답안 #394663

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
394663	2021-04-27T07:10:24 Z	saniyar_krmi	Network (BOI15_net)	C++14	100 / 100	645 ms	64284 KB

// Possible Overdose for this coder
#include <bits/stdc++.h>
#define put(x) cerr << #x << ": " << x << '\n'
#define line() cerr << "**************\n"

//#define F first
//#define S second
//#define mul(x, y) (((x) * (y)) %mod)
//#define bit(i, j) (((i)>>(j)) &1)
//#define left(id) ((id<<1) + 1)
//#define right(id) ((id<<1) + 2)
 
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<pii, int> piii;

const int maxn = 5e5 + 10;
int n;
vector <int> G[maxn];
int l[maxn], num;

void dfs(int v, int par){
	if(G[v].size() == 1)
		l[v] = 1;

	for(int u: G[v]){
		if(u == par)
			continue;
		dfs(u, v);
		l[v] += l[u];
	}
}

int find(int v, int par){
	for(int u: G[v]){
		if(u == par)
			continue;
		if(l[u] > num / 2)
			return find(u, v);
	}
	return v;
}

vector <int> s[maxn];
void make(int v, int par, int x){
	if(G[v].size() == 1)
		s[x].push_back(v);

	for(int u: G[v]){
		if(u == par)
			continue;
		make(u, v, x);
	}
}

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(0);  cout.tie(0);

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

	dfs(1, 0);
	num = l[1];

	v = find(1, 0);

	int cnt = 0;
	for(int u: G[v])
		make(u, v, cnt++);

	int res = (num + 1) >> 1;
	vector <int> ans(2 * res);
	
	int pt = 0;
	for(int i=0; i<cnt; i++)
		for(int vi: s[i]){
			ans[pt] = vi;
			pt += 2;
			if(pt == (2 * res))
				pt = 1;
		}
	
	if(ans.size() && ans.back() == 0)
		ans.back() = s[0][0], put(1);

	cout << res << '\n';
	for(int i=0; i<ans.size(); i+=2)
		cout << ans[i] << ' ' << ans[i + 1] << '\n';
}

Compilation message

net.cpp: In function 'int main()':
net.cpp:94:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   94 |  for(int i=0; i<ans.size(); i+=2)
      |               ~^~~~~~~~~~~

Subtask #1
18.0 / 18.0

#	결과	실행 시간	메모리	Grader output
1	Correct	15 ms	23756 KB	Output is correct
2	Correct	15 ms	23692 KB	Output is correct
3	Correct	17 ms	23756 KB	Output is correct
4	Correct	16 ms	23748 KB	Output is correct
5	Correct	15 ms	23804 KB	Output is correct
6	Correct	16 ms	23756 KB	Output is correct
7	Correct	15 ms	23792 KB	Output is correct
8	Correct	15 ms	23756 KB	Output is correct
9	Correct	15 ms	23756 KB	Output is correct
10	Correct	16 ms	23800 KB	Output is correct
11	Correct	15 ms	23756 KB	Output is correct
12	Correct	16 ms	23752 KB	Output is correct
13	Correct	15 ms	23756 KB	Output is correct
14	Correct	16 ms	23712 KB	Output is correct
15	Correct	16 ms	23756 KB	Output is correct
16	Correct	15 ms	23736 KB	Output is correct
17	Correct	16 ms	23716 KB	Output is correct
18	Correct	15 ms	23756 KB	Output is correct
19	Correct	15 ms	23808 KB	Output is correct
20	Correct	15 ms	23684 KB	Output is correct

