oj.uz

답안 #990838

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
990838 2024-05-31T13:35:07 Z vjudge 경주 (Race) (IOI11_race) C++14
100 / 100
 269 ms 40368 KB 
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <algorithm>
#include <vector>
#include <utility>
#include <queue>
using namespace std;
typedef pair<int,int> pi;
 
vector<pi> graph[200005];
 
int ret = 1e9;
int size[200005], maxtree[200005];
int kill[200005];
int k;
 
vector<int> new_vis;
 
int dfs(int p, int pa){
    if(kill[p]) return 0;
    new_vis.push_back(p);
    int cs = 1;
    int maxv = 0;
    for (int i=0; i<graph[p].size(); i++) {
        if(graph[p][i].second == pa) continue;
        int t = dfs(graph[p][i].second,p);
        maxv = max(t,maxv);
        cs += t;
    }
    maxtree[p] = maxv;
    return size[p] = cs;
}
 
int get_mid(int p){
    for (int i=0; i<new_vis.size(); i++) {
        size[new_vis[i]] = 0;
        maxtree[new_vis[i]] = 0;
    }
    new_vis.clear();
    int full = dfs(p,-1);
    int mid_pos = 0, mid_res =1e9;
    for (int i=0; i<new_vis.size(); i++) {
        maxtree[new_vis[i]] = max(maxtree[new_vis[i]],full - size[new_vis[i]]);
        if(mid_res > maxtree[new_vis[i]]){
            mid_pos = new_vis[i];
            mid_res = maxtree[mid_pos];
        }
    }
    return mid_pos;
}
 
int *v;
int *stamp;
int timestamp;
 
void solve(int p){
    ++timestamp;
    int mid = get_mid(p);
    kill[mid] = 1;
    v[0] = 0;
    stamp[0] = timestamp;
    for (int i=0; i<graph[mid].size(); i++) {
        if(kill[graph[mid][i].second]) continue;
        queue<int> q,d,p,l;
        vector<int> cd1, cd2;
        if(graph[mid][i].first > k) continue;
        q.push(graph[mid][i].second);
        d.push(graph[mid][i].first);
        l.push(1);
        p.push(mid);
        while (!q.empty()) {
            int qf = q.front();
            int df = d.front();
            int pf = p.front();
            int lf = l.front();
            cd1.push_back(df);
            cd2.push_back(lf);
            if(stamp[k-df] == timestamp) ret = min(v[k-df] + lf,ret);
            q.pop();
            d.pop();
            p.pop();
            l.pop();
            for (int i=0; i<graph[qf].size(); i++) {
                int pos = graph[qf][i].second;
                if(kill[pos] || pos == pf) continue;
                if(df + graph[qf][i].first > k) continue;
                q.push(pos);
                d.push(df + graph[qf][i].first);
                p.push(qf);
                l.push(lf + 1);
            }
        }
        for (int i=0; i<cd1.size(); i++) {
            if(stamp[cd1[i]] != timestamp){
                v[cd1[i]] = cd2[i];
                stamp[cd1[i]] = timestamp;
            }
            else v[cd1[i]] = min(v[cd1[i]],cd2[i]);
        }
    }
    for (int i=0; i<graph[mid].size(); i++) {
        if(kill[graph[mid][i].second]) continue;
        solve(graph[mid][i].second);
    }
}
 
int best_path(int N, int K, int H[][2], int L[]){
    for (int i=0; i<N-1; i++) {
        graph[H[i][0]].push_back(pi(L[i],H[i][1]));
        graph[H[i][1]].push_back(pi(L[i],H[i][0]));
    }
    v = (int*)calloc(K+1,sizeof(int));
    stamp = (int*)calloc(K+1,sizeof(int));
    k = K;
    solve(0);
    if(ret > 1e8) return -1;
    return ret;
}

Compilation message

race.cpp: In function 'int dfs(int, int)':
race.cpp:25:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |     for (int i=0; i<graph[p].size(); i++) {
      |                   ~^~~~~~~~~~~~~~~~
race.cpp: In function 'int get_mid(int)':
race.cpp:36:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |     for (int i=0; i<new_vis.size(); i++) {
      |                   ~^~~~~~~~~~~~~~~
race.cpp:43:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |     for (int i=0; i<new_vis.size(); i++) {
      |                   ~^~~~~~~~~~~~~~~
race.cpp: In function 'void solve(int)':
race.cpp:63:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   63 |     for (int i=0; i<graph[mid].size(); i++) {
      |                   ~^~~~~~~~~~~~~~~~~~
race.cpp:84:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   84 |             for (int i=0; i<graph[qf].size(); i++) {
      |                           ~^~~~~~~~~~~~~~~~~
race.cpp:94:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   94 |         for (int i=0; i<cd1.size(); i++) {
      |                       ~^~~~~~~~~~~
race.cpp:102:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  102 |     for (int i=0; i<graph[mid].size(); i++) {
      |                   ~^~~~~~~~~~~~~~~~~~

