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답안 #307462

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
307462 2020-09-28T07:51:46 Z talant117408 경주 (Race) (IOI11_race) C++17
100 / 100
 1259 ms 43384 KB 
#include "race.h"
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair <int, int> pii;
 
#define precision(n) fixed << setprecision(n)
#define pb push_back
#define ub upper_bound
#define lb lower_bound
#define mp make_pair
#define eps (double)1e-9
#define PI 2*acos(0.0)
#define endl "\n"
#define sz(v) (v).size()
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
#define do_not_disturb ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);

const int NN = 2e5+7;
vector <vector <pii>> graph(NN);
vector <int> dis(1e6+7, 2e9), dis2(1e6+7, 2e9);
vector <int> saizu(NN), vis(NN), par(NN), cnt(1e6+7);
int ans = 2e9, need;

void calculate(int v, int p, int dista, int val, int flag){
    if(dista > need) return;
    if(flag){
        cnt[dista]++;
        if(dis[dista] == 2e9){
            dis[dista] = val;
        }
        else if(dis[dista] >= val){
            dis2[dista] = dis[dista];
            dis[dista] = val;
        }
    }
    else{
        cnt[dista]--;
        if(dis[dista] == val){
            dis[dista] = dis2[dista];
            dis2[dista]  = 2e9;
        }
        else if(dis2[dista] == val){
            dis2[dista] = 2e9;
        }
    }
    for(auto to : graph[v]){
        if(!vis[to.first] && to.first != p){
            calculate(to.first, v, dista+to.second, val+1, flag);
        }
    }
}

void solve(int v, int p, int dista, int val){
    if(dista > need) return;
    if(cnt[need-dista]){
        ans = min(ans, val+dis[need-dista]);
    }
    for(auto to : graph[v]){
        if(!vis[to.first] && to.first != p){
            solve(to.first, v, dista+to.second, val+1);
        }
    }
}

void find_size(int v, int p = -1){
    if(vis[v]) return;
    saizu[v] = 1;

    for(auto to : graph[v]){
        if(to.first != p && !vis[to.first]){
            find_size(to.first, v);
            saizu[v] += saizu[to.first];
        }
    }
}

int find_centroid(int v, int p, int n){
    for(auto to : graph[v]){
        if(to.first != p && !vis[to.first]){
            if(!vis[to.first] && saizu[to.first] > n/2){
                return find_centroid(to.first, v, n);
            }
        }
    }
    return v;
}

void init_centroid(int v = 0, int p = -1){
    find_size(v);
    
    int c = find_centroid(v, -1, saizu[v]);
    vis[c] = 1;
    par[c] = p;
    calculate(c, par[c], 0, 0, 1);
    if(cnt[need]){
        ans = min(ans, dis[need]);
    }
    for(auto to : graph[c]){
        if(!vis[to.first]){
            calculate(to.first, c, to.second, 1, 0);
            solve(to.first, c, to.second, 1);
            calculate(to.first, c, to.second, 1, 1);
        }
    }
    calculate(c, par[c], 0, 0, 0);
    
    for(auto to : graph[c]){
        if(!vis[to.first]){
            init_centroid(to.first, c);
        }
    }
    vis[c] = 0;
}

int best_path(int n, int k, int h[][2], int l[]){
    int i;
    need = k;
    for(i = 0; i < n-1; i++){
        graph[h[i][0]].pb(mp(h[i][1], l[i]));
        graph[h[i][1]].pb(mp(h[i][0], l[i]));
    }
    
    init_centroid();
    
    return ans == 2e9 ? -1 : ans;
}
/*
11 12
0 1 3
0 2 4
2 3 5 
3 4 4
4 5 6 
0 6 3
6 7 2
6 8 5
8 9 6
8 10 7
2

