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답안 #524744

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
524744 2022-02-09T23:32:13 Z perchuts Network (BOI15_net) C++17
100 / 100
 395 ms 47684 KB 
#include <bits/stdc++.h>
#define maxn (int)(1e5+51)
#define all(x) x.begin(), x.end()
#define sz(x) (int) x.size()
#define endl '\n'
#define ll long long
#define pb push_back
#define ull unsigned long long
#define ii pair<int,int>
#define iii tuple<int,int,int>
#define inf 2000000001
#define mod 1000000007 //998244353
#define _ ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);

using namespace std;

template<typename X, typename Y> bool ckmin(X& x, const Y& y) { return (y < x) ? (x=y,1):0; }
template<typename X, typename Y> bool ckmax(X& x, const Y& y) { return (x < y) ? (x=y,1):0; }
vector<int>g[5*maxn];
vector<int>leaves;
void dfs(int x,int p){
    int ok = 0;
    for(auto v:g[x]){
        if(v==p)continue;
        ok = 1;
        dfs(v,x);
    }
    if(!ok||(x==1&&sz(g[x])==1))leaves.pb(x);
}
int main(){_
    int n;cin>>n;
    for(int i=1;i<n;i++){
        int a,b;cin>>a>>b;
        g[a].pb(b);
        g[b].pb(a);
    }    
    dfs(1,1);
    int x = sz(leaves);
    cout<<(x+1)/2<<endl;
    for(int i=0;i<x/2;i++)cout<<leaves[i]<<" "<<leaves[i+x/2]<<endl;
    if(x&1){
        cout<<leaves[0]<<" "<<leaves[x-1]<<endl;
    }
}

Subtask #1
18.0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 11980 KB Output is correct
2 Correct 6 ms 12024 KB Output is correct
3 Correct 7 ms 11960 KB Output is correct
4 Correct 6 ms 12000 KB Output is correct
5 Correct 6 ms 11980 KB Output is correct
6 Correct 6 ms 11980 KB Output is correct
7 Correct 6 ms 11980 KB Output is correct
8 Correct 6 ms 11980 KB Output is correct
9 Correct 6 ms 11980 KB Output is correct
10 Correct 8 ms 11980 KB Output is correct
11 Correct 7 ms 11980 KB Output is correct
12 Correct 6 ms 11980 KB Output is correct
13 Correct 6 ms 12056 KB Output is correct
14 Correct 6 ms 11980 KB Output is correct
15 Correct 7 ms 11952 KB Output is correct
16 Correct 6 ms 11980 KB Output is correct
17 Correct 6 ms 11980 KB Output is correct
18 Correct 6 ms 11980 KB Output is correct
19 Correct 6 ms 11980 KB Output is correct
20 Correct 6 ms 11980 KB Output is correct

Subtask #2
45.0 / 45.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 11980 KB Output is correct
2 Correct 6 ms 12024 KB Output is correct
3 Correct 7 ms 11960 KB Output is correct
4 Correct 6 ms 12000 KB Output is correct
5 Correct 6 ms 11980 KB Output is correct
6 Correct 6 ms 11980 KB Output is correct
7 Correct 6 ms 11980 KB Output is correct
8 Correct 6 ms 11980 KB Output is correct
9 Correct 6 ms 11980 KB Output is correct
10 Correct 8 ms 11980 KB Output is correct
11 Correct 7 ms 11980 KB Output is correct
12 Correct 6 ms 11980 KB Output is correct
13 Correct 6 ms 12056 KB Output is correct
14 Correct 6 ms 11980 KB Output is correct
15 Correct 7 ms 11952 KB Output is correct
16 Correct 6 ms 11980 KB Output is correct
17 Correct 6 ms 11980 KB Output is correct
18 Correct 6 ms 11980 KB Output is correct
19 Correct 6 ms 11980 KB Output is correct
20 Correct 6 ms 11980 KB Output is correct
21 Correct 6 ms 11980 KB Output is correct
22 Correct 7 ms 12120 KB Output is correct
23 Correct 7 ms 12108 KB Output is correct
24 Correct 7 ms 12108 KB Output is correct
25 Correct 7 ms 12108 KB Output is correct
26 Correct 6 ms 12024 KB Output is correct
27 Correct 7 ms 12108 KB Output is correct
28 Correct 7 ms 12108 KB Output is correct
29 Correct 7 ms 12108 KB Output is correct
30 Correct 6 ms 11980 KB Output is correct
31 Correct 7 ms 12108 KB Output is correct
32 Correct 6 ms 12012 KB Output is correct
33 Correct 6 ms 12012 KB Output is correct
34 Correct 6 ms 11980 KB Output is correct
35 Correct 6 ms 11980 KB Output is correct
36 Correct 6 ms 11980 KB Output is correct
37 Correct 6 ms 11980 KB Output is correct
38 Correct 7 ms 12108 KB Output is correct
39 Correct 7 ms 12108 KB Output is correct
40 Correct 6 ms 11980 KB Output is correct
41 Correct 6 ms 11980 KB Output is correct
42 Correct 6 ms 11980 KB Output is correct
43 Correct 6 ms 12068 KB Output is correct
44 Correct 6 ms 11964 KB Output is correct
45 Correct 7 ms 12060 KB Output is correct
46 Correct 7 ms 12036 KB Output is correct
47 Correct 6 ms 11980 KB Output is correct
48 Correct 7 ms 12004 KB Output is correct
49 Correct 6 ms 12068 KB Output is correct
50 Correct 6 ms 11980 KB Output is correct
51 Correct 6 ms 12056 KB Output is correct
52 Correct 6 ms 11980 KB Output is correct
53 Correct 6 ms 12108 KB Output is correct
54 Correct 6 ms 12060 KB Output is correct
55 Correct 8 ms 11980 KB Output is correct
56 Correct 7 ms 11980 KB Output is correct
57 Correct 7 ms 12076 KB Output is correct
58 Correct 7 ms 12108 KB Output is correct