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 10076 KB Output is correct
2 Correct 2 ms 10076 KB Output is correct
3 Correct 2 ms 10076 KB Output is correct
4 Correct 3 ms 10076 KB Output is correct
5 Correct 2 ms 10076 KB Output is correct
6 Correct 2 ms 10076 KB Output is correct
7 Correct 2 ms 10076 KB Output is correct
8 Correct 2 ms 10076 KB Output is correct
9 Correct 2 ms 10076 KB Output is correct
10 Correct 2 ms 10076 KB Output is correct
11 Correct 2 ms 10076 KB Output is correct
12 Correct 2 ms 10260 KB Output is correct
13 Correct 2 ms 10076 KB Output is correct
14 Correct 2 ms 10076 KB Output is correct
15 Correct 2 ms 10076 KB Output is correct
16 Correct 2 ms 10076 KB Output is correct
17 Correct 2 ms 10076 KB Output is correct
18 Correct 2 ms 10076 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 10076 KB Output is correct
2 Correct 2 ms 10076 KB Output is correct
3 Correct 2 ms 10076 KB Output is correct
4 Correct 3 ms 10076 KB Output is correct
5 Correct 2 ms 10076 KB Output is correct
6 Correct 2 ms 10076 KB Output is correct
7 Correct 2 ms 10076 KB Output is correct
8 Correct 2 ms 10076 KB Output is correct
9 Correct 2 ms 10076 KB Output is correct
10 Correct 2 ms 10076 KB Output is correct
11 Correct 2 ms 10076 KB Output is correct
12 Correct 2 ms 10260 KB Output is correct
13 Correct 2 ms 10076 KB Output is correct
14 Correct 2 ms 10076 KB Output is correct
15 Correct 2 ms 10076 KB Output is correct
16 Correct 2 ms 10076 KB Output is correct
17 Correct 2 ms 10076 KB Output is correct
18 Correct 2 ms 10076 KB Output is correct
19 Correct 2 ms 10076 KB Output is correct
20 Correct 2 ms 10284 KB Output is correct
21 Correct 3 ms 10332 KB Output is correct
22 Correct 5 ms 15708 KB Output is correct
23 Correct 5 ms 14428 KB Output is correct
24 Correct 5 ms 15964 KB Output is correct
25 Correct 5 ms 13660 KB Output is correct
26 Correct 4 ms 12892 KB Output is correct
27 Correct 2 ms 10332 KB Output is correct
28 Correct 4 ms 11868 KB Output is correct
29 Correct 4 ms 12840 KB Output is correct
30 Correct 4 ms 13148 KB Output is correct
31 Correct 4 ms 13916 KB Output is correct
32 Correct 4 ms 13916 KB Output is correct
33 Correct 5 ms 15708 KB Output is correct
34 Correct 5 ms 14684 KB Output is correct
35 Correct 5 ms 15964 KB Output is correct
36 Correct 5 ms 17244 KB Output is correct
37 Correct 4 ms 15192 KB Output is correct
38 Correct 4 ms 12632 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 10076 KB Output is correct
2 Correct 2 ms 10076 KB Output is correct
3 Correct 2 ms 10076 KB Output is correct
4 Correct 3 ms 10076 KB Output is correct
5 Correct 2 ms 10076 KB Output is correct
6 Correct 2 ms 10076 KB Output is correct
7 Correct 2 ms 10076 KB Output is correct
8 Correct 2 ms 10076 KB Output is correct
9 Correct 2 ms 10076 KB Output is correct
10 Correct 2 ms 10076 KB Output is correct
11 Correct 2 ms 10076 KB Output is correct
12 Correct 2 ms 10260 KB Output is correct
13 Correct 2 ms 10076 KB Output is correct
14 Correct 2 ms 10076 KB Output is correct
15 Correct 2 ms 10076 KB Output is correct
16 Correct 2 ms 10076 KB Output is correct
17 Correct 2 ms 10076 KB Output is correct
18 Correct 2 ms 10076 KB Output is correct
19 Correct 105 ms 14916 KB Output is correct
20 Correct 103 ms 15828 KB Output is correct
21 Correct 101 ms 15832 KB Output is correct
22 Correct 93 ms 16596 KB Output is correct
23 Correct 75 ms 16604 KB Output is correct
24 Correct 52 ms 16336 KB Output is correct