4 3
0 1 1
1 2 2
1 3 4
2

3 3
0 1 1
1 2 1
-1
*/

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 19200 KB Output is correct
2 Correct 14 ms 19072 KB Output is correct
3 Correct 14 ms 19200 KB Output is correct
4 Correct 14 ms 19200 KB Output is correct
5 Correct 14 ms 19200 KB Output is correct
6 Correct 14 ms 19200 KB Output is correct
7 Correct 14 ms 19200 KB Output is correct
8 Correct 14 ms 19200 KB Output is correct
9 Correct 14 ms 19200 KB Output is correct
10 Correct 14 ms 19200 KB Output is correct
11 Correct 14 ms 19200 KB Output is correct
12 Correct 15 ms 19200 KB Output is correct
13 Correct 14 ms 19200 KB Output is correct
14 Correct 14 ms 19200 KB Output is correct
15 Correct 14 ms 19072 KB Output is correct
16 Correct 14 ms 19168 KB Output is correct
17 Correct 14 ms 19200 KB Output is correct
18 Correct 14 ms 19200 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 19200 KB Output is correct
2 Correct 14 ms 19072 KB Output is correct
3 Correct 14 ms 19200 KB Output is correct
4 Correct 14 ms 19200 KB Output is correct
5 Correct 14 ms 19200 KB Output is correct
6 Correct 14 ms 19200 KB Output is correct
7 Correct 14 ms 19200 KB Output is correct
8 Correct 14 ms 19200 KB Output is correct
9 Correct 14 ms 19200 KB Output is correct
10 Correct 14 ms 19200 KB Output is correct
11 Correct 14 ms 19200 KB Output is correct
12 Correct 15 ms 19200 KB Output is correct
13 Correct 14 ms 19200 KB Output is correct
14 Correct 14 ms 19200 KB Output is correct
15 Correct 14 ms 19072 KB Output is correct
16 Correct 14 ms 19168 KB Output is correct
17 Correct 14 ms 19200 KB Output is correct
18 Correct 14 ms 19200 KB Output is correct
19 Correct 14 ms 19072 KB Output is correct
20 Correct 15 ms 19072 KB Output is correct
21 Correct 15 ms 19200 KB Output is correct
22 Correct 15 ms 19200 KB Output is correct
23 Correct 15 ms 19200 KB Output is correct
24 Correct 15 ms 19200 KB Output is correct
25 Correct 16 ms 19200 KB Output is correct
26 Correct 15 ms 19200 KB Output is correct
27 Correct 14 ms 19200 KB Output is correct
28 Correct 15 ms 19200 KB Output is correct
29 Correct 16 ms 19200 KB Output is correct
30 Correct 16 ms 19200 KB Output is correct
31 Correct 16 ms 19200 KB Output is correct
32 Correct 16 ms 19328 KB Output is correct
33 Correct 16 ms 19232 KB Output is correct
34 Correct 15 ms 19200 KB Output is correct
35 Correct 15 ms 19200 KB Output is correct
36 Correct 15 ms 19232 KB Output is correct
37 Correct 15 ms 19200 KB Output is correct
38 Correct 15 ms 19200 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 19200 KB Output is correct
2 Correct 14 ms 19072 KB Output is correct
3 Correct 14 ms 19200 KB Output is correct
4 Correct 14 ms 19200 KB Output is correct
5 Correct 14 ms 19200 KB Output is correct
6 Correct 14 ms 19200 KB Output is correct
7 Correct 14 ms 19200 KB Output is correct
8 Correct 14 ms 19200 KB Output is correct
9 Correct 14 ms 19200 KB Output is correct
10 Correct 14 ms 19200 KB Output is correct
11 Correct 14 ms 19200 KB Output is correct
12 Correct 15 ms 19200 KB Output is correct
13 Correct 14 ms 19200 KB Output is correct
14 Correct 14 ms 19200 KB Output is correct
15 Correct 14 ms 19072 KB Output is correct
16 Correct 14 ms 19168 KB Output is correct
17 Correct 14 ms 19200 KB Output is correct
18 Correct 14 ms 19200 KB Output is correct
19 Correct 294 ms 24080 KB Output is correct
20 Correct 269 ms 23928 KB Output is correct
21 Correct 320 ms 24056 KB Output is correct
22 Correct 307 ms 24184 KB Output is correct
23 Correct 128 ms 24184 KB Output is correct
