oj.uz

답안 #543282

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
543282 2022-03-30T03:32:25 Z cheissmart Meetings 2 (JOI21_meetings2) C++14
100 / 100
 395 ms 42296 KB 
#include <bits/stdc++.h>
#define IO_OP ios::sync_with_stdio(0), cin.tie(0)
#define F first
#define S second
#define V vector
#define PB push_back
#define EB emplace_back
#define MP make_pair
#define SZ(v) int((v).size())
#define ALL(v) (v).begin(), (v).end()

using namespace std;

typedef long long ll;
typedef pair<int, int> pi;
typedef V<int> vi;

const int INF = 1e9 + 7, N = 2e5 + 7;

vi G[N];
int sz[N], n;

void get_c(int u, int& c, int p = 0) {
	int mx = 0;
	sz[u] = 1;
	for(int v:G[u]) if(v != p) {
		get_c(v, c, u);
		sz[u] += sz[v];
		mx = max(mx, sz[v]);
	}
	mx = max(mx, n - sz[u]);
	if(mx * 2 <= n) c = u;
}

V<pi> aux;

int p[N][20], d[N];

void dfs(int u, int pa = 0) {
	sz[u] = 1;
	p[u][0] = pa;
	for(int i = 1; i < 20; i++)
		p[u][i] = p[p[u][i - 1]][i - 1];
	for(int v:G[u]) if(v != pa) {
		d[v] = d[u] + 1;
		dfs(v, u);
		sz[u] += sz[v];
	}
	aux.EB(sz[u], u);
}

int lca(int u, int v) {
	if(d[u] > d[v]) swap(u, v);
	for(int i = 19; i >= 0; i--)
		if((d[v] - d[u]) >> i & 1)
			v = p[v][i];
	if(u == v) return u;
	for(int i = 19; i >= 0; i--)
		if(p[u][i] != p[v][i])
			u = p[u][i], v = p[v][i];
	return p[u][0];
}
int dist(int u, int v) {
	return d[u] + d[v] - d[lca(u, v)] * 2;
}

int ans[N];

signed main()
{
	IO_OP;
	
	cin >> n;
	for(int i = 0; i < n - 1; i++) {
		int u, v;
		cin >> u >> v;
		G[u].PB(v);
		G[v].PB(u);
	}
	int c; get_c(1, c);	
	
	dfs(c);
	sort(ALL(aux));
	int a = -1, b = -1;
	for(int i = n / 2 * 2; i >= 2; i -= 2) {
		while(SZ(aux) && aux.back().F >= i / 2) {
			int u = aux.back().S;
			aux.pop_back();
			if(a == -1) a = u;
			else if(b == -1) b = u;
			else {
				if(dist(a, u) > dist(a, b) || dist(b, u) > dist(a, b)) {
					if(dist(a, u) > dist(b, u)) b = u;
					else a = u;
				}
			}
		}
		if(a != -1 && b != -1) ans[i] = dist(a, b);
	}
	for(int i = 1; i <= n; i++)
		cout << ans[i] + 1 << '\n';
}

Subtask #1
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 4948 KB Output is correct
2 Correct 2 ms 4948 KB Output is correct
3 Correct 2 ms 4948 KB Output is correct
4 Correct 3 ms 4948 KB Output is correct
5 Correct 2 ms 4948 KB Output is correct
6 Correct 3 ms 4948 KB Output is correct
7 Correct 2 ms 4948 KB Output is correct
8 Correct 2 ms 4948 KB Output is correct
9 Correct 2 ms 4948 KB Output is correct
10 Correct 2 ms 4948 KB Output is correct
11 Correct 2 ms 4948 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct
13 Correct 2 ms 4948 KB Output is correct
14 Correct 3 ms 4948 KB Output is correct
15 Correct 3 ms 4948 KB Output is correct
16 Correct 3 ms 4948 KB Output is correct
17 Correct 3 ms 4948 KB Output is correct
18 Correct 3 ms 4948 KB Output is correct
19 Correct 3 ms 4948 KB Output is correct
20 Correct 2 ms 4948 KB Output is correct
21 Correct 4 ms 4948 KB Output is correct