25 Correct 102 ms 18640 KB Output is correct
26 Correct 92 ms 21880 KB Output is correct
27 Correct 130 ms 23180 KB Output is correct
28 Correct 177 ms 34248 KB Output is correct
29 Correct 175 ms 33736 KB Output is correct
30 Correct 139 ms 23792 KB Output is correct
31 Correct 132 ms 24016 KB Output is correct
32 Correct 136 ms 23756 KB Output is correct
33 Correct 166 ms 22796 KB Output is correct
34 Correct 148 ms 23244 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 10076 KB Output is correct
2 Correct 2 ms 10076 KB Output is correct
3 Correct 2 ms 10076 KB Output is correct
4 Correct 3 ms 10076 KB Output is correct
5 Correct 2 ms 10076 KB Output is correct
6 Correct 2 ms 10076 KB Output is correct
7 Correct 2 ms 10076 KB Output is correct
8 Correct 2 ms 10076 KB Output is correct
9 Correct 2 ms 10076 KB Output is correct
10 Correct 2 ms 10076 KB Output is correct
11 Correct 2 ms 10076 KB Output is correct
12 Correct 2 ms 10260 KB Output is correct
13 Correct 2 ms 10076 KB Output is correct
14 Correct 2 ms 10076 KB Output is correct
15 Correct 2 ms 10076 KB Output is correct
16 Correct 2 ms 10076 KB Output is correct
17 Correct 2 ms 10076 KB Output is correct
18 Correct 2 ms 10076 KB Output is correct
19 Correct 2 ms 10076 KB Output is correct
20 Correct 2 ms 10284 KB Output is correct
21 Correct 3 ms 10332 KB Output is correct
22 Correct 5 ms 15708 KB Output is correct
23 Correct 5 ms 14428 KB Output is correct
24 Correct 5 ms 15964 KB Output is correct
25 Correct 5 ms 13660 KB Output is correct
26 Correct 4 ms 12892 KB Output is correct
27 Correct 2 ms 10332 KB Output is correct
28 Correct 4 ms 11868 KB Output is correct
29 Correct 4 ms 12840 KB Output is correct
30 Correct 4 ms 13148 KB Output is correct
31 Correct 4 ms 13916 KB Output is correct
32 Correct 4 ms 13916 KB Output is correct
33 Correct 5 ms 15708 KB Output is correct
34 Correct 5 ms 14684 KB Output is correct
35 Correct 5 ms 15964 KB Output is correct
36 Correct 5 ms 17244 KB Output is correct
37 Correct 4 ms 15192 KB Output is correct
38 Correct 4 ms 12632 KB Output is correct
39 Correct 105 ms 14916 KB Output is correct
40 Correct 103 ms 15828 KB Output is correct
41 Correct 101 ms 15832 KB Output is correct
42 Correct 93 ms 16596 KB Output is correct
43 Correct 75 ms 16604 KB Output is correct
44 Correct 52 ms 16336 KB Output is correct
45 Correct 102 ms 18640 KB Output is correct
46 Correct 92 ms 21880 KB Output is correct
47 Correct 130 ms 23180 KB Output is correct
48 Correct 177 ms 34248 KB Output is correct
49 Correct 175 ms 33736 KB Output is correct
50 Correct 139 ms 23792 KB Output is correct
51 Correct 132 ms 24016 KB Output is correct
52 Correct 136 ms 23756 KB Output is correct
53 Correct 166 ms 22796 KB Output is correct
54 Correct 148 ms 23244 KB Output is correct
55 Correct 9 ms 10844 KB Output is correct
56 Correct 10 ms 10824 KB Output is correct
57 Correct 84 ms 15840 KB Output is correct
58 Correct 43 ms 16328 KB Output is correct
59 Correct 93 ms 22740 KB Output is correct
60 Correct 269 ms 40368 KB Output is correct
61 Correct 130 ms 23244 KB Output is correct
62 Correct 146 ms 23756 KB Output is correct
63 Correct 175 ms 23760 KB Output is correct
64 Correct 269 ms 25536 KB Output is correct
65 Correct 135 ms 24820 KB Output is correct
66 Correct 266 ms 37516 KB Output is correct
67 Correct 89 ms 25940 KB Output is correct
68 Correct 171 ms 30396 KB Output is correct
69 Correct 171 ms 28196 KB Output is correct
70 Correct 163 ms 30072 KB Output is correct