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답안 #859751

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
859751 2023-10-10T15:16:47 Z lbadea1000 경주 (Race) (IOI11_race) C++17
100 / 100
 269 ms 42180 KB 
#include <bits/stdc++.h>
#include "race.h"
using namespace std;

const int NMAX = 2e5;
const int INF = 1e9;
const int KMAX = 1e6;

int totalSize;
vector<pair<int, int>> edges[NMAX];
int sz[NMAX];
int centroidParent[NMAX];
bool isIn[NMAX];

int minimumDist[KMAX];
vector<long long> used;
int kk;
int ans;

int dfsCalcSize(int node, int parent) {
    sz[node] = 1;
    for(auto child : edges[node]) {
        if(child.first != parent && isIn[child.first]) {
            sz[node] += dfsCalcSize(child.first, node);
        }
    }
    return sz[node];
}

int dfsDetCentroid(int node, int parent) {
    for(auto child : edges[node]) {
        if(child.first != parent && sz[child.first] > totalSize / 2 && isIn[child.first]) {
            return dfsDetCentroid(child.first, node);
        }
    }
    return node;
}

void computeDist(int node, int parent, int depth, long long sum, int flag) {
    if(sum > kk)
        return;
    used.push_back(sum);
    if(flag == true) {
        ans = min(ans, minimumDist[kk - sum] + depth);
    } else {
        minimumDist[sum] = min(minimumDist[sum], depth);
    }
    for(auto child : edges[node]) {
        if(isIn[child.first] && child.first != parent) {
            computeDist(child.first, node, depth + 1, sum + child.second, flag);
        }
    }
}

void decompose(int root, int parent) {
    totalSize = dfsCalcSize(root, root);
    int centroid = dfsDetCentroid(root, root);
    isIn[centroid] = false;

    minimumDist[0] = 0;
    for(auto child : edges[centroid]) {
        if(isIn[child.first]) {
            computeDist(child.first, centroid, 1, child.second, true);
            computeDist(child.first, centroid, 1, child.second, false);
        }
    }
    for(auto x : used) {
        minimumDist[x] = INF;
    }
    used.clear();

    centroidParent[centroid] = parent;
    for(auto child : edges[centroid]) {
        if(isIn[child.first])
            decompose(child.first, centroid);
    }
}

int best_path(int n, int k, int h[][2], int len[]) {
    for(int i = 0; i < n - 1; i++) {
        edges[h[i][0]].push_back({h[i][1], len[i]});
        edges[h[i][1]].push_back({h[i][0], len[i]});
    }

    kk = k;
    for(int i = 0; i <= k; i++)
        minimumDist[i] = INF;
    for(int i = 0; i < n; i++)
        isIn[i] = true;
    ans = INF;
    decompose(0, -1);
    if(ans == INF)
        ans = -1;
    return ans;
}

/*int h[NMAX][2];
int len[NMAX];

int main() {
    int n, k;
    cin >> n >> k;
    for(int i = 0; i < n - 1; i++)
        cin >> h[i][0] >> h[i][1];
    for(int i = 0; i < n - 1; i++)
        cin >> len[i];
    cout << best_path(n, k, h, len);
    return 0;
}*/

