Submission #379296

# Submission time Handle Problem Language Result Execution time Memory
379296 2021-03-17T22:03:48 Z justiny7 Race (IOI11_race) C++17
100 / 100
1118 ms 38880 KB
//#include "race.h"
#include <bits/stdc++.h>
using namespace std;

const int mxN=2e5+1, INF=1e9;
int k, ans=INF, sz[mxN];
vector<pair<int, int>> adj[mxN], vals;
map<int, int> mn;
bool vis[mxN];

int dfs_sz(int v, int p=-1) {
    sz[v]=1;
    for (auto [u, d]:adj[v])
        if (!vis[u] && u^p)
            sz[v]+=dfs_sz(u, v);
    return sz[v];
}
int dfs_centroid(int tot, int v, int p=-1) {
    for (auto [u, d]:adj[v])
        if (!vis[u] && u^p && sz[u]*2>tot)
            return dfs_centroid(tot, u, v);
    return v;
}
void dfs(int v, int len, int p=-1, int dep=1) {
    vals.emplace_back(dep, len);
    for (auto [u, d]:adj[v])
        if (!vis[u] && u^p && len+d<=k)
            dfs(u, len+d, v, dep+1);
}
void decomp(int x=0) {
    int v=dfs_centroid(dfs_sz(x), x);
    vis[v]=1;
    mn.clear();
    mn[0]=0;
    for (auto [u, d]:adj[v]) {
        if (vis[u])
            continue;
        vals.clear();
        dfs(u, d);
        for (auto [dep, len]:vals)
            if (mn.count(k-len))
                ans=min(ans, dep+mn[k-len]);
        for (auto [dep, len]:vals) {
            if (mn.count(len))
                mn[len]=min(mn[len], dep);
            else
                mn[len]=dep;
        }
    }
    for (auto [u, d]:adj[v])
        if (!vis[u])
            decomp(u);
}

