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답안 #595229

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
595229 2022-07-13T12:53:25 Z DAleksa 경주 (Race) (IOI11_race) C++17
100 / 100
 579 ms 46888 KB 
#include <bits/stdc++.h>
#include "race.h"

using namespace std;

#define int long long

struct edge {
    int v;
    int w;
};

const int MAX_N = 2e5 + 10;
const int mxK = 1e6 + 10;
const int inf = 1e18;

vector<edge> g[MAX_N];
int sz[MAX_N];
bool mark[MAX_N];
int cnt[mxK];
int mn[mxK];
int res = LLONG_MAX;

void get_sz(int u, int par) {
    if(mark[u]) return;
    sz[u] = 1;
    for(edge v : g[u]) {
        if(v.v == par || mark[v.v]) continue;
        get_sz(v.v, u);
        sz[u] += sz[v.v];
    }
}

void Add(int u, int par, int w, int k, int edges_count) {
    if(mark[u]) return;
    if(w > k) return;
    cnt[w]++;
    mn[w] = min(mn[w], edges_count);
    for(edge v : g[u]) {
        if(v.v == par || mark[v.v]) continue;
        Add(v.v, u, w + v.w, k, edges_count + 1);
    }
}

void Remove(int u, int par, int w, int k) {
    if(mark[u]) return;
    if(w > k) return;
    mn[w] = inf;
    cnt[w] = 0;
    for(edge v : g[u]) {
        if(v.v == par || mark[v.v]) continue;
        Remove(v.v, u, w + v.w, k);
    }
}

void dfs(int u, int par, int w, int k, int edges_count) {
    if(mark[u]) return;
    if(w >= k) return;
    if(cnt[k - w] > 0) res = min(res, edges_count + mn[k - w]);
    for(edge v : g[u]) {
        if(v.v == par || mark[v.v]) continue;
        dfs(v.v, u, w + v.w, k, edges_count + 1);
    }
}

int find_centroid(int u, int par, int n, int usize) {
    for(edge v : g[u]) {
        if(v.v == par || mark[v.v]) continue;
        if(sz[v.v] * 2 > usize) return find_centroid(v.v, u, n, usize);
    }
    return u;
}

void solve(int u, int n, int k) {
    get_sz(u, 0);
    int centroid = find_centroid(u, 0, n, sz[u]);
    mark[centroid] = true;
    for(edge v : g[centroid]) {
        if(mark[v.v]) continue;
        dfs(v.v, centroid, v.w, k, 1);
        Add(v.v, centroid, v.w, k, 1);
    }
    if(cnt[k] > 0) {
        res = min(res, mn[k]);
        assert(mn[k] > 0);
    }
    for(edge v : g[centroid]) {
        if(mark[v.v]) continue;
        Remove(v.v, centroid, v.w, k);
    }
    for(edge v : g[centroid]) {
        if(mark[v.v]) continue;
        solve(v.v, n, k);
    }
}

#undef int

int best_path(int n, int k, int h[][2], int l[]) {
    for(int i = 0; i < n - 1; i++) {
        g[h[i][0] + 1].push_back({h[i][1] + 1, l[i]});
        g[h[i][1] + 1].push_back({h[i][0] + 1, l[i]});
    }
    for(int i = 0; i < mxK; i++) mn[i] = inf;
    solve(1, n, k);
    int ret = res;
    if(ret == LLONG_MAX) return -1;
    return ret;
}

