 KB Output is correct
42 Correct 65 ms 22536 KB Output is correct
43 Correct 49 ms 22100 KB Output is correct
44 Correct 38 ms 21844 KB Output is correct
45 Correct 75 ms 24436 KB Output is correct
46 Correct 80 ms 28428 KB Output is correct
47 Correct 103 ms 25760 KB Output is correct
48 Correct 155 ms 36944 KB Output is correct
49 Correct 145 ms 35920 KB Output is correct
50 Correct 100 ms 25852 KB Output is correct
51 Correct 104 ms 25848 KB Output is correct
52 Correct 133 ms 25720 KB Output is correct
53 Correct 132 ms 24504 KB Output is correct
54 Correct 104 ms 24400 KB Output is correct
55 Correct 7 ms 16476 KB Output is correct
56 Correct 8 ms 16552 KB Output is correct
57 Correct 60 ms 22888 KB Output is correct
58 Correct 33 ms 23052 KB Output is correct
59 Correct 66 ms 28424 KB Output is correct
60 Correct 229 ms 37828 KB Output is correct
61 Correct 118 ms 26044 KB Output is correct
62 Correct 110 ms 26840 KB Output is correct
63 Correct 166 ms 27136 KB Output is correct
64 Correct 207 ms 27000 KB Output is correct
65 Correct 142 ms 25460 KB Output is correct
66 Correct 214 ms 34168 KB Output is correct
67 Correct 84 ms 27840 KB Output is correct
68 Correct 142 ms 26596 KB Output is correct
69 Correct 145 ms 26584 KB Output is correct
70 Correct 172 ms 26576 KB Output is correct