oj.uz

Submission #831256

# Submission time Handle Problem Language Result Execution time Memory
831256 2023-08-20T02:46:00 Z Cookie Network (BOI15_net) C++14
100 / 100
 426 ms 49708 KB 
#include<bits/stdc++.h>
#include<fstream>
//#pragma GCC optimize("Ofast,O3,unroll-loops")
//#pragma GCC target("avx2")
using namespace std;
ifstream fin("palpath.in");
ofstream fout("palpath.out");
#define sz(a) (int)a.size()
#define ll long long
#define pb push_back
#define forr(i, a, b) for(int i = a; i < b; i++)
#define dorr(i, a, b) for(int i = a; i >= b; i--)
#define ld long double
#define vt vector
#include<fstream>
#define fi first
#define se second
#define pll pair<ll, ll>
#define pii pair<int, int>
 
const ll mod = 1e9 + 7;
const int mxn = 5e5 + 5, mxr = 25e3, sq = 500, mxv = 1e6 + 5, mxvv = 130, pr = 31, inf = 1e9;
int n;
int in[mxn + 1];
vt<int>leaf;
vt<int>adj[mxn + 1];
void dfs(int s, int pre){
    bool ok = 0;
    for(auto i: adj[s]){
        if(i != pre){
            dfs(i, s); ok = 1;
        }
    }
    if(!ok)leaf.pb(s);
}
int main(){
     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    cin >> n;
    for(int i = 1; i < n; i++){
        int u, v; cin >> u >> v;
        in[u]++; in[v]++;
        adj[u].pb(v); adj[v].pb(u);
    }
    for(int i = 1; i <= n; i++){
        if(in[i] > 1){
            dfs(i, -1);
            break;
        }
    }
    cout << ((sz(leaf) + 1) / 2) << "\n";
    for(int i = 0; i <= sz(leaf) / 2 - 1; i++){
        cout << leaf[i] << " " << leaf[i + sz(leaf) / 2] << "\n";
    }
    if(sz(leaf) & 1){
        cout << leaf[0] << " " << leaf.back();
    }
    return(0);
}

Subtask #1
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 11988 KB Output is correct
2 Correct 7 ms 12076 KB Output is correct
3 Correct 6 ms 12084 KB Output is correct
4 Correct 6 ms 11988 KB Output is correct
5 Correct 8 ms 12084 KB Output is correct
6 Correct 5 ms 12076 KB Output is correct
7 Correct 6 ms 12080 KB Output is correct
8 Correct 7 ms 11988 KB Output is correct
9 Correct 5 ms 11988 KB Output is correct
10 Correct 5 ms 11988 KB Output is correct
11 Correct 5 ms 12088 KB Output is correct
12 Correct 6 ms 11996 KB Output is correct
13 Correct 7 ms 11988 KB Output is correct
14 Correct 5 ms 12080 KB Output is correct
15 Correct 5 ms 11988 KB Output is correct
16 Correct 5 ms 11988 KB Output is correct
17 Correct 5 ms 11988 KB Output is correct
18 Correct 5 ms 11988 KB Output is correct
19 Correct 5 ms 11988 KB Output is correct
20 Correct 6 ms 12080 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 11988 KB Output is correct
2 Correct 7 ms 12076 KB Output is correct
3 Correct 6 ms 12084 KB Output is correct
4 Correct 6 ms 11988 KB Output is correct
5 Correct 8 ms 12084 KB Output is correct
6 Correct 5 ms 12076 KB Output is correct
7 Correct 6 ms 12080 KB Output is correct
8 Correct 7 ms 11988 KB Output is correct
9 Correct 5 ms 11988 KB Output is correct
10 Correct 5 ms 11988 KB Output is correct
11 Correct 5 ms 12088 KB Output is correct
12 Correct 6 ms 11996 KB Output is correct
13 Correct 7 ms 11988 KB Output is correct
14 Correct 5 ms 12080 KB Output is correct
15 Correct 5 ms 11988 KB Output is correct
16 Correct 5 ms 11988 KB Output is correct
17 Correct 5 ms 11988 KB Output is correct
18 Correct 5 ms 11988 KB Output is correct
19 Correct 5 ms 11988 KB Output is correct
20 Correct 6 ms 12080 KB Output is correct
21 Correct 8 ms 12080 KB Output is correct
22 Correct 7 ms 12092 KB Output is correct
23 Correct 7 ms 12116 KB Output is correct
24 Correct 9 ms 12096 KB Output is correct
25 Correct 8 ms 12116 KB Output is correct
26 Correct 7 ms 12116 KB Output is correct
27 Correct 6 ms 12160 KB Output is correct
28 Correct 5 ms 12116 KB Output is correct
29 Correct 6 ms 12116 KB Output is correct
30 Correct 7 ms 12084 KB Output is correct
31 Correct 7 ms 12148 KB Output is correct
32 Correct 7 ms 11988 KB Output is correct
33 Correct 5 ms 11988 KB Output is correct
34 Correct 6 ms 12036 KB Output is correct
35 Correct 6 ms 11988 KB Output is correct
36 Correct 5 ms 12008 KB Output is correct
37 Correct 5 ms 12088 KB Output is correct
38 Correct 5 ms 12080 KB Output is correct
39 Correct 6 ms 11988 KB Output is correct
40 Correct 6 ms 11988 KB Output is correct
41 Correct 5 ms 12076 KB Output is correct
42 Correct 7 ms 11988 KB Output is correct
43 Correct 5 ms 12116 KB Output is correct
44 Correct 7 ms 12080 KB Output is correct
45 Correct 5 ms 11988 KB Output is correct
46 Correct 7 ms 12116 KB Output is correct
47 Correct 6 ms 12076 KB Output is correct
48 Correct 5 ms 12052 KB Output is correct
49 Correct 6 ms 12116 KB Output is correct
50 Correct 5 ms 12080 KB Output is correct
51 Correct 6 ms 11988 KB Output is correct
52 Correct 8 ms 11988 KB Output is correct
53 Correct 6 ms 12116 KB Output is correct
54 Correct 5 ms 11988 KB Output is correct
55 Correct 5 ms 12088 KB Output is correct
56 Correct 6 ms 12076 KB Output is correct
57 Correct 7 ms 11988 KB Output is correct
58 Correct 9 ms 12092 KB Output is correct