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 12756 KB Output is correct
2 Correct 7 ms 12756 KB Output is correct
3 Correct 6 ms 12756 KB Output is correct
4 Correct 9 ms 12756 KB Output is correct
5 Correct 6 ms 12816 KB Output is correct
6 Correct 9 ms 12816 KB Output is correct
7 Correct 7 ms 12816 KB Output is correct
8 Correct 7 ms 12844 KB Output is correct
9 Correct 9 ms 12812 KB Output is correct
10 Correct 7 ms 12756 KB Output is correct
11 Correct 7 ms 12812 KB Output is correct
12 Correct 6 ms 12756 KB Output is correct
13 Correct 8 ms 12756 KB Output is correct
14 Correct 7 ms 12756 KB Output is correct
15 Correct 7 ms 12756 KB Output is correct
16 Correct 8 ms 12820 KB Output is correct
17 Correct 7 ms 12808 KB Output is correct
18 Correct 8 ms 12820 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 12756 KB Output is correct
2 Correct 7 ms 12756 KB Output is correct
3 Correct 6 ms 12756 KB Output is correct
4 Correct 9 ms 12756 KB Output is correct
5 Correct 6 ms 12816 KB Output is correct
6 Correct 9 ms 12816 KB Output is correct
7 Correct 7 ms 12816 KB Output is correct
8 Correct 7 ms 12844 KB Output is correct
9 Correct 9 ms 12812 KB Output is correct
10 Correct 7 ms 12756 KB Output is correct
11 Correct 7 ms 12812 KB Output is correct
12 Correct 6 ms 12756 KB Output is correct
13 Correct 8 ms 12756 KB Output is correct
14 Correct 7 ms 12756 KB Output is correct
15 Correct 7 ms 12756 KB Output is correct
16 Correct 8 ms 12820 KB Output is correct
17 Correct 7 ms 12808 KB Output is correct
18 Correct 8 ms 12820 KB Output is correct
19 Correct 9 ms 12804 KB Output is correct
20 Correct 8 ms 12756 KB Output is correct
21 Correct 8 ms 12884 KB Output is correct
22 Correct 11 ms 16252 KB Output is correct
23 Correct 9 ms 15828 KB Output is correct
24 Correct 9 ms 16964 KB Output is correct
25 Correct 12 ms 16108 KB Output is correct
26 Correct 8 ms 15272 KB Output is correct
27 Correct 9 ms 12952 KB Output is correct
28 Correct 8 ms 14420 KB Output is correct
29 Correct 8 ms 15316 KB Output is correct
30 Correct 9 ms 15572 KB Output is correct
31 Correct 11 ms 16204 KB Output is correct
32 Correct 11 ms 16224 KB Output is correct
33 Correct 13 ms 17620 KB Output is correct
34 Correct 12 ms 16920 KB Output is correct
35 Correct 13 ms 17812 KB Output is correct
36 Correct 9 ms 18260 KB Output is correct
37 Correct 10 ms 16084 KB Output is correct
38 Correct 8 ms 14992 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 12756 KB Output is correct
2 Correct 7 ms 12756 KB Output is correct
3 Correct 6 ms 12756 KB Output is correct
4 Correct 9 ms 12756 KB Output is correct
5 Correct 6 ms 12816 KB Output is correct
6 Correct 9 ms 12816 KB Output is correct
7 Correct 7 ms 12816 KB Output is correct
8 Correct 7 ms 12844 KB Output is correct
9 Correct 9 ms 12812 KB Output is correct
10 Correct 7 ms 12756 KB Output is correct
11 Correct 7 ms 12812 KB Output is correct
12 Correct 6 ms 12756 KB Output is correct
13 Correct 8 ms 12756 KB Output is correct
14 Correct 7 ms 12756 KB Output is correct
15 Correct 7 ms 12756 KB Output is correct
16 Correct 8 ms 12820 KB Output is correct
17 Correct 7 ms 12808 KB Output is correct
18 Correct 8 ms 12820 KB Output is correct
19 Correct 172 ms 21340 KB Output is correct
20 Correct 164 ms 21240 KB Output is correct
21 Correct 209 ms 21352 KB Output is correct
22 Correct 167 ms 21308 KB Output is correct
23 Correct 81 ms 21740 KB Output is correct
24 Correct 65 ms 20996 KB Output is correct