24 Correct 104 ms 24184 KB Output is correct
25 Correct 233 ms 26872 KB Output is correct
26 Correct 177 ms 31100 KB Output is correct
27 Correct 277 ms 31864 KB Output is correct
28 Correct 430 ms 43384 KB Output is correct
29 Correct 417 ms 42360 KB Output is correct
30 Correct 274 ms 31864 KB Output is correct
31 Correct 289 ms 31864 KB Output is correct
32 Correct 346 ms 31992 KB Output is correct
33 Correct 401 ms 30716 KB Output is correct
34 Correct 307 ms 31864 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 19200 KB Output is correct
2 Correct 14 ms 19072 KB Output is correct
3 Correct 14 ms 19200 KB Output is correct
4 Correct 14 ms 19200 KB Output is correct
5 Correct 14 ms 19200 KB Output is correct
6 Correct 14 ms 19200 KB Output is correct
7 Correct 14 ms 19200 KB Output is correct
8 Correct 14 ms 19200 KB Output is correct
9 Correct 14 ms 19200 KB Output is correct
10 Correct 14 ms 19200 KB Output is correct
11 Correct 14 ms 19200 KB Output is correct
12 Correct 15 ms 19200 KB Output is correct
13 Correct 14 ms 19200 KB Output is correct
14 Correct 14 ms 19200 KB Output is correct
15 Correct 14 ms 19072 KB Output is correct
16 Correct 14 ms 19168 KB Output is correct
17 Correct 14 ms 19200 KB Output is correct
18 Correct 14 ms 19200 KB Output is correct
19 Correct 14 ms 19072 KB Output is correct
20 Correct 15 ms 19072 KB Output is correct
21 Correct 15 ms 19200 KB Output is correct
22 Correct 15 ms 19200 KB Output is correct
23 Correct 15 ms 19200 KB Output is correct
24 Correct 15 ms 19200 KB Output is correct
25 Correct 16 ms 19200 KB Output is correct
26 Correct 15 ms 19200 KB Output is correct
27 Correct 14 ms 19200 KB Output is correct
28 Correct 15 ms 19200 KB Output is correct
29 Correct 16 ms 19200 KB Output is correct
30 Correct 16 ms 19200 KB Output is correct
31 Correct 16 ms 19200 KB Output is correct
32 Correct 16 ms 19328 KB Output is correct
33 Correct 16 ms 19232 KB Output is correct
34 Correct 15 ms 19200 KB Output is correct
35 Correct 15 ms 19200 KB Output is correct
36 Correct 15 ms 19232 KB Output is correct
37 Correct 15 ms 19200 KB Output is correct
38 Correct 15 ms 19200 KB Output is correct
39 Correct 294 ms 24080 KB Output is correct
40 Correct 269 ms 23928 KB Output is correct
41 Correct 320 ms 24056 KB Output is correct
42 Correct 307 ms 24184 KB Output is correct
43 Correct 128 ms 24184 KB Output is correct
44 Correct 104 ms 24184 KB Output is correct
45 Correct 233 ms 26872 KB Output is correct
46 Correct 177 ms 31100 KB Output is correct
47 Correct 277 ms 31864 KB Output is correct
48 Correct 430 ms 43384 KB Output is correct
49 Correct 417 ms 42360 KB Output is correct
50 Correct 274 ms 31864 KB Output is correct
51 Correct 289 ms 31864 KB Output is correct
52 Correct 346 ms 31992 KB Output is correct
53 Correct 401 ms 30716 KB Output is correct
54 Correct 307 ms 31864 KB Output is correct
55 Correct 28 ms 19712 KB Output is correct
56 Correct 32 ms 19712 KB Output is correct
57 Correct 173 ms 25616 KB Output is correct
58 Correct 63 ms 25452 KB Output is correct
59 Correct 200 ms 31096 KB Output is correct
60 Correct 1066 ms 42648 KB Output is correct
61 Correct 324 ms 32120 KB Output is correct
62 Correct 371 ms 31992 KB Output is correct
63 Correct 541 ms 32120 KB Output is correct
64 Correct 1259 ms 32376 KB Output is correct
65 Correct 357 ms 33144 KB Output is correct
66 Correct 853 ms 40568 KB Output is correct
67 Correct 201 ms 32744 KB Output is correct
68 Correct 555 ms 32888 KB Output is correct
69 Correct 550 ms 33016 KB Output is correct
70 Correct 512 ms 32376 KB Output is correct