Subtask #2
45.0 / 45.0

#	결과	실행 시간	메모리	Grader output
1	Correct	15 ms	23756 KB	Output is correct
2	Correct	15 ms	23692 KB	Output is correct
3	Correct	17 ms	23756 KB	Output is correct
4	Correct	16 ms	23748 KB	Output is correct
5	Correct	15 ms	23804 KB	Output is correct
6	Correct	16 ms	23756 KB	Output is correct
7	Correct	15 ms	23792 KB	Output is correct
8	Correct	15 ms	23756 KB	Output is correct
9	Correct	15 ms	23756 KB	Output is correct
10	Correct	16 ms	23800 KB	Output is correct
11	Correct	15 ms	23756 KB	Output is correct
12	Correct	16 ms	23752 KB	Output is correct
13	Correct	15 ms	23756 KB	Output is correct
14	Correct	16 ms	23712 KB	Output is correct
15	Correct	16 ms	23756 KB	Output is correct
16	Correct	15 ms	23736 KB	Output is correct
17	Correct	16 ms	23716 KB	Output is correct
18	Correct	15 ms	23756 KB	Output is correct
19	Correct	15 ms	23808 KB	Output is correct
20	Correct	15 ms	23684 KB	Output is correct
21	Correct	15 ms	23756 KB	Output is correct
22	Correct	17 ms	24056 KB	Output is correct
23	Correct	16 ms	23884 KB	Output is correct
24	Correct	16 ms	23972 KB	Output is correct
25	Correct	16 ms	23884 KB	Output is correct
26	Correct	16 ms	23808 KB	Output is correct
27	Correct	16 ms	23808 KB	Output is correct
28	Correct	16 ms	23884 KB	Output is correct
29	Correct	16 ms	23756 KB	Output is correct
30	Correct	15 ms	23696 KB	Output is correct
31	Correct	17 ms	23884 KB	Output is correct
32	Correct	15 ms	23704 KB	Output is correct
33	Correct	15 ms	23756 KB	Output is correct
34	Correct	15 ms	23808 KB	Output is correct
35	Correct	16 ms	23756 KB	Output is correct
36	Correct	15 ms	23756 KB	Output is correct
37	Correct	16 ms	23800 KB	Output is correct
38	Correct	19 ms	23888 KB	Output is correct
39	Correct	17 ms	23748 KB	Output is correct
40	Correct	15 ms	23704 KB	Output is correct
41	Correct	16 ms	23756 KB	Output is correct
42	Correct	16 ms	23848 KB	Output is correct
43	Correct	16 ms	23884 KB	Output is correct
44	Correct	15 ms	23784 KB	Output is correct
45	Correct	17 ms	23744 KB	Output is correct
46	Correct	16 ms	23760 KB	Output is correct
47	Correct	15 ms	23756 KB	Output is correct
48	Correct	17 ms	23756 KB	Output is correct
49	Correct	18 ms	23756 KB	Output is correct
50	Correct	16 ms	23812 KB	Output is correct
51	Correct	15 ms	23708 KB	Output is correct
52	Correct	15 ms	23716 KB	Output is correct
53	Correct	16 ms	23872 KB	Output is correct
54	Correct	18 ms	23788 KB	Output is correct
55	Correct	16 ms	23772 KB	Output is correct
56	Correct	16 ms	23816 KB	Output is correct
57	Correct	16 ms	23732 KB	Output is correct
58	Correct	16 ms	23884 KB	Output is correct