Subtask #3
37.0 / 37.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 11980 KB Output is correct
2 Correct 6 ms 12024 KB Output is correct
3 Correct 7 ms 11960 KB Output is correct
4 Correct 6 ms 12000 KB Output is correct
5 Correct 6 ms 11980 KB Output is correct
6 Correct 6 ms 11980 KB Output is correct
7 Correct 6 ms 11980 KB Output is correct
8 Correct 6 ms 11980 KB Output is correct
9 Correct 6 ms 11980 KB Output is correct
10 Correct 8 ms 11980 KB Output is correct
11 Correct 7 ms 11980 KB Output is correct
12 Correct 6 ms 11980 KB Output is correct
13 Correct 6 ms 12056 KB Output is correct
14 Correct 6 ms 11980 KB Output is correct
15 Correct 7 ms 11952 KB Output is correct
16 Correct 6 ms 11980 KB Output is correct
17 Correct 6 ms 11980 KB Output is correct
18 Correct 6 ms 11980 KB Output is correct
19 Correct 6 ms 11980 KB Output is correct
20 Correct 6 ms 11980 KB Output is correct
21 Correct 6 ms 11980 KB Output is correct
22 Correct 7 ms 12120 KB Output is correct
23 Correct 7 ms 12108 KB Output is correct
24 Correct 7 ms 12108 KB Output is correct
25 Correct 7 ms 12108 KB Output is correct
26 Correct 6 ms 12024 KB Output is correct
27 Correct 7 ms 12108 KB Output is correct
28 Correct 7 ms 12108 KB Output is correct
29 Correct 7 ms 12108 KB Output is correct
30 Correct 6 ms 11980 KB Output is correct
31 Correct 7 ms 12108 KB Output is correct
32 Correct 6 ms 12012 KB Output is correct
33 Correct 6 ms 12012 KB Output is correct
34 Correct 6 ms 11980 KB Output is correct
35 Correct 6 ms 11980 KB Output is correct
36 Correct 6 ms 11980 KB Output is correct
37 Correct 6 ms 11980 KB Output is correct
38 Correct 7 ms 12108 KB Output is correct
39 Correct 7 ms 12108 KB Output is correct
40 Correct 6 ms 11980 KB Output is correct
41 Correct 6 ms 11980 KB Output is correct
42 Correct 6 ms 11980 KB Output is correct
43 Correct 6 ms 12068 KB Output is correct
44 Correct 6 ms 11964 KB Output is correct
45 Correct 7 ms 12060 KB Output is correct
46 Correct 7 ms 12036 KB Output is correct
47 Correct 6 ms 11980 KB Output is correct
48 Correct 7 ms 12004 KB Output is correct
49 Correct 6 ms 12068 KB Output is correct
50 Correct 6 ms 11980 KB Output is correct
51 Correct 6 ms 12056 KB Output is correct
52 Correct 6 ms 11980 KB Output is correct
53 Correct 6 ms 12108 KB Output is correct
54 Correct 6 ms 12060 KB Output is correct
55 Correct 8 ms 11980 KB Output is correct
56 Correct 7 ms 11980 KB Output is correct
57 Correct 7 ms 12076 KB Output is correct
58 Correct 7 ms 12108 KB Output is correct
59 Correct 274 ms 36028 KB Output is correct
60 Correct 335 ms 38712 KB Output is correct
61 Correct 6 ms 11980 KB Output is correct
62 Correct 7 ms 12060 KB Output is correct
63 Correct 239 ms 33476 KB Output is correct
64 Correct 8 ms 12364 KB Output is correct
65 Correct 14 ms 13864 KB Output is correct
66 Correct 104 ms 27904 KB Output is correct
67 Correct 384 ms 46884 KB Output is correct
68 Correct 395 ms 47684 KB Output is correct
69 Correct 12 ms 12816 KB Output is correct
70 Correct 69 ms 21280 KB Output is correct
71 Correct 234 ms 41796 KB Output is correct
72 Correct 245 ms 40712 KB Output is correct
73 Correct 65 ms 19012 KB Output is correct
74 Correct 349 ms 37808 KB Output is correct
75 Correct 24 ms 15264 KB Output is correct
76 Correct 240 ms 41496 KB Output is correct
77 Correct 235 ms 41560 KB Output is correct
78 Correct 26 ms 15268 KB Output is correct
79 Correct 384 ms 45096 KB Output is correct
80 Correct 8 ms 12236 KB Output is correct
81 Correct 80 ms 21308 KB Output is correct
82 Correct 296 ms 39612 KB Output is correct
83 Correct 348 ms 37648 KB Output is correct
84 Correct 346 ms 37668 KB Output is correct
85 Correct 351 ms 37744 KB Output is correct
86 Correct 337 ms 38760 KB Output is correct
87 Correct 333 ms 38672 KB Output is correct