Submission #69915

#	Time	Username	Problem	Language	Result	Execution time	Memory
69915		qkxwsm	Cats or Dogs (JOI18_catdog)	C++17	38 / 100	3035 ms	51620 KiB

catdog

#include "catdog.h"
#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>

using namespace std;
using namespace __gnu_pbds;

struct chash
{
	int operator()(int x) const
	{
		x ^= (x >> 20) ^ (x >> 12);
		return x ^ (x >> 7) ^ (x >> 4);
	}
	int operator()(long long x) const
	{
		return x ^ (x >> 32);
	}
};

template<typename T> using orderedset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template<typename T, typename U> using hashtable = gp_hash_table<T, U, chash>;

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);
}
template<class T, class U>
T normalize(T x, U mod = 1000000007)
{
	return (((x % mod) + mod) % mod);
}
static long long randomizell(long long mod)
{
	return ((1ll << 45) * rand() + (1ll << 30) * rand() + (1ll << 15) * rand() + rand()) % mod;
}
static int randomize(int mod)
{
	return ((1ll << 15) * rand() + rand()) % mod;
}

#define y0 ___y0
#define y1 ___y1
#define MP make_pair
#define MT make_tuple
#define PB push_back
#define PF push_front
#define LB lower_bound
#define UB upper_bound
#define fi first
#define se second
#define debug(x) cerr << #x << " = " << x << endl;

const long double PI = 4.0 * atan(1.0);
const long double EPS = 1e-10;

#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 100013

typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<ld, ld> pdd;

int N;
vector<int> edge[MAXN];
int parent[MAXN], depth[MAXN];
int heavy[MAXN], head[MAXN], ranking[MAXN], subtree[MAXN], siz[MAXN];
int arr[MAXN];
pll dp[MAXN];
pll big[3] = {{0, 0}, {0, INF}, {INF, 0}};

pll operator + (const pll &a, const pll &b)
{
	return {a.fi + b.fi, a.se + b.se};
}
pll operator - (const pll &a, const pll &b)
{
	return {a.fi - b.fi, a.se - b.se};
}
pll trans(int u, int v)
{
	return big[v] - big[u];
}
void dfs(int u)
{
	subtree[u] = 1;
	for (int v : edge[u])
	{
		if (v == parent[u]) continue;
		parent[v] = u;
		depth[v] = depth[u] + 1;
		dfs(v);
		subtree[u] += subtree[v];
	}
	heavy[u] = N;
	for (int v : edge[u])
	{
		if (v == parent[u]) continue;
		if (subtree[v] * 2 >= subtree[u]) heavy[u] = v;
	}
}
void dfs_heavy(int u)
{
	if (heavy[u] != N)
	{
		head[heavy[u]] = head[u];
		ranking[heavy[u]] = ranking[u] + 1;
		dfs_heavy(heavy[u]);
	}
	for (int v : edge[u])
	{
		if (v == parent[u]) continue;
		if (v == heavy[u]) continue;
		ranking[v] = 0;
		head[v] = v;
		dfs_heavy(v);
	}
	return;
}
void initialize(int n, vector<int> a, vector<int> b)
{
	N = n;
	for (int i = 0; i < N - 1; i++)
	{
		int u = a[i], v = b[i];
		u--; v--;
		edge[u].PB(v);
		edge[v].PB(u);
	}
	parent[N] = N; parent[0] = N;
	dfs(0);
	dfs_heavy(0);
	for (int i = 0; i < N; i++)
	{
		arr[i] = -1;
	}
}
void upd(int u, pll p)
{
	pll was = {min(dp[u].fi, dp[u].se + 1), min(dp[u].se, dp[u].fi + 1)};
	dp[u] = dp[u] + p;
	pll cur = {min(dp[u].fi, dp[u].se + 1), min(dp[u].se, dp[u].fi + 1)};
	if (u == 0)
	{
		return;
	}
	upd(parent[u], cur - was);
}
int setval(int u, int v)
{
	pll change = trans(arr[u], v);
	arr[u] = v;
	upd(u, change);
	return min(dp[0].fi, dp[0].se);
}
int cat(int u)
{
	u--;
	return setval(u, 1);
}
int dog(int u)
{
	u--;
	return setval(u, 2);
}
int neighbor(int u)
{
	u--;
	return setval(u, 0);
}

Compilation message (stderr)

catdog.cpp:44:12: warning: 'int randomize(int)' defined but not used [-Wunused-function]
 static int randomize(int mod)
            ^~~~~~~~~
catdog.cpp:40:18: warning: 'long long int randomizell(long long int)' defined but not used [-Wunused-function]
 static long long randomizell(long long mod)
                  ^~~~~~~~~~~

• Subtask 1: 8 / 8
• Subtask 2: 30 / 30
• Subtask 3: 0 / 62