Subtask #3
37.0 / 37.0

#	결과	실행 시간	메모리	Grader output
1	Correct	15 ms	23756 KB	Output is correct
2	Correct	15 ms	23692 KB	Output is correct
3	Correct	17 ms	23756 KB	Output is correct
4	Correct	16 ms	23748 KB	Output is correct
5	Correct	15 ms	23804 KB	Output is correct
6	Correct	16 ms	23756 KB	Output is correct
7	Correct	15 ms	23792 KB	Output is correct
8	Correct	15 ms	23756 KB	Output is correct
9	Correct	15 ms	23756 KB	Output is correct
10	Correct	16 ms	23800 KB	Output is correct
11	Correct	15 ms	23756 KB	Output is correct
12	Correct	16 ms	23752 KB	Output is correct
13	Correct	15 ms	23756 KB	Output is correct
14	Correct	16 ms	23712 KB	Output is correct
15	Correct	16 ms	23756 KB	Output is correct
16	Correct	15 ms	23736 KB	Output is correct
17	Correct	16 ms	23716 KB	Output is correct
18	Correct	15 ms	23756 KB	Output is correct
19	Correct	15 ms	23808 KB	Output is correct
20	Correct	15 ms	23684 KB	Output is correct
21	Correct	15 ms	23756 KB	Output is correct
22	Correct	17 ms	24056 KB	Output is correct
23	Correct	16 ms	23884 KB	Output is correct
24	Correct	16 ms	23972 KB	Output is correct
25	Correct	16 ms	23884 KB	Output is correct
26	Correct	16 ms	23808 KB	Output is correct
27	Correct	16 ms	23808 KB	Output is correct
28	Correct	16 ms	23884 KB	Output is correct
29	Correct	16 ms	23756 KB	Output is correct
30	Correct	15 ms	23696 KB	Output is correct
31	Correct	17 ms	23884 KB	Output is correct
32	Correct	15 ms	23704 KB	Output is correct
33	Correct	15 ms	23756 KB	Output is correct
34	Correct	15 ms	23808 KB	Output is correct
35	Correct	16 ms	23756 KB	Output is correct
36	Correct	15 ms	23756 KB	Output is correct
37	Correct	16 ms	23800 KB	Output is correct
38	Correct	19 ms	23888 KB	Output is correct
39	Correct	17 ms	23748 KB	Output is correct
40	Correct	15 ms	23704 KB	Output is correct
41	Correct	16 ms	23756 KB	Output is correct
42	Correct	16 ms	23848 KB	Output is correct
43	Correct	16 ms	23884 KB	Output is correct
44	Correct	15 ms	23784 KB	Output is correct
45	Correct	17 ms	23744 KB	Output is correct
46	Correct	16 ms	23760 KB	Output is correct
47	Correct	15 ms	23756 KB	Output is correct
48	Correct	17 ms	23756 KB	Output is correct
49	Correct	18 ms	23756 KB	Output is correct
50	Correct	16 ms	23812 KB	Output is correct
51	Correct	15 ms	23708 KB	Output is correct
52	Correct	15 ms	23716 KB	Output is correct
53	Correct	16 ms	23872 KB	Output is correct
54	Correct	18 ms	23788 KB	Output is correct
55	Correct	16 ms	23772 KB	Output is correct
56	Correct	16 ms	23816 KB	Output is correct
57	Correct	16 ms	23732 KB	Output is correct
58	Correct	16 ms	23884 KB	Output is correct
59	Correct	472 ms	48148 KB	Output is correct
60	Correct	511 ms	47392 KB	Output is correct
61	Correct	16 ms	23756 KB	Output is correct
62	Correct	15 ms	23760 KB	Output is correct
63	Correct	395 ms	44808 KB	Output is correct
64	Correct	18 ms	24268 KB	Output is correct
65	Correct	28 ms	26076 KB	Output is correct
66	Correct	199 ms	43376 KB	Output is correct
67	Correct	621 ms	62416 KB	Output is correct
68	Correct	619 ms	63416 KB	Output is correct
69	Correct	23 ms	24928 KB	Output is correct
70	Correct	113 ms	35828 KB	Output is correct
71	Correct	409 ms	64284 KB	Output is correct
72	Correct	413 ms	61948 KB	Output is correct
73	Correct	108 ms	29936 KB	Output is correct
74	Correct	566 ms	45812 KB	Output is correct
75	Correct	42 ms	27336 KB	Output is correct
76	Correct	392 ms	56836 KB	Output is correct
77	Correct	373 ms	57452 KB	Output is correct
78	Correct	48 ms	27208 KB	Output is correct
79	Correct	645 ms	59456 KB	Output is correct
80	Correct	17 ms	24012 KB	Output is correct
81	Correct	136 ms	34216 KB	Output is correct
82	Correct	485 ms	55116 KB	Output is correct
83	Correct	542 ms	45812 KB	Output is correct
84	Correct	522 ms	46028 KB	Output is correct
85	Correct	549 ms	46156 KB	Output is correct
86	Correct	525 ms	47140 KB	Output is correct
87	Correct	535 ms	47360 KB	Output is correct

답안 #394663

Compilation message

Subtask #1 18.0 / 18.0

Subtask #2 45.0 / 45.0

Subtask #3 37.0 / 37.0

Subtask #1
18.0 / 18.0

Subtask #2
45.0 / 45.0

Subtask #3
37.0 / 37.0