oj.uz

답안 #609974

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
609974 2022-07-28T03:50:55 Z aSSSd Network (BOI15_net) C++14
100 / 100
 899 ms 138172 KB 
#include <bits/stdc++.h>
using namespace std;
#define in ({int x=0;int c=getchar(),n=0;for(;!isdigit(c);c=getchar()) n=(c=='-');for(;isdigit(c);c=getchar()) x=x*10+c-'0';n?-x:x;})
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int rnd(int l,int r)
{
    return l+rng()%(r-l+1);
}
#define fasty ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0);
#define forinc(x,a,b) for(int x=a;x<=b;x++)
#define fordec(x,a,b) for(int x=a;x>=b;x--)
#define forv(a,b) for(auto&a:b)
#define fi first
#define se second
#define pb push_back
#define ii pair<int,int>
#define mt make_tuple
#define all(a) a.begin(),a.end()
#define reset(f,x) memset(f,x,sizeof(f))
#define getbit(x,i) ((x>>i)&1)
#define batbit(x,i) (x|(1ll<<i))
#define tatbit(x,i) (x&~(1<<i))
#define gg exit(0);
const int N = 5e5 + 100;
vector<int> ke[N];
set<int> adj[N];
int n, m;
int num[N], low[N], it, del[N];
stack<int> st;
int cnt;
int id[N], two[N];
void dfs(int u,int p)
{
	num[u]=low[u]=++it;
	st.push(u);
	for(auto v:ke[u])
	{
	    if(del[v]) continue;
		if(v==p) continue;
		if(!num[v])
		{
			dfs(v,u);
			low[u]=min(low[u],low[v]);
		}
		else  low[u]=min(low[u],num[v]);
	}
	if(num[u]==low[u])
	{
		cnt++;
		int v;
		while(1)
		{
			v=st.top();
			st.pop();
			id[v]=cnt;
			del[v]=1;
			two[cnt] = v;
			if(v==u) break;
		}
	}
}
vector<int> leaf;
void dfs2(int u, int pa)
{
    if(adj[u].size() == 1) leaf.pb(two[u]);

    for(auto v : adj[u])
    {
        if(v == pa) continue;
        dfs2(v,u);
    }
}

main()
{
    fasty;
   // freopen("bluehouse.inp" , "r" ,stdin);
   // freopen("bluehouse.out" , "w", stdout );
  //  freopen("task.inp" , "r", stdin);
    cin >> n;
    m=n-1;
    forinc(i,1,m)
    {
        int u,v;
        cin >> u >> v;
        ke[u].pb(v);
        ke[v].pb(u);
    }
    forinc(i,1,n) if(!num[i]) dfs(i,0);

    forinc(i,1,n)
    {
        for(auto v : ke[i])
        {
            int x = id[i];
            int y = id[v];
            if(x!=y)
            {
                adj[x].insert(y);
                adj[y].insert(x);
            }
        }
    }

    dfs2(1,0);
    int l=0;
    int step = leaf.size()/2;
    if(leaf.size() % 2 == 0)
    {
        cout << leaf.size()/2 << "\n";
        while(l + leaf.size()/2 < leaf.size())
        {
            cout << leaf[l] << " " << leaf[l + step] << "\n";
            l++;
        }
        return 0;
    }
    leaf.pb(leaf[0]);
    step++;
    cout << leaf.size()/2 << "\n";
    while(l + step < leaf.size())
    {
        cout << leaf[l] << " " << leaf[l + step] << "\n";
        l++;
    }
}

Compilation message

net.cpp:75:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   75 | main()
      | ^~~~
net.cpp: In function 'int main()':
net.cpp:122:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  122 |     while(l + step < leaf.size())
      |           ~~~~~~~~~^~~~~~~~~~~~~

Subtask #1
18.0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 22 ms 35540 KB Output is correct
2 Correct 18 ms 35596 KB Output is correct
3 Correct 22 ms 35592 KB Output is correct
4 Correct 19 ms 35536 KB Output is correct
5 Correct 22 ms 35564 KB Output is correct
6 Correct 20 ms 35540 KB Output is correct
7 Correct 17 ms 35540 KB Output is correct
8 Correct 19 ms 35508 KB Output is correct
9 Correct 18 ms 35496 KB Output is correct
10 Correct 20 ms 35476 KB Output is correct
11 Correct 21 ms 35540 KB Output is correct
12 Correct 19 ms 35516 KB Output is correct
13 Correct 18 ms 35472 KB Output is correct
14 Correct 20 ms 35492 KB Output is correct
15 Correct 22 ms 35532 KB Output is correct
16 Correct 18 ms 35556 KB Output is correct
17 Correct 19 ms 35516 KB Output is correct
18 Correct 21 ms 35540 KB Output is correct
19 Correct 18 ms 35576 KB Output is correct
20 Correct 19 ms 35536 KB Output is correct

