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Submission #394707

# Submission time Handle Problem Language Result Execution time Memory
394707 2021-04-27T07:48:19 Z Parsa_PG Network (BOI15_net) C++14
100 / 100
 693 ms 65360 KB 
/* Man BINAHAYATO Mikham */
#include <bits/stdc++.h>
     
#define pb push_back
#define endl "\n"
#define ll long long
 
using namespace std;
 
const int maxn = 1e6 + 10, Maxn = 1e5 + 10, SQ = 360 , lg = 22 ; 
const int mod = 1e9 + 7;
const long long inf = 1e18 + 10;

int sum[maxn], maxx[maxn], cnt, root;
vector<int> adj[maxn], vec;

void find_root(int v, int par){
        for(auto u: adj[v]){
                if(u == par)
                        continue;
                find_root(u, v);
                sum[v] += sum[u];
                maxx[v] = max(maxx[v], sum[u]);
        }
        maxx[v] = max(maxx[v], cnt - sum[v]);
        if(maxx[v] <= cnt/2)
                root = v;
}

void dfs(int v, int par){
        if(adj[v].size() == 1)
                vec.pb(v);
        for(auto u : adj[v])
                if(par != u)
                        dfs(u, v);
}

int32_t main(){
        ios:: sync_with_stdio(0), cin.tie(0), cout.tie(0);
        int n;
        cin >> n;
        for(int i = 0 ; i < n - 1 ; i++){
                int u, v;
                cin >> u >> v;
                u--, v--;
                adj[u].pb(v);
                adj[v].pb(u);
        }
        for(int i = 0 ; i < n ; i++)
                if(adj[i].size() == 1)
                        cnt++;
        find_root(0, -1);
        dfs(root, -1);
        int x = cnt/2;
        cout << (cnt + 1)/2 << endl;
        for(int i = 0 ; i < (cnt + 1)/2 ; i++){
                cout << vec[i] + 1 << ' ' << vec[min(cnt - 1, i + x)] + 1 << endl;
        }
        return 0;
}

Subtask #1
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 23756 KB Output is correct
2 Correct 17 ms 23808 KB Output is correct
3 Correct 15 ms 23756 KB Output is correct
4 Correct 15 ms 23696 KB Output is correct
5 Correct 15 ms 23812 KB Output is correct
6 Correct 15 ms 23760 KB Output is correct
7 Correct 16 ms 23808 KB Output is correct
8 Correct 16 ms 23784 KB Output is correct
9 Correct 15 ms 23736 KB Output is correct
10 Correct 15 ms 23804 KB Output is correct
11 Correct 17 ms 23808 KB Output is correct
12 Correct 18 ms 23756 KB Output is correct
13 Correct 17 ms 23756 KB Output is correct
14 Correct 15 ms 23712 KB Output is correct
15 Correct 16 ms 23732 KB Output is correct
16 Correct 16 ms 23692 KB Output is correct
17 Correct 15 ms 23692 KB Output is correct
18 Correct 16 ms 23812 KB Output is correct
19 Correct 15 ms 23756 KB Output is correct
20 Correct 16 ms 23760 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 23756 KB Output is correct
2 Correct 17 ms 23808 KB Output is correct
3 Correct 15 ms 23756 KB Output is correct
4 Correct 15 ms 23696 KB Output is correct
5 Correct 15 ms 23812 KB Output is correct
6 Correct 15 ms 23760 KB Output is correct
7 Correct 16 ms 23808 KB Output is correct
8 Correct 16 ms 23784 KB Output is correct
9 Correct 15 ms 23736 KB Output is correct
10 Correct 15 ms 23804 KB Output is correct
11 Correct 17 ms 23808 KB Output is correct
12 Correct 18 ms 23756 KB Output is correct
13 Correct 17 ms 23756 KB Output is correct
14 Correct 15 ms 23712 KB Output is correct
15 Correct 16 ms 23732 KB Output is correct
16 Correct 16 ms 23692 KB Output is correct
17 Correct 15 ms 23692 KB Output is correct
18 Correct 16 ms 23812 KB Output is correct
19 Correct 15 ms 23756 KB Output is correct
20 Correct 16 ms 23760 KB Output is correct
21 Correct 15 ms 23756 KB Output is correct
22 Correct 16 ms 24012 KB Output is correct
23 Correct 17 ms 23920 KB Output is correct
24 Correct 19 ms 23884 KB Output is correct
25 Correct 16 ms 23856 KB Output is correct
26 Correct 17 ms 23888 KB Output is correct
27 Correct 18 ms 23884 KB Output is correct
28 Correct 16 ms 23920 KB Output is correct
29 Correct 16 ms 23884 KB Output is correct
30 Correct 15 ms 23756 KB Output is correct
31 Correct 16 ms 23816 KB Output is correct
32 Correct 16 ms 23776 KB Output is correct
33 Correct 16 ms 23684 KB Output is correct
34 Correct 16 ms 23756 KB Output is correct
35 Correct 16 ms 23756 KB Output is correct
36 Correct 18 ms 23800 KB Output is correct
37 Correct 16 ms 23756 KB Output is correct
38 Correct 16 ms 23884 KB Output is correct
39 Correct 15 ms 23800 KB Output is correct
40 Correct 15 ms 23696 KB Output is correct
41 Correct 15 ms 23756 KB Output is correct
42 Correct 16 ms 23836 KB Output is correct
43 Correct 16 ms 23792 KB Output is correct
44 Correct 15 ms 23808 KB Output is correct
45 Correct 15 ms 23756 KB Output is correct
46 Correct 16 ms 23888 KB Output is correct
47 Correct 15 ms 23688 KB Output is correct
48 Correct 15 ms 23832 KB Output is correct
49 Correct 16 ms 23760 KB Output is correct
50 Correct 15 ms 23700 KB Output is correct
51 Correct 17 ms 23756 KB Output is correct
52 Correct 14 ms 23756 KB Output is correct
53 Correct 16 ms 23812 KB Output is correct
54 Correct 15 ms 23732 KB Output is correct
55 Correct 16 ms 23748 KB Output is correct
56 Correct 16 ms 23804 KB Output is correct
57 Correct 15 ms 23740 KB Output is correct
58 Correct 16 ms 23940 KB Output is correct

