oj.uz

답안 #922723

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
922723 2024-02-06T04:18:38 Z Alihan_8 Network (BOI15_net) C++17
100 / 100
 438 ms 47056 KB 
#include <bits/stdc++.h>

using namespace std;

#define all(x) x.begin(), x.end()
#define ar array
#define pb push_back
#define ln '\n'
#define int long long

using i64 = long long;

template <class F, class _S>
bool chmin(F &u, const _S &v){
    bool flag = false;
    if ( u > v ){
        u = v; flag |= true;
    }
    return flag;
}

template <class F, class _S>
bool chmax(F &u, const _S &v){
    bool flag = false;
    if ( u < v ){
        u = v; flag |= true;
    }
    return flag;
}

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int n; cin >> n;

    vector <vector<int>> G(n);

    for ( int i = 1; i < n; i++ ){
        int u, v; cin >> u >> v;
        --u, --v;
        G[u].pb(v), G[v].pb(u);
    }

    vector <int> lf;

    auto dfs = [&](auto dfs, int u, int p) -> void{
        for ( auto &v: G[u] ){
            if ( v != p ){
                dfs(dfs, v, u);
            }
        }
        if ( G[u].size() == 1 ){
            lf.pb(u);
        }
    };

    dfs(dfs, 0, -1);

    if ( lf.size() & 1 ){
        lf.pb(lf[0]);
    }

    int k = lf.size();
    cout << k / 2 << ln;
    for ( int i = 0; i * 2 < k; i++ ){
        cout << lf[i] + 1 << ' ' << lf[i + k / 2] + 1 << ln;
    }

    cout << '\n';
}

Subtask #1
18.0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 460 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 344 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 460 KB Output is correct
14 Correct 1 ms 604 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct

Subtask #2
45.0 / 45.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 460 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 344 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 460 KB Output is correct
14 Correct 1 ms 604 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 1 ms 604 KB Output is correct
23 Correct 1 ms 468 KB Output is correct
24 Correct 1 ms 612 KB Output is correct
25 Correct 1 ms 604 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 1 ms 856 KB Output is correct
28 Correct 1 ms 604 KB Output is correct
29 Correct 1 ms 348 KB Output is correct
30 Correct 0 ms 348 KB Output is correct
31 Correct 2 ms 604 KB Output is correct
32 Correct 1 ms 344 KB Output is correct
33 Correct 0 ms 348 KB Output is correct
34 Correct 0 ms 544 KB Output is correct
35 Correct 1 ms 348 KB Output is correct
36 Correct 0 ms 604 KB Output is correct
37 Correct 0 ms 456 KB Output is correct
38 Correct 1 ms 348 KB Output is correct
39 Correct 0 ms 456 KB Output is correct
40 Correct 0 ms 452 KB Output is correct
41 Correct 0 ms 348 KB Output is correct
42 Correct 0 ms 348 KB Output is correct
43 Correct 1 ms 348 KB Output is correct
44 Correct 0 ms 348 KB Output is correct
45 Correct 1 ms 348 KB Output is correct
46 Correct 1 ms 456 KB Output is correct
47 Correct 0 ms 348 KB Output is correct
48 Correct 0 ms 348 KB Output is correct
49 Correct 1 ms 348 KB Output is correct
50 Correct 0 ms 344 KB Output is correct
51 Correct 0 ms 348 KB Output is correct
52 Correct 1 ms 348 KB Output is correct
53 Correct 1 ms 348 KB Output is correct
54 Correct 0 ms 348 KB Output is correct
55 Correct 1 ms 456 KB Output is correct
56 Correct 0 ms 348 KB Output is correct
57 Correct 1 ms 348 KB Output is correct
58 Correct 1 ms 604 KB Output is correct

Subtask #3
37.0 / 37.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 460 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 344 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 460 KB Output is correct
14 Correct 1 ms 604 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 1 ms 604 KB Output is correct
23 Correct 1 ms 468 KB Output is correct
24 Correct 1 ms 612 KB Output is correct
25 Correct 1 ms 604 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 1 ms 856 KB Output is correct
28 Correct 1 ms 604 KB Output is correct
29 Correct 1 ms 348 KB Output is correct
30 Correct 0 ms 348 KB Output is correct
31 Correct 2 ms 604 KB Output is correct
32 Correct 1 ms 344 KB Output is correct
33 Correct 0 ms 348 KB Output is correct
34 Correct 0 ms 544 KB Output is correct
35 Correct 1 ms 348 KB Output is correct
36 Correct 0 ms 604 KB Output is correct
37 Correct 0 ms 456 KB Output is correct
38 Correct 1 ms 348 KB Output is correct
39 Correct 0 ms 456 KB Output is correct
40 Correct 0 ms 452 KB Output is correct
41 Correct 0 ms 348 KB Output is correct
42 Correct 0 ms 348 KB Output is correct
43 Correct 1 ms 348 KB Output is correct
44 Correct 0 ms 348 KB Output is correct
45 Correct 1 ms 348 KB Output is correct
46 Correct 1 ms 456 KB Output is correct
47 Correct 0 ms 348 KB Output is correct
48 Correct 0 ms 348 KB Output is correct
49 Correct 1 ms 348 KB Output is correct
50 Correct 0 ms 344 KB Output is correct
51 Correct 0 ms 348 KB Output is correct
52 Correct 1 ms 348 KB Output is correct
53 Correct 1 ms 348 KB Output is correct
54 Correct 0 ms 348 KB Output is correct
55 Correct 1 ms 456 KB Output is correct
56 Correct 0 ms 348 KB Output is correct
57 Correct 1 ms 348 KB Output is correct
58 Correct 1 ms 604 KB Output is correct
59 Correct 293 ms 40644 KB Output is correct
60 Correct 333 ms 43516 KB Output is correct
61 Correct 0 ms 456 KB Output is correct
62 Correct 1 ms 600 KB Output is correct
63 Correct 237 ms 35140 KB Output is correct
64 Correct 2 ms 860 KB Output is correct
65 Correct 7 ms 2652 KB Output is correct
66 Correct 81 ms 19712 KB Output is correct
67 Correct 354 ms 45432 KB Output is correct
68 Correct 331 ms 47056 KB Output is correct
69 Correct 4 ms 1688 KB Output is correct
70 Correct 47 ms 15684 KB Output is correct
71 Correct 204 ms 45916 KB Output is correct
72 Correct 257 ms 44552 KB Output is correct
73 Correct 42 ms 11720 KB Output is correct
74 Correct 308 ms 41152 KB Output is correct
75 Correct 14 ms 5332 KB Output is correct
76 Correct 239 ms 45484 KB Output is correct
77 Correct 260 ms 45484 KB Output is correct
78 Correct 22 ms 5204 KB Output is correct
79 Correct 438 ms 44000 KB Output is correct
80 Correct 2 ms 676 KB Output is correct
81 Correct 60 ms 14888 KB Output is correct
82 Correct 270 ms 43296 KB Output is correct
83 Correct 353 ms 41096 KB Output is correct
84 Correct 371 ms 41316 KB Output is correct
85 Correct 359 ms 41172 KB Output is correct
86 Correct 356 ms 43452 KB Output is correct
87 Correct 391 ms 44592 KB Output is correct