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 12380 KB Output is correct
2 Correct 2 ms 12380 KB Output is correct
3 Correct 2 ms 12380 KB Output is correct
4 Correct 2 ms 12380 KB Output is correct
5 Correct 2 ms 12380 KB Output is correct
6 Correct 3 ms 12376 KB Output is correct
7 Correct 3 ms 12380 KB Output is correct
8 Correct 3 ms 12380 KB Output is correct
9 Correct 3 ms 12380 KB Output is correct
10 Correct 2 ms 12632 KB Output is correct
11 Correct 2 ms 12380 KB Output is correct
12 Correct 2 ms 12380 KB Output is correct
13 Correct 2 ms 12380 KB Output is correct
14 Correct 3 ms 12380 KB Output is correct
15 Correct 3 ms 12376 KB Output is correct
16 Correct 2 ms 12380 KB Output is correct
17 Correct 3 ms 12392 KB Output is correct
18 Correct 3 ms 12380 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 12380 KB Output is correct
2 Correct 2 ms 12380 KB Output is correct
3 Correct 2 ms 12380 KB Output is correct
4 Correct 2 ms 12380 KB Output is correct
5 Correct 2 ms 12380 KB Output is correct
6 Correct 3 ms 12376 KB Output is correct
7 Correct 3 ms 12380 KB Output is correct
8 Correct 3 ms 12380 KB Output is correct
9 Correct 3 ms 12380 KB Output is correct
10 Correct 2 ms 12632 KB Output is correct
11 Correct 2 ms 12380 KB Output is correct
12 Correct 2 ms 12380 KB Output is correct
13 Correct 2 ms 12380 KB Output is correct
14 Correct 3 ms 12380 KB Output is correct
15 Correct 3 ms 12376 KB Output is correct
16 Correct 2 ms 12380 KB Output is correct
17 Correct 3 ms 12392 KB Output is correct
18 Correct 3 ms 12380 KB Output is correct
19 Correct 2 ms 12376 KB Output is correct
20 Correct 3 ms 12628 KB Output is correct
21 Correct 3 ms 12376 KB Output is correct
22 Correct 3 ms 14428 KB Output is correct
23 Correct 3 ms 14424 KB Output is correct
24 Correct 3 ms 14428 KB Output is correct
25 Correct 3 ms 14428 KB Output is correct
26 Correct 3 ms 14428 KB Output is correct
27 Correct 5 ms 14456 KB Output is correct
28 Correct 3 ms 14428 KB Output is correct
29 Correct 3 ms 14428 KB Output is correct
30 Correct 3 ms 14428 KB Output is correct
31 Correct 3 ms 14428 KB Output is correct
32 Correct 3 ms 14428 KB Output is correct
33 Correct 4 ms 14424 KB Output is correct
34 Correct 3 ms 14428 KB Output is correct
35 Correct 3 ms 14448 KB Output is correct
36 Correct 3 ms 14424 KB Output is correct
37 Correct 3 ms 14428 KB Output is correct
38 Correct 4 ms 14484 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 12380 KB Output is correct
2 Correct 2 ms 12380 KB Output is correct
3 Correct 2 ms 12380 KB Output is correct
4 Correct 2 ms 12380 KB Output is correct
5 Correct 2 ms 12380 KB Output is correct
6 Correct 3 ms 12376 KB Output is correct
7 Correct 3 ms 12380 KB Output is correct
8 Correct 3 ms 12380 KB Output is correct
9 Correct 3 ms 12380 KB Output is correct
10 Correct 2 ms 12632 KB Output is correct
11 Correct 2 ms 12380 KB Output is correct
12 Correct 2 ms 12380 KB Output is correct
13 Correct 2 ms 12380 KB Output is correct
14 Correct 3 ms 12380 KB Output is correct
15 Correct 3 ms 12376 KB Output is correct
16 Correct 2 ms 12380 KB Output is correct
17 Correct 3 ms 12392 KB Output is correct
18 Correct 3 ms 12380 KB Output is correct
19 Correct 73 ms 19932 KB Output is correct
20 Correct 72 ms 19800 KB Output is correct
21 Correct 79 ms 20588 KB Output is correct
22 Correct 84 ms 21704 KB Output is correct
23 Correct 45 ms 19932 KB Output is correct
24 Correct 35 ms 19804 KB Output is correct