Subtask #3
37.0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 23756 KB Output is correct
2 Correct 17 ms 23808 KB Output is correct
3 Correct 15 ms 23756 KB Output is correct
4 Correct 15 ms 23696 KB Output is correct
5 Correct 15 ms 23812 KB Output is correct
6 Correct 15 ms 23760 KB Output is correct
7 Correct 16 ms 23808 KB Output is correct
8 Correct 16 ms 23784 KB Output is correct
9 Correct 15 ms 23736 KB Output is correct
10 Correct 15 ms 23804 KB Output is correct
11 Correct 17 ms 23808 KB Output is correct
12 Correct 18 ms 23756 KB Output is correct
13 Correct 17 ms 23756 KB Output is correct
14 Correct 15 ms 23712 KB Output is correct
15 Correct 16 ms 23732 KB Output is correct
16 Correct 16 ms 23692 KB Output is correct
17 Correct 15 ms 23692 KB Output is correct
18 Correct 16 ms 23812 KB Output is correct
19 Correct 15 ms 23756 KB Output is correct
20 Correct 16 ms 23760 KB Output is correct
21 Correct 15 ms 23756 KB Output is correct
22 Correct 16 ms 24012 KB Output is correct
23 Correct 17 ms 23920 KB Output is correct
24 Correct 19 ms 23884 KB Output is correct
25 Correct 16 ms 23856 KB Output is correct
26 Correct 17 ms 23888 KB Output is correct
27 Correct 18 ms 23884 KB Output is correct
28 Correct 16 ms 23920 KB Output is correct
29 Correct 16 ms 23884 KB Output is correct
30 Correct 15 ms 23756 KB Output is correct
31 Correct 16 ms 23816 KB Output is correct
32 Correct 16 ms 23776 KB Output is correct
33 Correct 16 ms 23684 KB Output is correct
34 Correct 16 ms 23756 KB Output is correct
35 Correct 16 ms 23756 KB Output is correct
36 Correct 18 ms 23800 KB Output is correct
37 Correct 16 ms 23756 KB Output is correct
38 Correct 16 ms 23884 KB Output is correct
39 Correct 15 ms 23800 KB Output is correct
40 Correct 15 ms 23696 KB Output is correct
41 Correct 15 ms 23756 KB Output is correct
42 Correct 16 ms 23836 KB Output is correct
43 Correct 16 ms 23792 KB Output is correct
44 Correct 15 ms 23808 KB Output is correct
45 Correct 15 ms 23756 KB Output is correct
46 Correct 16 ms 23888 KB Output is correct
47 Correct 15 ms 23688 KB Output is correct
48 Correct 15 ms 23832 KB Output is correct
49 Correct 16 ms 23760 KB Output is correct
50 Correct 15 ms 23700 KB Output is correct
51 Correct 17 ms 23756 KB Output is correct
52 Correct 14 ms 23756 KB Output is correct
53 Correct 16 ms 23812 KB Output is correct
54 Correct 15 ms 23732 KB Output is correct
55 Correct 16 ms 23748 KB Output is correct
56 Correct 16 ms 23804 KB Output is correct
57 Correct 15 ms 23740 KB Output is correct
58 Correct 16 ms 23940 KB Output is correct
59 Correct 508 ms 45240 KB Output is correct
60 Correct 553 ms 47796 KB Output is correct
61 Correct 16 ms 23756 KB Output is correct
62 Correct 15 ms 23756 KB Output is correct
63 Correct 412 ms 43136 KB Output is correct
64 Correct 18 ms 24268 KB Output is correct
65 Correct 29 ms 26092 KB Output is correct
66 Correct 194 ms 44240 KB Output is correct
67 Correct 693 ms 64280 KB Output is correct
68 Correct 648 ms 65360 KB Output is correct
69 Correct 22 ms 24652 KB Output is correct
70 Correct 110 ms 32192 KB Output is correct
71 Correct 361 ms 48948 KB Output is correct
72 Correct 405 ms 50096 KB Output is correct
73 Correct 128 ms 30152 KB Output is correct
74 Correct 602 ms 46616 KB Output is correct
75 Correct 41 ms 26820 KB Output is correct
76 Correct 398 ms 50468 KB Output is correct
77 Correct 366 ms 48816 KB Output is correct
78 Correct 45 ms 27332 KB Output is correct
79 Correct 663 ms 61476 KB Output is correct
80 Correct 17 ms 24012 KB Output is correct
81 Correct 155 ms 32292 KB Output is correct
82 Correct 458 ms 48776 KB Output is correct
83 Correct 600 ms 46696 KB Output is correct
84 Correct 549 ms 46644 KB Output is correct
85 Correct 546 ms 46712 KB Output is correct
86 Correct 549 ms 47704 KB Output is correct
87 Correct 627 ms 47820 KB Output is correct