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답안 #684961

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
684961 2023-01-23T00:18:37 Z arnold518 Meetings 2 (JOI21_meetings2) C++17
100 / 100
 690 ms 75640 KB 
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int MAXN = 2e5;
const int INF = 1e9+7;

int N;
vector<int> adj[MAXN+10], VV[MAXN+10];

int sz[MAXN+10], dep[MAXN+10], par[MAXN+10];
int ans[MAXN+10];

vector<int> dfn;

void dfs(int now, int bef, int d)
{
	sz[now]=1;
	dep[now]=d;
	par[now]=bef;
	VV[now].push_back(dfn.size());
	dfn.push_back(now);
	for(int nxt : adj[now])
	{
		if(nxt==bef) continue;
		dfs(nxt, now, d+1);
		VV[now].push_back(dfn.size());
		dfn.push_back(now);
		sz[now]+=sz[nxt];
	}
}

struct UF
{
	int par[MAXN+10], minv[MAXN+10], maxv[MAXN+10];
	void init()
	{
		for(int i=1; i<=N; i++)
		{
			par[i]=i;
			maxv[i]=minv[i]=dep[i];
		}
	}
	int Find(int x)
	{
		if(x==par[x]) return x;
		return par[x]=Find(par[x]);
	}
	void Union(int x, int y)
	{
		x=Find(x); y=Find(y);
		minv[x]=min(minv[x], minv[y]);
		maxv[x]=max(maxv[x], maxv[y]);
		par[y]=x;
	}
}uf;

struct Node
{
	int a, ab, aba, b, ba;
	Node() : a(-INF), ab(-INF), aba(-INF), b(-INF), ba(-INF) {}
};

Node operator + (const Node &p, const Node &q)
{
	Node ret;
	ret.a=max(p.a, q.a);
	ret.b=max(p.b, q.b);
	ret.ab=max({p.ab, q.ab, p.a+q.b});
	ret.ba=max({p.ba, q.ba, p.b+q.a});
	ret.aba=max({p.aba, q.aba, p.a+q.ba, p.ab+q.a});
	return ret;
}

struct SEG
{
	Node tree[MAXN*8+10];
	void update(int node, int tl, int tr, int p, int q)
	{
		if(tl==tr)
		{
			if(q==1) tree[node].a=dep[dfn[tl]];
			else if(q==2) tree[node].a=-INF;
			else tree[node].b=-2*dep[dfn[tl]];
			return;
		}
		int mid=tl+tr>>1;
		if(p<=mid) update(node*2, tl, mid, p, q);
		else update(node*2+1, mid+1, tr, p, q);
		tree[node]=tree[node*2]+tree[node*2+1];
	}
	int val() { return tree[1].aba; }
}seg;

int main()
{
	scanf("%d", &N);
	for(int i=1; i<N; i++)
	{
		int u, v;
		scanf("%d%d", &u, &v);
		adj[u].push_back(v);
		adj[v].push_back(u);
	}

	dfs(1, 1, 1);

	vector<pii> V;
	int t=0;
	for(int i=2; i<=N; i++)
	{
		int p=sz[i], q=sz[par[i]];
		V.push_back({min({p, N-p, q, N-q}), i});
		t=max(t, min(p, N-p));
	}

	sort(V.begin(), V.end(), greater<pii>());

	uf.init();

	int val=1;
	for(int i=N/2, j=0; i>=1; i--)
	{
		if(t>=i) val=max(val, 2);
		for(; j<V.size() && V[j].first>=i; j++)
		{
			int u=V[j].second;
			uf.Union(u, par[u]);
			u=uf.Find(u);
			val=max(val, uf.maxv[u]-uf.minv[u]+2);
		}
		ans[i]=val;
	}

	V.clear();
	for(int i=1; i<=N; i++) V.push_back({sz[i], i});
	sort(V.begin(), V.end(), greater<pii>());

	for(int i=N/2, j=0; i>=1; i--)
	{
		for(; j<V.size() && V[j].first>=i; j++)
		{
			if(V[j].second!=1) seg.update(1, 0, dfn.size()-1, VV[par[V[j].second]].front(), 2);
			for(auto it : VV[V[j].second]) seg.update(1, 0, dfn.size()-1, it, 0);
			seg.update(1, 0, dfn.size()-1, VV[V[j].second].front(), 1);
		}
		ans[i]=max(ans[i], seg.val()+1);
		//printf("!%d\n", seg.val());
	}

	for(int i=1; i<=N; i++)
	{
		if(i%2) printf("1\n");
		else printf("%d\n", ans[i/2]);
	}
}

Compilation message

meetings2.cpp: In member function 'void SEG::update(int, int, int, int, int)':
meetings2.cpp:90:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   90 |   int mid=tl+tr>>1;
      |           ~~^~~
meetings2.cpp: In function 'int main()':
meetings2.cpp:128:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  128 |   for(; j<V.size() && V[j].first>=i; j++)
      |         ~^~~~~~~~~
meetings2.cpp:144:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  144 |   for(; j<V.size() && V[j].first>=i; j++)
      |         ~^~~~~~~~~
meetings2.cpp:100:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  100 |  scanf("%d", &N);
      |  ~~~~~^~~~~~~~~~
meetings2.cpp:104:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  104 |   scanf("%d%d", &u, &v);
      |   ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 19 ms 40916 KB Output is correct
2 Correct 20 ms 40932 KB Output is correct
3 Correct 19 ms 40968 KB Output is correct
4 Correct 22 ms 40996 KB Output is correct
5 Correct 19 ms 40996 KB Output is correct
6 Correct 21 ms 41012 KB Output is correct
7 Correct 17 ms 40996 KB Output is correct
8 Correct 21 ms 41044 KB Output is correct
9 Correct 17 ms 41044 KB Output is correct
10 Correct 18 ms 41032 KB Output is correct
11 Correct 20 ms 41024 KB Output is correct
12 Correct 18 ms 40984 KB Output is correct
13 Correct 19 ms 41044 KB Output is correct
14 Correct 18 ms 40968 KB Output is correct
15 Correct 19 ms 41044 KB Output is correct
16 Correct 22 ms 41044 KB Output is correct
17 Correct 19 ms 41040 KB Output is correct
18 Correct 20 ms 40944 KB Output is correct
19 Correct 18 ms 41044 KB Output is correct
20 Correct 19 ms 41032 KB Output is correct
21 Correct 18 ms 41044 KB Output is correct

