oj.uz

답안 #107847

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
107847 2019-04-26T03:42:48 Z qkxwsm Hard route (IZhO17_road) C++14
52 / 100
 1870 ms 92652 KB 
//clever
#pragma GCC optimize ("O3")
#pragma GCC target ("sse4")
#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/rope>

using namespace std;
using namespace __gnu_pbds;
using namespace __gnu_cxx;

random_device(rd);
mt19937 rng(rd());
const long long FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();

struct custom_hash
{
	template<class T>
	unsigned long long operator()(T v) const
	{
		unsigned long long x = v;
		x += FIXED_RANDOM;
		// x += 11400714819323198485ull;
		// x = (x ^ (x >> 30)) * 13787848793156543929ull;
		x = (x ^ (x >> 27)) * 10723151780598845931ull;
		return x ^ (x >> 31);
	}
};

template<class T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template<class T, class U> using hash_table = gp_hash_table<T, U, custom_hash>;

template<class T>
T randomize(T mod)
{
	return (uniform_int_distribution<T>(0, mod - 1))(rng);
}
template<class T>
void readi(T &x)
{
	x = 0;
	bool negative = false;
	char c = ' ';
	while (c < '-')
	{
		c = getchar();
	}
	if (c == '-')
	{
		negative = true;
		c = getchar();
	}
	while (c >= '0')
	{
		x = x * 10 + (c - '0');
		c = getchar();
	}
	if (negative)
	{
		x = -x;
	}
}
template<class T>
void printi(T output)
{
	if (output == 0)
	{
		putchar('0');
		return;
	}
	if (output < 0)
	{
		putchar('-');
		output = -output;
	}
	int buf[20], n = 0;
	while(output)
	{
		buf[n] = ((output % 10));
		output /= 10;
		n++;
	}
	for (n--; n >= 0; n--)
	{
		putchar(buf[n] + '0');
	}
	return;
}
template<class T>
void ckmin(T &a, T b)
{
	a = min(a, b);
}
template<class T>
void ckmax(T &a, T b)
{
	a = max(a, b);
}
long long expo(long long a, long long e, long long mod)
{
	return ((e == 0) ? 1 : ((expo(a * a % mod, e >> 1, mod)) * ((e & 1) ? a : 1) % mod));
}
template<class T, class U>
void nmod(T &x, U mod)
{
	if (x >= mod) x -= mod;
}
template<class T>
T gcd(T a, T b)
{
	return (b ? gcd(b, a % b) : a);
}

#define y0 ___y0
#define y1 ___y1
#define MP make_pair
#define PB push_back
#define LB lower_bound
#define UB upper_bound
#define fi first
#define se second
#define DBG(x) cerr << #x << " = " << (x) << endl
#define SZ(x) ((int) ((x).size()))
#define FOR(i, a, b) for (auto i = (a); i < (b); i++)
#define FORD(i, a, b) for (auto i = (a) - 1; i >= (b); i--)
#define ALL(x) (x).begin(), (x).end()

const long double PI = 4.0 * atan(1.0);
const long double EPS = 1e-9;

#define MAGIC 347
#define SINF 10007
#define CO 1000007
#define INF 1000000007
#define BIG 1000000931
#define LARGE 1696969696967ll
#define GIANT 2564008813937411ll
#define LLINF 2696969696969696969ll
#define MAXN 500013

typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<ld, ld> pdd;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<ld> vd;
typedef vector<pii> vpi;
typedef vector<pll> vpl;
typedef vector<pdd> vpd;

int N;
vi edge[MAXN];
pll ans = {0, 0};
int depth[MAXN];
pll dp[MAXN];
int dist[2][MAXN];
int parent[MAXN];
int S, T;
bool flag;
bitset<MAXN> diam;