Subtask #2
16.0 / 16.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 4948 KB Output is correct
2 Correct 2 ms 4948 KB Output is correct
3 Correct 2 ms 4948 KB Output is correct
4 Correct 3 ms 4948 KB Output is correct
5 Correct 2 ms 4948 KB Output is correct
6 Correct 3 ms 4948 KB Output is correct
7 Correct 2 ms 4948 KB Output is correct
8 Correct 2 ms 4948 KB Output is correct
9 Correct 2 ms 4948 KB Output is correct
10 Correct 2 ms 4948 KB Output is correct
11 Correct 2 ms 4948 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct
13 Correct 2 ms 4948 KB Output is correct
14 Correct 3 ms 4948 KB Output is correct
15 Correct 3 ms 4948 KB Output is correct
16 Correct 3 ms 4948 KB Output is correct
17 Correct 3 ms 4948 KB Output is correct
18 Correct 3 ms 4948 KB Output is correct
19 Correct 3 ms 4948 KB Output is correct
20 Correct 2 ms 4948 KB Output is correct
21 Correct 4 ms 4948 KB Output is correct
22 Correct 6 ms 5484 KB Output is correct
23 Correct 7 ms 5588 KB Output is correct
24 Correct 6 ms 5588 KB Output is correct
25 Correct 6 ms 5548 KB Output is correct
26 Correct 6 ms 5552 KB Output is correct
27 Correct 6 ms 5588 KB Output is correct
28 Correct 6 ms 5548 KB Output is correct
29 Correct 6 ms 5588 KB Output is correct
30 Correct 6 ms 5588 KB Output is correct
31 Correct 6 ms 5588 KB Output is correct
32 Correct 8 ms 5808 KB Output is correct
33 Correct 6 ms 5844 KB Output is correct
34 Correct 6 ms 5544 KB Output is correct
35 Correct 6 ms 5556 KB Output is correct
36 Correct 6 ms 5552 KB Output is correct
37 Correct 6 ms 5540 KB Output is correct
38 Correct 6 ms 5676 KB Output is correct

Subtask #3
80.0 / 80.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 4948 KB Output is correct
2 Correct 2 ms 4948 KB Output is correct
3 Correct 2 ms 4948 KB Output is correct
4 Correct 3 ms 4948 KB Output is correct
5 Correct 2 ms 4948 KB Output is correct
6 Correct 3 ms 4948 KB Output is correct
7 Correct 2 ms 4948 KB Output is correct
8 Correct 2 ms 4948 KB Output is correct
9 Correct 2 ms 4948 KB Output is correct
10 Correct 2 ms 4948 KB Output is correct
11 Correct 2 ms 4948 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct
13 Correct 2 ms 4948 KB Output is correct
14 Correct 3 ms 4948 KB Output is correct
15 Correct 3 ms 4948 KB Output is correct
16 Correct 3 ms 4948 KB Output is correct
17 Correct 3 ms 4948 KB Output is correct
18 Correct 3 ms 4948 KB Output is correct
19 Correct 3 ms 4948 KB Output is correct
20 Correct 2 ms 4948 KB Output is correct
21 Correct 4 ms 4948 KB Output is correct
22 Correct 6 ms 5484 KB Output is correct
23 Correct 7 ms 5588 KB Output is correct
24 Correct 6 ms 5588 KB Output is correct
25 Correct 6 ms 5548 KB Output is correct
26 Correct 6 ms 5552 KB Output is correct
27 Correct 6 ms 5588 KB Output is correct
28 Correct 6 ms 5548 KB Output is correct
29 Correct 6 ms 5588 KB Output is correct
30 Correct 6 ms 5588 KB Output is correct
31 Correct 6 ms 5588 KB Output is correct
32 Correct 8 ms 5808 KB Output is correct
33 Correct 6 ms 5844 KB Output is correct
34 Correct 6 ms 5544 KB Output is correct
35 Correct 6 ms 5556 KB Output is correct
36 Correct 6 ms 5552 KB Output is correct
37 Correct 6 ms 5540 KB Output is correct
38 Correct 6 ms 5676 KB Output is correct
39 Correct 260 ms 31120 KB Output is correct
40 Correct 257 ms 30584 KB Output is correct
41 Correct 261 ms 31108 KB Output is correct
42 Correct 253 ms 31540 KB Output is correct
43 Correct 271 ms 31520 KB Output is correct
44 Correct 264 ms 31640 KB Output is correct
45 Correct 395 ms 37372 KB Output is correct
46 Correct 292 ms 42296 KB Output is correct
47 Correct 210 ms 31264 KB Output is correct
48 Correct 171 ms 31488 KB Output is correct
49 Correct 263 ms 32264 KB Output is correct
50 Correct 185 ms 32180 KB Output is correct
51 Correct 236 ms 41112 KB Output is correct