Subtask #2
16.0 / 16.0

# 결과 실행 시간 메모리 Grader output
1 Correct 19 ms 40916 KB Output is correct
2 Correct 20 ms 40932 KB Output is correct
3 Correct 19 ms 40968 KB Output is correct
4 Correct 22 ms 40996 KB Output is correct
5 Correct 19 ms 40996 KB Output is correct
6 Correct 21 ms 41012 KB Output is correct
7 Correct 17 ms 40996 KB Output is correct
8 Correct 21 ms 41044 KB Output is correct
9 Correct 17 ms 41044 KB Output is correct
10 Correct 18 ms 41032 KB Output is correct
11 Correct 20 ms 41024 KB Output is correct
12 Correct 18 ms 40984 KB Output is correct
13 Correct 19 ms 41044 KB Output is correct
14 Correct 18 ms 40968 KB Output is correct
15 Correct 19 ms 41044 KB Output is correct
16 Correct 22 ms 41044 KB Output is correct
17 Correct 19 ms 41040 KB Output is correct
18 Correct 20 ms 40944 KB Output is correct
19 Correct 18 ms 41044 KB Output is correct
20 Correct 19 ms 41032 KB Output is correct
21 Correct 18 ms 41044 KB Output is correct
22 Correct 26 ms 41420 KB Output is correct
23 Correct 25 ms 41428 KB Output is correct
24 Correct 25 ms 41528 KB Output is correct
25 Correct 29 ms 41420 KB Output is correct
26 Correct 30 ms 41556 KB Output is correct
27 Correct 26 ms 41472 KB Output is correct
28 Correct 25 ms 41420 KB Output is correct
29 Correct 26 ms 41428 KB Output is correct
30 Correct 25 ms 41584 KB Output is correct
31 Correct 27 ms 41456 KB Output is correct
32 Correct 25 ms 41556 KB Output is correct
33 Correct 24 ms 41712 KB Output is correct
34 Correct 25 ms 41476 KB Output is correct
35 Correct 24 ms 41468 KB Output is correct
36 Correct 27 ms 41472 KB Output is correct
37 Correct 25 ms 41484 KB Output is correct
38 Correct 24 ms 41632 KB Output is correct

Subtask #3
80.0 / 80.0

# 결과 실행 시간 메모리 Grader output
1 Correct 19 ms 40916 KB Output is correct
2 Correct 20 ms 40932 KB Output is correct
3 Correct 19 ms 40968 KB Output is correct
4 Correct 22 ms 40996 KB Output is correct
5 Correct 19 ms 40996 KB Output is correct
6 Correct 21 ms 41012 KB Output is correct
7 Correct 17 ms 40996 KB Output is correct
8 Correct 21 ms 41044 KB Output is correct
9 Correct 17 ms 41044 KB Output is correct
10 Correct 18 ms 41032 KB Output is correct
11 Correct 20 ms 41024 KB Output is correct
12 Correct 18 ms 40984 KB Output is correct
13 Correct 19 ms 41044 KB Output is correct
14 Correct 18 ms 40968 KB Output is correct
15 Correct 19 ms 41044 KB Output is correct
16 Correct 22 ms 41044 KB Output is correct
17 Correct 19 ms 41040 KB Output is correct
18 Correct 20 ms 40944 KB Output is correct
19 Correct 18 ms 41044 KB Output is correct
20 Correct 19 ms 41032 KB Output is correct
21 Correct 18 ms 41044 KB Output is correct
22 Correct 26 ms 41420 KB Output is correct
23 Correct 25 ms 41428 KB Output is correct
24 Correct 25 ms 41528 KB Output is correct
25 Correct 29 ms 41420 KB Output is correct
26 Correct 30 ms 41556 KB Output is correct
27 Correct 26 ms 41472 KB Output is correct
28 Correct 25 ms 41420 KB Output is correct
29 Correct 26 ms 41428 KB Output is correct
30 Correct 25 ms 41584 KB Output is correct
31 Correct 27 ms 41456 KB Output is correct
32 Correct 25 ms 41556 KB Output is correct
33 Correct 24 ms 41712 KB Output is correct
34 Correct 25 ms 41476 KB Output is correct
35 Correct 24 ms 41468 KB Output is correct
36 Correct 27 ms 41472 KB Output is correct
37 Correct 25 ms 41484 KB Output is correct
38 Correct 24 ms 41632 KB Output is correct
39 Correct 690 ms 64788 KB Output is correct
40 Correct 644 ms 64312 KB Output is correct
41 Correct 655 ms 64848 KB Output is correct
42 Correct 675 ms 65328 KB Output is correct
43 Correct 669 ms 65208 KB Output is correct
44 Correct 682 ms 65208 KB Output is correct
45 Correct 582 ms 70892 KB Output is correct
46 Correct 488 ms 75640 KB Output is correct
47 Correct 552 ms 65892 KB Output is correct
48 Correct 467 ms 66276 KB Output is correct
49 Correct 568 ms 66196 KB Output is correct
50 Correct 509 ms 66392 KB Output is correct
51 Correct 478 ms 74760 KB Output is correct