Subtask #2
45.0 / 45.0

# 결과 실행 시간 메모리 Grader output
1 Correct 22 ms 35540 KB Output is correct
2 Correct 18 ms 35596 KB Output is correct
3 Correct 22 ms 35592 KB Output is correct
4 Correct 19 ms 35536 KB Output is correct
5 Correct 22 ms 35564 KB Output is correct
6 Correct 20 ms 35540 KB Output is correct
7 Correct 17 ms 35540 KB Output is correct
8 Correct 19 ms 35508 KB Output is correct
9 Correct 18 ms 35496 KB Output is correct
10 Correct 20 ms 35476 KB Output is correct
11 Correct 21 ms 35540 KB Output is correct
12 Correct 19 ms 35516 KB Output is correct
13 Correct 18 ms 35472 KB Output is correct
14 Correct 20 ms 35492 KB Output is correct
15 Correct 22 ms 35532 KB Output is correct
16 Correct 18 ms 35556 KB Output is correct
17 Correct 19 ms 35516 KB Output is correct
18 Correct 21 ms 35540 KB Output is correct
19 Correct 18 ms 35576 KB Output is correct
20 Correct 19 ms 35536 KB Output is correct
21 Correct 23 ms 35528 KB Output is correct
22 Correct 19 ms 35796 KB Output is correct
23 Correct 18 ms 35904 KB Output is correct
24 Correct 19 ms 35880 KB Output is correct
25 Correct 24 ms 35880 KB Output is correct
26 Correct 29 ms 35836 KB Output is correct
27 Correct 21 ms 35836 KB Output is correct
28 Correct 19 ms 35796 KB Output is correct
29 Correct 21 ms 35784 KB Output is correct
30 Correct 24 ms 35540 KB Output is correct
31 Correct 23 ms 35884 KB Output is correct
32 Correct 17 ms 35540 KB Output is correct
33 Correct 20 ms 35540 KB Output is correct
34 Correct 25 ms 35540 KB Output is correct
35 Correct 19 ms 35596 KB Output is correct
36 Correct 22 ms 35540 KB Output is correct
37 Correct 16 ms 35668 KB Output is correct
38 Correct 17 ms 35668 KB Output is correct
39 Correct 16 ms 35584 KB Output is correct
40 Correct 16 ms 35576 KB Output is correct
41 Correct 18 ms 35524 KB Output is correct
42 Correct 18 ms 35668 KB Output is correct
43 Correct 20 ms 35668 KB Output is correct
44 Correct 21 ms 35516 KB Output is correct
45 Correct 20 ms 35628 KB Output is correct
46 Correct 24 ms 35668 KB Output is correct
47 Correct 19 ms 35540 KB Output is correct
48 Correct 20 ms 35592 KB Output is correct
49 Correct 17 ms 35732 KB Output is correct
50 Correct 21 ms 35560 KB Output is correct
51 Correct 17 ms 35592 KB Output is correct
52 Correct 17 ms 35668 KB Output is correct
53 Correct 17 ms 35668 KB Output is correct
54 Correct 20 ms 35532 KB Output is correct
55 Correct 17 ms 35592 KB Output is correct
56 Correct 21 ms 35540 KB Output is correct
57 Correct 17 ms 35576 KB Output is correct
58 Correct 24 ms 35836 KB Output is correct