void comb(pll &p, pll q)
{
	if (q.se == 0) return;
	if (q.fi > p.fi) p = q;
	else if (q.fi == p.fi) p.se += q.se;
}
void gendist(int u)
{
	FOR(i, 0, N) depth[i] = INF;
	depth[u] = 0;
	vi nodes;
	nodes.PB(u);
	while(!nodes.empty())
	{
		int v = nodes.back();
		nodes.pop_back();
		for (int w : edge[v])
		{
			if (depth[w] != INF) continue;
			depth[w] = depth[v] + 1;
			nodes.PB(w);
		}
	}
	return;
}
void dfs(int u, int p)
{
	parent[u] = p;
	if (SZ(edge[u]) == 1)
	{
		dp[u] = MP(dist[flag][u], 1);
		return;
	}
	dp[u] = MP(0, 0);
	for (int v : edge[u])
	{
		if (v == p) continue;
		dfs(v, u);
		comb(dp[u], dp[v]);
	}
	ll tot = 0; int freq = 0;
	for (int v : edge[u])
	{
		if (v == p) continue;
		if (dp[v].fi == dp[u].fi)
		{
			freq++;
			tot += dp[v].se;
		}
	}
	pll opt = {0, 0};
	if (freq > 1)
	{
		opt.fi = 1ll * dist[flag][u] * (dp[u].fi + dp[u].fi - 2 * dist[flag][u]);
		for (int v : edge[u])
		{
			if (v == p) continue;
			if (dp[v].fi == dp[u].fi)
			{
				opt.se += (tot - dp[v].se) * (dp[v].se);
			}
		}
		opt.se /= 2;
	}
	else if (freq == 1)
	{
		for (int v : edge[u])
		{
			if (v == p) continue;
			if (dp[v].fi != dp[u].fi)
			{
				comb(opt, dp[v]);
			}
		}
		opt.se *= tot;
		opt.fi = 1ll * dist[flag][u] * (opt.fi + dp[u].fi - 2 * dist[flag][u]);
	}
	comb(ans, opt);
}
void dfs3(int u)
{
	if (SZ(edge[u]) == 1)
	{
		dp[u] = MP(dist[flag][u], 1);
		return;
	}
	dp[u] = MP(0, 0);
	for (int v : edge[u])
	{
		if (diam[v] || v == parent[u]) continue;
		parent[v] = u;
		dfs3(v);
		comb(dp[u], dp[v]);
	}
	if (dist[0][u] == dist[1][u])
	{
		ll tot = 0; int freq = 0;
		for (int v : edge[u])
		{
			if (diam[v] || v == parent[u]) continue;
			if (dp[v].fi == dp[u].fi)
			{
				freq++;
				tot += dp[v].se;
			}
		}
		pll opt = {0, 0};
		if (freq > 1)
		{
			opt.fi = 1ll * dist[flag][u] * (dp[u].fi + dp[u].fi - 2 * dist[flag][u]);
			for (int v : edge[u])
			{
				if (diam[v] || v == parent[u]) continue;
				if (dp[v].fi == dp[u].fi)
				{
					opt.se += (tot - dp[v].se) * (dp[v].se);
				}
			}
			opt.se /= 2;
		}
		else if (freq == 1)
		{
			//find the second biggest!
			for (int v : edge[u])
			{
				if (diam[v] || v == parent[u]) continue;
				if (dp[v].fi != dp[u].fi)
				{
					comb(opt, dp[v]);
				}
			}
			opt.se *= tot;
			opt.fi = 1ll * dist[flag][u] * (opt.fi + dp[u].fi - 2 * dist[flag][u]);
		}
		if (opt.fi == ans.fi) ans.se -= opt.se;
	}
}
void mark(int u, int p)
{
	for (int v : edge[u])
	{
		if (diam[v] || v == p) continue;
		depth[v] = depth[u] + 1;
		mark(v, u);
	}
}

int32_t main()
{
	ios_base::sync_with_stdio(0); cin.tie(0);
	// cout << fixed << setprecision(10);
	// cerr << fixed << setprecision(10);
	// if (fopen("file.in", "r"))
	// {
	// 	freopen ("file.in", "r", stdin);
	// 	freopen ("file.out", "w", stdout);
	// }
	cin >> N;
	FOR(i, 0, N - 1)
	{
		int u, v;
		cin >> u >> v;
		u--; v--;
		edge[u].PB(v); edge[v].PB(u);
	}
	gendist(0);
	FOR(i, 0, N)
	{
		if (depth[i] > depth[S])
		{
			S = i;
		}
	}
	vi nodes;
	nodes.PB(S);
	while(!nodes.empty())
	{
		int v = nodes.back();
		nodes.pop_back();
		for (int w : edge[v])
		{
			if (w == S || dist[0][w]) continue;
			dist[0][w] = dist[0][v] + 1;
			nodes.PB(w);
		}
	}
	FOR(i, 0, N)
	{
		if (dist[0][i] > dist[0][T]) T = i;
	}
	nodes.PB(T);
	while(!nodes.empty())
	{
		int v = nodes.back();
		nodes.pop_back();
		for (int w : edge[v])
		{
			if (w == T || dist[1][w]) continue;
			dist[1][w] = dist[1][v] + 1;
			nodes.PB(w);
		}
	}
	flag = true;
	for (int v : edge[T])
	{
		dfs(v, T);
	}
	parent[S] = N;
	flag = false;
	for (int v : edge[S])
	{
		dfs(v, S);
	}
	vi lol;
	int tmp = T;
	while(tmp != S)
	{
		diam[tmp] = true;
		lol.PB(tmp);
		tmp = parent[tmp];
	}
	diam[tmp] = true;
	lol.PB(tmp);
	FOR(i, 0, N) depth[i] = 0;
	FOR(i, 0, N)
	{
		if (!diam[i]) continue;
		for (int v : edge[i])
		{
			if (diam[v]) continue;
			depth[v] = 1;
			mark(v, i);
		}
	}
	tmp = 0;
	FOR(i, 0, N) ckmax(tmp, depth[i]);
	comb(ans, {dist[0][T] * tmp, 1});
	if (SZ(lol) % 2)
	{
		int mid = lol[SZ(lol) / 2];
		diam[mid] = false;
		FOR(i, 0, N) parent[i] = N;
		dfs3(mid);
	}
	cout << ans.fi << ' ' << ans.se << '\n';
	// cerr << "time elapsed = " << (clock() / (CLOCKS_PER_SEC / 1000)) << " ms" << endl;
	return 0;
}
/* READ READ READ
* int overflow, maxn too small, special cases (n=1?, two distinct?), cin.tie() interactive
* reread the problem, try small cases
* note down possible sources of error as you go
* do smth instead of nothing
*/