25 Correct 151 ms 24200 KB Output is correct
26 Correct 100 ms 27096 KB Output is correct
27 Correct 180 ms 30524 KB Output is correct
28 Correct 270 ms 41876 KB Output is correct
29 Correct 267 ms 40980 KB Output is correct
30 Correct 186 ms 30568 KB Output is correct
31 Correct 157 ms 30532 KB Output is correct
32 Correct 207 ms 30672 KB Output is correct
33 Correct 270 ms 29240 KB Output is correct
34 Correct 180 ms 30156 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 12756 KB Output is correct
2 Correct 7 ms 12756 KB Output is correct
3 Correct 6 ms 12756 KB Output is correct
4 Correct 9 ms 12756 KB Output is correct
5 Correct 6 ms 12816 KB Output is correct
6 Correct 9 ms 12816 KB Output is correct
7 Correct 7 ms 12816 KB Output is correct
8 Correct 7 ms 12844 KB Output is correct
9 Correct 9 ms 12812 KB Output is correct
10 Correct 7 ms 12756 KB Output is correct
11 Correct 7 ms 12812 KB Output is correct
12 Correct 6 ms 12756 KB Output is correct
13 Correct 8 ms 12756 KB Output is correct
14 Correct 7 ms 12756 KB Output is correct
15 Correct 7 ms 12756 KB Output is correct
16 Correct 8 ms 12820 KB Output is correct
17 Correct 7 ms 12808 KB Output is correct
18 Correct 8 ms 12820 KB Output is correct
19 Correct 9 ms 12804 KB Output is correct
20 Correct 8 ms 12756 KB Output is correct
21 Correct 8 ms 12884 KB Output is correct
22 Correct 11 ms 16252 KB Output is correct
23 Correct 9 ms 15828 KB Output is correct
24 Correct 9 ms 16964 KB Output is correct
25 Correct 12 ms 16108 KB Output is correct
26 Correct 8 ms 15272 KB Output is correct
27 Correct 9 ms 12952 KB Output is correct
28 Correct 8 ms 14420 KB Output is correct
29 Correct 8 ms 15316 KB Output is correct
30 Correct 9 ms 15572 KB Output is correct
31 Correct 11 ms 16204 KB Output is correct
32 Correct 11 ms 16224 KB Output is correct
33 Correct 13 ms 17620 KB Output is correct
34 Correct 12 ms 16920 KB Output is correct
35 Correct 13 ms 17812 KB Output is correct
36 Correct 9 ms 18260 KB Output is correct
37 Correct 10 ms 16084 KB Output is correct
38 Correct 8 ms 14992 KB Output is correct
39 Correct 172 ms 21340 KB Output is correct
40 Correct 164 ms 21240 KB Output is correct
41 Correct 209 ms 21352 KB Output is correct
42 Correct 167 ms 21308 KB Output is correct
43 Correct 81 ms 21740 KB Output is correct
44 Correct 65 ms 20996 KB Output is correct
45 Correct 151 ms 24200 KB Output is correct
46 Correct 100 ms 27096 KB Output is correct
47 Correct 180 ms 30524 KB Output is correct
48 Correct 270 ms 41876 KB Output is correct
49 Correct 267 ms 40980 KB Output is correct
50 Correct 186 ms 30568 KB Output is correct
51 Correct 157 ms 30532 KB Output is correct
52 Correct 207 ms 30672 KB Output is correct
53 Correct 270 ms 29240 KB Output is correct
54 Correct 180 ms 30156 KB Output is correct
55 Correct 15 ms 13652 KB Output is correct
56 Correct 17 ms 13652 KB Output is correct
57 Correct 77 ms 21668 KB Output is correct
58 Correct 41 ms 20612 KB Output is correct
59 Correct 100 ms 28048 KB Output is correct
60 Correct 487 ms 45752 KB Output is correct
61 Correct 195 ms 30660 KB Output is correct
62 Correct 205 ms 30668 KB Output is correct
63 Correct 265 ms 30720 KB Output is correct
64 Correct 579 ms 32848 KB Output is correct
65 Correct 213 ms 31084 KB Output is correct
66 Correct 424 ms 46888 KB Output is correct
67 Correct 120 ms 29744 KB Output is correct
68 Correct 247 ms 36044 KB Output is correct
69 Correct 298 ms 36048 KB Output is correct
70 Correct 255 ms 35096 KB Output is correct