int best_path(int N, int K, int H[][2], int L[]) {
    k=K;
    for (int i=0; i<N; ++i)
        adj[i].clear();
    for (int i=0; i<N-1; ++i) {
        adj[H[i][0]].emplace_back(H[i][1], L[i]);
        adj[H[i][1]].emplace_back(H[i][0], L[i]);
    }
    decomp();
    return (ans==INF?-1:ans);
}
# Verdict Execution time Memory Grader output
1 Correct 4 ms 5100 KB Output is correct
2 Correct 4 ms 5100 KB Output is correct
3 Correct 4 ms 5100 KB Output is correct
4 Correct 4 ms 5100 KB Output is correct
5 Correct 4 ms 5100 KB Output is correct
6 Correct 4 ms 5100 KB Output is correct
7 Correct 4 ms 5100 KB Output is correct
8 Correct 4 ms 5100 KB Output is correct
9 Correct 4 ms 5100 KB Output is correct
10 Correct 4 ms 5100 KB Output is correct
11 Correct 4 ms 5100 KB Output is correct
12 Correct 4 ms 5228 KB Output is correct
13 Correct 4 ms 5100 KB Output is correct
14 Correct 4 ms 5100 KB Output is correct
15 Correct 4 ms 5100 KB Output is correct
16 Correct 4 ms 5100 KB Output is correct
17 Correct 4 ms 5100 KB Output is correct
18 Correct 4 ms 5100 KB Output is correct
# Verdict Execution time Memory Grader output
1 Correct 4 ms 5100 KB Output is correct
2 Correct 4 ms 5100 KB Output is correct
3 Correct 4 ms 5100 KB Output is correct
4 Correct 4 ms 5100 KB Output is correct
5 Correct 4 ms 5100 KB Output is correct
6 Correct 4 ms 5100 KB Output is correct
7 Correct 4 ms 5100 KB Output is correct
8 Correct 4 ms 5100 KB Output is correct
9 Correct 4 ms 5100 KB Output is correct
10 Correct 4 ms 5100 KB Output is correct
11 Correct 4 ms 5100 KB Output is correct
12 Correct 4 ms 5228 KB Output is correct
13 Correct 4 ms 5100 KB Output is correct
14 Correct 4 ms 5100 KB Output is correct
15 Correct 4 ms 5100 KB Output is correct
16 Correct 4 ms 5100 KB Output is correct
17 Correct 4 ms 5100 KB Output is correct
18 Correct 4 ms 5100 KB Output is correct
19 Correct 4 ms 5228 KB Output is correct
20 Correct 4 ms 5100 KB Output is correct
21 Correct 5 ms 5100 KB Output is correct
22 Correct 4 ms 5100 KB Output is correct
23 Correct 4 ms 5100 KB Output is correct
24 Correct 4 ms 5100 KB Output is correct
25 Correct 5 ms 5100 KB Output is correct
26 Correct 6 ms 5100 KB Output is correct
27 Correct 5 ms 5100 KB Output is correct
28 Correct 5 ms 5100 KB Output is correct
29 Correct 5 ms 5100 KB Output is correct
30 Correct 5 ms 5100 KB Output is correct
31 Correct 5 ms 5100 KB Output is correct
32 Correct 5 ms 5100 KB Output is correct
33 Correct 7 ms 5100 KB Output is correct
34 Correct 6 ms 5100 KB Output is correct
35 Correct 6 ms 5100 KB Output is correct
36 Correct 5 ms 5100 KB Output is correct
37 Correct 5 ms 5100 KB Output is correct
38 Correct 5 ms 5100 KB Output is correct
# Verdict Execution time Memory Grader output
1 Correct 4 ms 5100 KB Output is correct
2 Correct 4 ms 5100 KB Output is correct
3 Correct 4 ms 5100 KB Output is correct
4 Correct 4 ms 5100 KB Output is correct
5 Correct 4 ms 5100 KB Output is correct
6 Correct 4 ms 5100 KB Output is correct
7 Correct 4 ms 5100 KB Output is correct
8 Correct 4 ms 5100 KB Output is correct
9 Correct 4 ms 5100 KB Output is correct
10 Correct 4 ms 5100 KB Output is correct
11 Correct 4 ms 5100 KB Output is correct
12 Correct 4 ms 5228 KB Output is correct
13 Correct 4 ms 5100 KB Output is correct
14 Correct 4 ms 5100 KB Output is correct
15 Correct 4 ms 5100 KB Output is correct
16 Correct 4 ms 5100 KB Output is correct
17 Correct 4 ms 5100 KB Output is correct
18 Correct 4 ms 5100 KB Output is correct
19 Correct 229 ms 11884 KB Output is correct
20 Correct 220 ms 11756 KB Output is correct
21 Correct 251 ms 12016 KB Output is correct
22 Correct 270 ms 12264 KB Output is correct
23 Correct 109 ms 12140 KB Output is correct
24 Correct 112 ms 11884 KB Output is correct
25 Correct 163 ms 14444 KB Output is correct
26 Correct 118 ms 18032 KB Output is correct
27 Correct 267 ms 18796 KB Output is correct
28 Correct 329 ms 30220 KB Output is correct
29 Correct 334 ms 29544 KB Output is correct
30 Correct 273 ms 18796 KB Output is correct
31 Correct 253 ms 18924 KB Output is correct
32 Correct 300 ms 19120 KB Output is correct
33 Correct 355 ms 17832 KB Output is correct
34 Correct 238 ms 18540 KB Output is correct
# Verdict Execution time Memory Grader output
1 Correct 4 ms 5100 KB Output is correct
2 Correct 4 ms 5100 KB Output is correct
3 Correct 4 ms 5100 KB Output is correct
4 Correct 4 ms 5100 KB Output is correct
5 Correct 4 ms 5100 KB Output is correct
6 Correct 4 ms 5100 KB Output is correct
7 Correct 4 ms 5100 KB Output is correct
8 Correct 4 ms 5100 KB Output is correct
9 Correct 4 ms 5100 KB Output is correct
10 Correct 4 ms 5100 KB Output is correct
11 Correct 4 ms 5100 KB Output is correct
12 Correct 4 ms 5228 KB Output is correct
13 Correct 4 ms 5100 KB Output is correct
14 Correct 4 ms 5100 KB Output is correct
15 Correct 4 ms 5100 KB Output is correct
16 Correct 4 ms 5100 KB Output is correct
17 Correct 4 ms 5100 KB Output is correct
18 Correct 4 ms 5100 KB Output is correct
19 Correct 4 ms 5228 KB Output is correct
20 Correct 4 ms 5100 KB Output is correct
21 Correct 5 ms 5100 KB Output is correct
22 Correct 4 ms 5100 KB Output is correct
23 Correct 4 ms 5100 KB Output is correct
24 Correct 4 ms 5100 KB Output is correct
25 Correct 5 ms 5100 KB Output is correct
26 Correct 6 ms 5100 KB Output is correct
27 Correct 5 ms 5100 KB Output is correct
28 Correct 5 ms 5100 KB Output is correct
29 Correct 5 ms 5100 KB Output is correct
30 Correct 5 ms 5100 KB Output is correct
31 Correct 5 ms 5100 KB Output is correct
32 Correct 5 ms 5100 KB Output is correct
33 Correct 7 ms 5100 KB Output is correct
34 Correct 6 ms 5100 KB Output is correct
35 Correct 6 ms 5100 KB Output is correct
36 Correct 5 ms 5100 KB Output is correct
37 Correct 5 ms 5100 KB Output is correct
38 Correct 5 ms 5100 KB Output is correct
39 Correct 229 ms 11884 KB Output is correct
40 Correct 220 ms 11756 KB Output is correct
41 Correct 251 ms 12016 KB Output is correct
42 Correct 270 ms 12264 KB Output is correct
43 Correct 109 ms 12140 KB Output is correct
44 Correct 112 ms 11884 KB Output is correct
45 Correct 163 ms 14444 KB Output is correct
46 Correct 118 ms 18032 KB Output is correct
47 Correct 267 ms 18796 KB Output is correct
48 Correct 329 ms 30220 KB Output is correct
49 Correct 334 ms 29544 KB Output is correct
50 Correct 273 ms 18796 KB Output is correct
51 Correct 253 ms 18924 KB Output is correct
52 Correct 300 ms 19120 KB Output is correct
53 Correct 355 ms 17832 KB Output is correct
54 Correct 238 ms 18540 KB Output is correct
55 Correct 23 ms 5888 KB Output is correct
56 Correct 17 ms 5740 KB Output is correct
57 Correct 154 ms 12524 KB Output is correct
58 Correct 59 ms 11616 KB Output is correct
59 Correct 314 ms 21484 KB Output is correct
60 Correct 982 ms 38880 KB Output is correct
61 Correct 333 ms 19328 KB Output is correct
62 Correct 342 ms 19180 KB Output is correct
63 Correct 416 ms 19068 KB Output is correct
64 Correct 1118 ms 24544 KB Output is correct
65 Correct 304 ms 19756 KB Output is correct
66 Correct 655 ms 27628 KB Output is correct
67 Correct 163 ms 19548 KB Output is correct
68 Correct 496 ms 23276 KB Output is correct
69 Correct 554 ms 23276 KB Output is correct
70 Correct 452 ms 22508 KB Output is correct