25 Correct 78 ms 22292 KB Output is correct
26 Correct 68 ms 27348 KB Output is correct
27 Correct 97 ms 25180 KB Output is correct
28 Correct 150 ms 36176 KB Output is correct
29 Correct 148 ms 35412 KB Output is correct
30 Correct 124 ms 25172 KB Output is correct
31 Correct 99 ms 25216 KB Output is correct
32 Correct 113 ms 25168 KB Output is correct
33 Correct 121 ms 23888 KB Output is correct
34 Correct 102 ms 24696 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 12380 KB Output is correct
2 Correct 2 ms 12380 KB Output is correct
3 Correct 2 ms 12380 KB Output is correct
4 Correct 2 ms 12380 KB Output is correct
5 Correct 2 ms 12380 KB Output is correct
6 Correct 3 ms 12376 KB Output is correct
7 Correct 3 ms 12380 KB Output is correct
8 Correct 3 ms 12380 KB Output is correct
9 Correct 3 ms 12380 KB Output is correct
10 Correct 2 ms 12632 KB Output is correct
11 Correct 2 ms 12380 KB Output is correct
12 Correct 2 ms 12380 KB Output is correct
13 Correct 2 ms 12380 KB Output is correct
14 Correct 3 ms 12380 KB Output is correct
15 Correct 3 ms 12376 KB Output is correct
16 Correct 2 ms 12380 KB Output is correct
17 Correct 3 ms 12392 KB Output is correct
18 Correct 3 ms 12380 KB Output is correct
19 Correct 2 ms 12376 KB Output is correct
20 Correct 3 ms 12628 KB Output is correct
21 Correct 3 ms 12376 KB Output is correct
22 Correct 3 ms 14428 KB Output is correct
23 Correct 3 ms 14424 KB Output is correct
24 Correct 3 ms 14428 KB Output is correct
25 Correct 3 ms 14428 KB Output is correct
26 Correct 3 ms 14428 KB Output is correct
27 Correct 5 ms 14456 KB Output is correct
28 Correct 3 ms 14428 KB Output is correct
29 Correct 3 ms 14428 KB Output is correct
30 Correct 3 ms 14428 KB Output is correct
31 Correct 3 ms 14428 KB Output is correct
32 Correct 3 ms 14428 KB Output is correct
33 Correct 4 ms 14424 KB Output is correct
34 Correct 3 ms 14428 KB Output is correct
35 Correct 3 ms 14448 KB Output is correct
36 Correct 3 ms 14424 KB Output is correct
37 Correct 3 ms 14428 KB Output is correct
38 Correct 4 ms 14484 KB Output is correct
39 Correct 73 ms 19932 KB Output is correct
40 Correct 72 ms 19800 KB Output is correct
41 Correct 79 ms 20588 KB Output is correct
42 Correct 84 ms 21704 KB Output is correct
43 Correct 45 ms 19932 KB Output is correct
44 Correct 35 ms 19804 KB Output is correct
45 Correct 78 ms 22292 KB Output is correct
46 Correct 68 ms 27348 KB Output is correct
47 Correct 97 ms 25180 KB Output is correct
48 Correct 150 ms 36176 KB Output is correct
49 Correct 148 ms 35412 KB Output is correct
50 Correct 124 ms 25172 KB Output is correct
51 Correct 99 ms 25216 KB Output is correct
52 Correct 113 ms 25168 KB Output is correct
53 Correct 121 ms 23888 KB Output is correct
54 Correct 102 ms 24696 KB Output is correct
55 Correct 8 ms 13144 KB Output is correct
56 Correct 10 ms 13172 KB Output is correct
57 Correct 55 ms 21960 KB Output is correct
58 Correct 29 ms 21580 KB Output is correct
59 Correct 75 ms 29388 KB Output is correct
60 Correct 269 ms 42180 KB Output is correct
61 Correct 124 ms 26368 KB Output is correct
62 Correct 121 ms 32708 KB Output is correct
63 Correct 145 ms 32424 KB Output is correct
64 Correct 262 ms 33136 KB Output is correct
65 Correct 108 ms 25960 KB Output is correct
66 Correct 224 ms 35780 KB Output is correct
67 Correct 75 ms 33632 KB Output is correct
68 Correct 145 ms 30152 KB Output is correct
69 Correct 137 ms 30152 KB Output is correct
70 Correct 127 ms 29640 KB Output is correct