Subtask #3
37.0 / 37.0

# 결과 실행 시간 메모리 Grader output
1 Correct 22 ms 35540 KB Output is correct
2 Correct 18 ms 35596 KB Output is correct
3 Correct 22 ms 35592 KB Output is correct
4 Correct 19 ms 35536 KB Output is correct
5 Correct 22 ms 35564 KB Output is correct
6 Correct 20 ms 35540 KB Output is correct
7 Correct 17 ms 35540 KB Output is correct
8 Correct 19 ms 35508 KB Output is correct
9 Correct 18 ms 35496 KB Output is correct
10 Correct 20 ms 35476 KB Output is correct
11 Correct 21 ms 35540 KB Output is correct
12 Correct 19 ms 35516 KB Output is correct
13 Correct 18 ms 35472 KB Output is correct
14 Correct 20 ms 35492 KB Output is correct
15 Correct 22 ms 35532 KB Output is correct
16 Correct 18 ms 35556 KB Output is correct
17 Correct 19 ms 35516 KB Output is correct
18 Correct 21 ms 35540 KB Output is correct
19 Correct 18 ms 35576 KB Output is correct
20 Correct 19 ms 35536 KB Output is correct
21 Correct 23 ms 35528 KB Output is correct
22 Correct 19 ms 35796 KB Output is correct
23 Correct 18 ms 35904 KB Output is correct
24 Correct 19 ms 35880 KB Output is correct
25 Correct 24 ms 35880 KB Output is correct
26 Correct 29 ms 35836 KB Output is correct
27 Correct 21 ms 35836 KB Output is correct
28 Correct 19 ms 35796 KB Output is correct
29 Correct 21 ms 35784 KB Output is correct
30 Correct 24 ms 35540 KB Output is correct
31 Correct 23 ms 35884 KB Output is correct
32 Correct 17 ms 35540 KB Output is correct
33 Correct 20 ms 35540 KB Output is correct
34 Correct 25 ms 35540 KB Output is correct
35 Correct 19 ms 35596 KB Output is correct
36 Correct 22 ms 35540 KB Output is correct
37 Correct 16 ms 35668 KB Output is correct
38 Correct 17 ms 35668 KB Output is correct
39 Correct 16 ms 35584 KB Output is correct
40 Correct 16 ms 35576 KB Output is correct
41 Correct 18 ms 35524 KB Output is correct
42 Correct 18 ms 35668 KB Output is correct
43 Correct 20 ms 35668 KB Output is correct
44 Correct 21 ms 35516 KB Output is correct
45 Correct 20 ms 35628 KB Output is correct
46 Correct 24 ms 35668 KB Output is correct
47 Correct 19 ms 35540 KB Output is correct
48 Correct 20 ms 35592 KB Output is correct
49 Correct 17 ms 35732 KB Output is correct
50 Correct 21 ms 35560 KB Output is correct
51 Correct 17 ms 35592 KB Output is correct
52 Correct 17 ms 35668 KB Output is correct
53 Correct 17 ms 35668 KB Output is correct
54 Correct 20 ms 35532 KB Output is correct
55 Correct 17 ms 35592 KB Output is correct
56 Correct 21 ms 35540 KB Output is correct
57 Correct 17 ms 35576 KB Output is correct
58 Correct 24 ms 35836 KB Output is correct
59 Correct 780 ms 110480 KB Output is correct
60 Correct 899 ms 118964 KB Output is correct
61 Correct 21 ms 35540 KB Output is correct
62 Correct 20 ms 35596 KB Output is correct
63 Correct 689 ms 102460 KB Output is correct
64 Correct 23 ms 36736 KB Output is correct
65 Correct 32 ms 40796 KB Output is correct
66 Correct 284 ms 77200 KB Output is correct
67 Correct 795 ms 138172 KB Output is correct
68 Correct 791 ms 136704 KB Output is correct
69 Correct 29 ms 38220 KB Output is correct
70 Correct 224 ms 62936 KB Output is correct
71 Correct 853 ms 122308 KB Output is correct
72 Correct 793 ms 120888 KB Output is correct
73 Correct 163 ms 58348 KB Output is correct
74 Correct 746 ms 117892 KB Output is correct
75 Correct 69 ms 45032 KB Output is correct
76 Correct 869 ms 121844 KB Output is correct
77 Correct 842 ms 122036 KB Output is correct
78 Correct 58 ms 45612 KB Output is correct
79 Correct 759 ms 132628 KB Output is correct
80 Correct 21 ms 36300 KB Output is correct
81 Correct 222 ms 64096 KB Output is correct
82 Correct 766 ms 119736 KB Output is correct
83 Correct 757 ms 117884 KB Output is correct
84 Correct 728 ms 118008 KB Output is correct
85 Correct 728 ms 117948 KB Output is correct
86 Correct 775 ms 119084 KB Output is correct
87 Correct 766 ms 119088 KB Output is correct