Subtask #3
37.0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 11988 KB Output is correct
2 Correct 7 ms 12076 KB Output is correct
3 Correct 6 ms 12084 KB Output is correct
4 Correct 6 ms 11988 KB Output is correct
5 Correct 8 ms 12084 KB Output is correct
6 Correct 5 ms 12076 KB Output is correct
7 Correct 6 ms 12080 KB Output is correct
8 Correct 7 ms 11988 KB Output is correct
9 Correct 5 ms 11988 KB Output is correct
10 Correct 5 ms 11988 KB Output is correct
11 Correct 5 ms 12088 KB Output is correct
12 Correct 6 ms 11996 KB Output is correct
13 Correct 7 ms 11988 KB Output is correct
14 Correct 5 ms 12080 KB Output is correct
15 Correct 5 ms 11988 KB Output is correct
16 Correct 5 ms 11988 KB Output is correct
17 Correct 5 ms 11988 KB Output is correct
18 Correct 5 ms 11988 KB Output is correct
19 Correct 5 ms 11988 KB Output is correct
20 Correct 6 ms 12080 KB Output is correct
21 Correct 8 ms 12080 KB Output is correct
22 Correct 7 ms 12092 KB Output is correct
23 Correct 7 ms 12116 KB Output is correct
24 Correct 9 ms 12096 KB Output is correct
25 Correct 8 ms 12116 KB Output is correct
26 Correct 7 ms 12116 KB Output is correct
27 Correct 6 ms 12160 KB Output is correct
28 Correct 5 ms 12116 KB Output is correct
29 Correct 6 ms 12116 KB Output is correct
30 Correct 7 ms 12084 KB Output is correct
31 Correct 7 ms 12148 KB Output is correct
32 Correct 7 ms 11988 KB Output is correct
33 Correct 5 ms 11988 KB Output is correct
34 Correct 6 ms 12036 KB Output is correct
35 Correct 6 ms 11988 KB Output is correct
36 Correct 5 ms 12008 KB Output is correct
37 Correct 5 ms 12088 KB Output is correct
38 Correct 5 ms 12080 KB Output is correct
39 Correct 6 ms 11988 KB Output is correct
40 Correct 6 ms 11988 KB Output is correct
41 Correct 5 ms 12076 KB Output is correct
42 Correct 7 ms 11988 KB Output is correct
43 Correct 5 ms 12116 KB Output is correct
44 Correct 7 ms 12080 KB Output is correct
45 Correct 5 ms 11988 KB Output is correct
46 Correct 7 ms 12116 KB Output is correct
47 Correct 6 ms 12076 KB Output is correct
48 Correct 5 ms 12052 KB Output is correct
49 Correct 6 ms 12116 KB Output is correct
50 Correct 5 ms 12080 KB Output is correct
51 Correct 6 ms 11988 KB Output is correct
52 Correct 8 ms 11988 KB Output is correct
53 Correct 6 ms 12116 KB Output is correct
54 Correct 5 ms 11988 KB Output is correct
55 Correct 5 ms 12088 KB Output is correct
56 Correct 6 ms 12076 KB Output is correct
57 Correct 7 ms 11988 KB Output is correct
58 Correct 9 ms 12092 KB Output is correct
59 Correct 288 ms 37704 KB Output is correct
60 Correct 316 ms 40688 KB Output is correct
61 Correct 6 ms 12060 KB Output is correct
62 Correct 5 ms 11988 KB Output is correct
63 Correct 194 ms 35128 KB Output is correct
64 Correct 9 ms 12504 KB Output is correct
65 Correct 14 ms 14012 KB Output is correct
66 Correct 124 ms 28588 KB Output is correct
67 Correct 373 ms 48860 KB Output is correct
68 Correct 384 ms 49708 KB Output is correct
69 Correct 10 ms 13012 KB Output is correct
70 Correct 54 ms 21800 KB Output is correct
71 Correct 196 ms 43832 KB Output is correct
72 Correct 213 ms 42700 KB Output is correct
73 Correct 48 ms 19604 KB Output is correct
74 Correct 308 ms 39684 KB Output is correct
75 Correct 22 ms 15436 KB Output is correct
76 Correct 233 ms 43492 KB Output is correct
77 Correct 241 ms 43564 KB Output is correct
78 Correct 22 ms 15700 KB Output is correct
79 Correct 426 ms 47092 KB Output is correct
80 Correct 8 ms 12244 KB Output is correct
81 Correct 59 ms 21992 KB Output is correct
82 Correct 310 ms 41492 KB Output is correct
83 Correct 288 ms 39568 KB Output is correct
84 Correct 338 ms 39608 KB Output is correct
85 Correct 339 ms 39652 KB Output is correct
86 Correct 290 ms 40716 KB Output is correct
87 Correct 368 ms 40692 KB Output is correct