Subtask #1
19.0 / 19.0

# 결과 실행 시간 메모리 Grader output
1 Correct 13 ms 12160 KB Output is correct
2 Correct 13 ms 12160 KB Output is correct
3 Correct 13 ms 12160 KB Output is correct
4 Correct 16 ms 12160 KB Output is correct
5 Correct 15 ms 12288 KB Output is correct
6 Correct 12 ms 12160 KB Output is correct
7 Correct 15 ms 12160 KB Output is correct
8 Correct 16 ms 12160 KB Output is correct
9 Correct 13 ms 12160 KB Output is correct
10 Correct 14 ms 12160 KB Output is correct
11 Correct 13 ms 12132 KB Output is correct
12 Correct 13 ms 12160 KB Output is correct
13 Correct 13 ms 12160 KB Output is correct
14 Correct 12 ms 12160 KB Output is correct
15 Correct 14 ms 12160 KB Output is correct
16 Correct 15 ms 12132 KB Output is correct
17 Correct 13 ms 12160 KB Output is correct
18 Correct 13 ms 12160 KB Output is correct
19 Correct 14 ms 12160 KB Output is correct
20 Correct 16 ms 12280 KB Output is correct
21 Correct 16 ms 12160 KB Output is correct
22 Correct 18 ms 12160 KB Output is correct
23 Correct 16 ms 12288 KB Output is correct
24 Correct 17 ms 12160 KB Output is correct

Subtask #2
33.0 / 33.0

# 결과 실행 시간 메모리 Grader output
1 Correct 13 ms 12160 KB Output is correct
2 Correct 13 ms 12160 KB Output is correct
3 Correct 13 ms 12160 KB Output is correct
4 Correct 16 ms 12160 KB Output is correct
5 Correct 15 ms 12288 KB Output is correct
6 Correct 12 ms 12160 KB Output is correct
7 Correct 15 ms 12160 KB Output is correct
8 Correct 16 ms 12160 KB Output is correct
9 Correct 13 ms 12160 KB Output is correct
10 Correct 14 ms 12160 KB Output is correct
11 Correct 13 ms 12132 KB Output is correct
12 Correct 13 ms 12160 KB Output is correct
13 Correct 13 ms 12160 KB Output is correct
14 Correct 12 ms 12160 KB Output is correct
15 Correct 14 ms 12160 KB Output is correct
16 Correct 15 ms 12132 KB Output is correct
17 Correct 13 ms 12160 KB Output is correct
18 Correct 13 ms 12160 KB Output is correct
19 Correct 14 ms 12160 KB Output is correct
20 Correct 16 ms 12280 KB Output is correct
21 Correct 16 ms 12160 KB Output is correct
22 Correct 18 ms 12160 KB Output is correct
23 Correct 16 ms 12288 KB Output is correct
24 Correct 17 ms 12160 KB Output is correct
25 Correct 17 ms 12672 KB Output is correct
26 Correct 20 ms 12672 KB Output is correct
27 Correct 18 ms 12672 KB Output is correct
28 Correct 19 ms 12672 KB Output is correct
29 Correct 16 ms 12672 KB Output is correct
30 Correct 18 ms 12672 KB Output is correct
31 Correct 17 ms 12800 KB Output is correct
32 Correct 17 ms 12800 KB Output is correct
33 Correct 16 ms 12800 KB Output is correct
34 Correct 16 ms 12800 KB Output is correct
35 Correct 17 ms 12800 KB Output is correct
36 Correct 17 ms 12800 KB Output is correct
37 Correct 20 ms 12928 KB Output is correct
38 Correct 20 ms 12928 KB Output is correct
39 Correct 18 ms 12672 KB Output is correct
40 Correct 19 ms 12544 KB Output is correct
41 Correct 18 ms 12544 KB Output is correct
42 Correct 22 ms 12416 KB Output is correct
43 Correct 22 ms 12416 KB Output is correct
44 Correct 17 ms 12416 KB Output is correct
45 Correct 19 ms 12416 KB Output is correct
46 Correct 16 ms 12416 KB Output is correct
47 Correct 16 ms 12544 KB Output is correct
48 Correct 16 ms 12544 KB Output is correct

