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답안 #471068

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
471068 2021-09-07T01:21:31 Z jli12345 경주 (Race) (IOI11_race) C++14
100 / 100
 1571 ms 58104 KB 
#include <bits/stdc++.h>
using namespace std;

void fastIO(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
}

typedef long long ll;

vector<pair<int, int> > edges[200100];
int sub[200100];
bool rem[200100];

int LEN;


void dfs(int node, int pa = 0){
    sub[node] = 1;
    for (pair<int, int> nx : edges[node]){
        if (nx.first == pa || rem[nx.first])
            continue;
        dfs(nx.first, node);    
        sub[node] += sub[nx.first];
    }
}

int centroid(int node, int sz, int pa = 0){
    for (pair<int, int> nx : edges[node]){
        if (nx.first == pa || rem[nx.first])
            continue;
        if (sub[nx.first] > sz/2)
            return centroid(nx.first, sz, node);    
    }
    return node;
}

void dfs2(int node, ll dep, int cur, map<ll, int> &mp, int pa = 0){
    if (mp.count(dep))
        mp[dep] = min(mp[dep], cur);
    else
        mp[dep] = cur;
    for (pair<int, int> nx : edges[node]){
        if (nx.first == pa || rem[nx.first])
            continue;
        dfs2(nx.first, dep+nx.second, cur+1, mp, node);
    }
}

int INF = 0x3f3f3f3f;

int decomp(int node){
    dfs(node);
    int cent = centroid(node, sub[node]);
    rem[cent] = true;
    map<ll, int> mp;
    int curmin = INF;
    mp[0] = 0;
    for (pair<int, int> nx : edges[cent]){
        if (rem[nx.first])
            continue;
        map<ll, int> tmp;
        dfs2(nx.first, nx.second, 1, tmp);
        for (auto it = tmp.begin(); it != tmp.end(); it++){
            if (mp.count(LEN-(*it).first))
                curmin = min(curmin, (*it).second+mp[LEN-(*it).first]);
        }
        for (auto it = tmp.begin(); it != tmp.end(); it++){
            if (!mp.count((*it).first))
                mp[(*it).first] = (*it).second;
            else
                mp[(*it).first] = min(mp[(*it).first], (*it).second);
        }
    }
    int totmin = curmin;
    for (pair<int, int> nx : edges[cent]){
        if (rem[nx.first])
            continue;
        int val = decomp(nx.first);
        if (val == -1)
            continue;
        totmin = min(totmin, val);
    }
    if (totmin == INF)
        return -1;
    return totmin;
}

int best_path(int N, int K, int H[][2], int *L){
    LEN = K;
    for (int i = 0; i < N-1; i++){
        int a = H[i][0], b = H[i][1];
        a++, b++;
        edges[a].push_back({b, L[i]});
        edges[b].push_back({a, L[i]});
    }
    return decomp(1);
}