Subtask #3
0 / 48.0

# 결과 실행 시간 메모리 Grader output
1 Correct 13 ms 12160 KB Output is correct
2 Correct 13 ms 12160 KB Output is correct
3 Correct 13 ms 12160 KB Output is correct
4 Correct 16 ms 12160 KB Output is correct
5 Correct 15 ms 12288 KB Output is correct
6 Correct 12 ms 12160 KB Output is correct
7 Correct 15 ms 12160 KB Output is correct
8 Correct 16 ms 12160 KB Output is correct
9 Correct 13 ms 12160 KB Output is correct
10 Correct 14 ms 12160 KB Output is correct
11 Correct 13 ms 12132 KB Output is correct
12 Correct 13 ms 12160 KB Output is correct
13 Correct 13 ms 12160 KB Output is correct
14 Correct 12 ms 12160 KB Output is correct
15 Correct 14 ms 12160 KB Output is correct
16 Correct 15 ms 12132 KB Output is correct
17 Correct 13 ms 12160 KB Output is correct
18 Correct 13 ms 12160 KB Output is correct
19 Correct 14 ms 12160 KB Output is correct
20 Correct 16 ms 12280 KB Output is correct
21 Correct 16 ms 12160 KB Output is correct
22 Correct 18 ms 12160 KB Output is correct
23 Correct 16 ms 12288 KB Output is correct
24 Correct 17 ms 12160 KB Output is correct
25 Correct 17 ms 12672 KB Output is correct
26 Correct 20 ms 12672 KB Output is correct
27 Correct 18 ms 12672 KB Output is correct
28 Correct 19 ms 12672 KB Output is correct
29 Correct 16 ms 12672 KB Output is correct
30 Correct 18 ms 12672 KB Output is correct
31 Correct 17 ms 12800 KB Output is correct
32 Correct 17 ms 12800 KB Output is correct
33 Correct 16 ms 12800 KB Output is correct
34 Correct 16 ms 12800 KB Output is correct
35 Correct 17 ms 12800 KB Output is correct
36 Correct 17 ms 12800 KB Output is correct
37 Correct 20 ms 12928 KB Output is correct
38 Correct 20 ms 12928 KB Output is correct
39 Correct 18 ms 12672 KB Output is correct
40 Correct 19 ms 12544 KB Output is correct
41 Correct 18 ms 12544 KB Output is correct
42 Correct 22 ms 12416 KB Output is correct
43 Correct 22 ms 12416 KB Output is correct
44 Correct 17 ms 12416 KB Output is correct
45 Correct 19 ms 12416 KB Output is correct
46 Correct 16 ms 12416 KB Output is correct
47 Correct 16 ms 12544 KB Output is correct
48 Correct 16 ms 12544 KB Output is correct
49 Correct 1187 ms 68360 KB Output is correct
50 Correct 1161 ms 68544 KB Output is correct
51 Correct 1203 ms 68536 KB Output is correct
52 Correct 1194 ms 68520 KB Output is correct
53 Correct 978 ms 70080 KB Output is correct
54 Correct 948 ms 69548 KB Output is correct
55 Correct 1002 ms 69480 KB Output is correct
56 Correct 914 ms 69512 KB Output is correct
57 Correct 1161 ms 80972 KB Output is correct
58 Correct 1147 ms 80848 KB Output is correct
59 Correct 1145 ms 81004 KB Output is correct
60 Correct 1177 ms 81072 KB Output is correct
61 Correct 1578 ms 92652 KB Output is correct
62 Correct 1742 ms 92608 KB Output is correct
63 Incorrect 1870 ms 63472 KB Output isn't correct
64 Halted 0 ms 0 KB -