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 3 ms 4940 KB Output is correct
3 Correct 3 ms 4940 KB Output is correct
4 Correct 3 ms 4980 KB Output is correct
5 Correct 3 ms 4940 KB Output is correct
6 Correct 3 ms 4940 KB Output is correct
7 Correct 4 ms 4940 KB Output is correct
8 Correct 4 ms 4940 KB Output is correct
9 Correct 3 ms 5000 KB Output is correct
10 Correct 3 ms 4940 KB Output is correct
11 Correct 3 ms 4940 KB Output is correct
12 Correct 3 ms 4940 KB Output is correct
13 Correct 3 ms 4940 KB Output is correct
14 Correct 3 ms 4940 KB Output is correct
15 Correct 4 ms 4940 KB Output is correct
16 Correct 3 ms 4940 KB Output is correct
17 Correct 4 ms 4940 KB Output is correct
18 Correct 3 ms 4940 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 3 ms 4940 KB Output is correct
3 Correct 3 ms 4940 KB Output is correct
4 Correct 3 ms 4980 KB Output is correct
5 Correct 3 ms 4940 KB Output is correct
6 Correct 3 ms 4940 KB Output is correct
7 Correct 4 ms 4940 KB Output is correct
8 Correct 4 ms 4940 KB Output is correct
9 Correct 3 ms 5000 KB Output is correct
10 Correct 3 ms 4940 KB Output is correct
11 Correct 3 ms 4940 KB Output is correct
12 Correct 3 ms 4940 KB Output is correct
13 Correct 3 ms 4940 KB Output is correct
14 Correct 3 ms 4940 KB Output is correct
15 Correct 4 ms 4940 KB Output is correct
16 Correct 3 ms 4940 KB Output is correct
17 Correct 4 ms 4940 KB Output is correct
18 Correct 3 ms 4940 KB Output is correct
19 Correct 4 ms 4940 KB Output is correct
20 Correct 3 ms 4940 KB Output is correct
21 Correct 5 ms 5068 KB Output is correct
22 Correct 6 ms 5196 KB Output is correct
23 Correct 6 ms 5144 KB Output is correct
24 Correct 6 ms 5196 KB Output is correct
25 Correct 5 ms 5196 KB Output is correct
26 Correct 5 ms 5068 KB Output is correct
27 Correct 4 ms 5068 KB Output is correct
28 Correct 5 ms 5196 KB Output is correct
29 Correct 5 ms 5196 KB Output is correct
30 Correct 5 ms 5148 KB Output is correct
31 Correct 5 ms 5148 KB Output is correct
32 Correct 6 ms 5196 KB Output is correct
33 Correct 6 ms 5196 KB Output is correct
34 Correct 6 ms 5196 KB Output is correct
35 Correct 5 ms 5068 KB Output is correct
36 Correct 5 ms 5196 KB Output is correct
37 Correct 5 ms 5068 KB Output is correct
38 Correct 5 ms 5068 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 3 ms 4940 KB Output is correct
3 Correct 3 ms 4940 KB Output is correct
4 Correct 3 ms 4980 KB Output is correct
5 Correct 3 ms 4940 KB Output is correct
6 Correct 3 ms 4940 KB Output is correct
7 Correct 4 ms 4940 KB Output is correct
8 Correct 4 ms 4940 KB Output is correct
9 Correct 3 ms 5000 KB Output is correct
10 Correct 3 ms 4940 KB Output is correct
11 Correct 3 ms 4940 KB Output is correct
12 Correct 3 ms 4940 KB Output is correct
13 Correct 3 ms 4940 KB Output is correct
14 Correct 3 ms 4940 KB Output is correct
15 Correct 4 ms 4940 KB Output is correct
16 Correct 3 ms 4940 KB Output is correct
17 Correct 4 ms 4940 KB Output is correct
18 Correct 3 ms 4940 KB Output is correct
19 Correct 288 ms 11808 KB Output is correct
20 Correct 287 ms 11668 KB Output is correct
21 Correct 288 ms 11812 KB Output is correct
22 Correct 248 ms 11864 KB Output is correct
23 Correct 449 ms 12344 KB Output is correct
24 Correct 193 ms 11972 KB Output is correct
25 Correct 231 ms 16436 KB Output is correct
26 Correct 106 ms 18896 KB Output is correct
27 Correct 439 ms 19172 KB Output is correct
28 Correct 1517 ms 58104 KB Output is correct
29 Correct 1479 ms 57028 KB Output is correct
30 Correct 430 ms 19140 KB Output is correct
31 Correct 435 ms 19140 KB Output is correct
32 Correct 508 ms 19296 KB Output is correct
33 Correct 674 ms 18300 KB Output is correct
34 Correct 1374 ms 40548 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 3 ms 4940 KB Output is correct
3 Correct 3 ms 4940 KB Output is correct
4 Correct 3 ms 4980 KB Output is correct
5 Correct 3 ms 4940 KB Output is correct
6 Correct 3 ms 4940 KB Output is correct
7 Correct 4 ms 4940 KB Output is correct
8 Correct 4 ms 4940 KB Output is correct
9 Correct 3 ms 5000 KB Output is correct
10 Correct 3 ms 4940 KB Output is correct
11 Correct 3 ms 4940 KB Output is correct
12 Correct 3 ms 4940 KB Output is correct
13 Correct 3 ms 4940 KB Output is correct
14 Correct 3 ms 4940 KB Output is correct
15 Correct 4 ms 4940 KB Output is correct
16 Correct 3 ms 4940 KB Output is correct
17 Correct 4 ms 4940 KB Output is correct
18 Correct 3 ms 4940 KB Output is correct
19 Correct 4 ms 4940 KB Output is correct
20 Correct 3 ms 4940 KB Output is correct
21 Correct 5 ms 5068 KB Output is correct
22 Correct 6 ms 5196 KB Output is correct
23 Correct 6 ms 5144 KB Output is correct
24 Correct 6 ms 5196 KB Output is correct
25 Correct 5 ms 5196 KB Output is correct
26 Correct 5 ms 5068 KB Output is correct
27 Correct 4 ms 5068 KB Output is correct
28 Correct 5 ms 5196 KB Output is correct
29 Correct 5 ms 5196 KB Output is correct
30 Correct 5 ms 5148 KB Output is correct
31 Correct 5 ms 5148 KB Output is correct
32 Correct 6 ms 5196 KB Output is correct
33 Correct 6 ms 5196 KB Output is correct
34 Correct 6 ms 5196 KB Output is correct
35 Correct 5 ms 5068 KB Output is correct
36 Correct 5 ms 5196 KB Output is correct
37 Correct 5 ms 5068 KB Output is correct
38 Correct 5 ms 5068 KB Output is correct
39 Correct 288 ms 11808 KB Output is correct
40 Correct 287 ms 11668 KB Output is correct
41 Correct 288 ms 11812 KB Output is correct
42 Correct 248 ms 11864 KB Output is correct
43 Correct 449 ms 12344 KB Output is correct
44 Correct 193 ms 11972 KB Output is correct
45 Correct 231 ms 16436 KB Output is correct
46 Correct 106 ms 18896 KB Output is correct
47 Correct 439 ms 19172 KB Output is correct
48 Correct 1517 ms 58104 KB Output is correct
49 Correct 1479 ms 57028 KB Output is correct
50 Correct 430 ms 19140 KB Output is correct
51 Correct 435 ms 19140 KB Output is correct
52 Correct 508 ms 19296 KB Output is correct
53 Correct 674 ms 18300 KB Output is correct
54 Correct 1374 ms 40548 KB Output is correct
55 Correct 37 ms 6360 KB Output is correct
56 Correct 22 ms 5700 KB Output is correct
57 Correct 180 ms 11916 KB Output is correct
58 Correct 60 ms 11588 KB Output is correct
59 Correct 546 ms 28420 KB Output is correct
60 Correct 1571 ms 55368 KB Output is correct
61 Correct 504 ms 20932 KB Output is correct
62 Correct 431 ms 19140 KB Output is correct
63 Correct 495 ms 19140 KB Output is correct
64 Correct 1406 ms 33972 KB Output is correct
65 Correct 1222 ms 41556 KB Output is correct
66 Correct 1537 ms 54684 KB Output is correct
67 Correct 185 ms 19504 KB Output is correct
68 Correct 715 ms 35372 KB Output is correct
69 Correct 728 ms 35992 KB Output is correct
70 Correct 644 ms 34140 KB Output is correct