Submission #428613

#	Time	Username	Problem	Language	Result	Execution time	Memory
428613		pavement	Park (JOI17_park)	C++17	27 / 100	345 ms	460 KiB

park

#include "park.h"
#include <bits/stdc++.h>
using namespace std;

mt19937 rng(238479);

#define mp make_pair
#define mt make_tuple
#define pb push_back

static int N, Place[1405], link[1405], sz[1405];
map<tuple<int, int, vector<int> >, bool> ret;

bool query(int a, int b, int Place[]) {
	vector<int> tmp;
	for (int i = 0; i < N; i++) tmp.pb(Place[i]);
	if (ret.find(mt(a, b, tmp)) != ret.end()) return ret[mt(a, b, tmp)];
	else return ret[mt(a, b, tmp)] = Ask(a, b, Place);
}

int find(int x) {
	if (x == link[x]) return x;
	return link[x] = find(link[x]);
}

void unite(int a, int b) {
	a = find(a);
	b = find(b);
	if (a == b) return;
	if (sz[b] > sz[a]) swap(a, b);
	sz[a] += sz[b];
	link[b] = a;
}

void solve(int l, int r) {
	if (find(l) == find(r)) return;
	memset(Place, 0, sizeof Place);
	Place[l] = Place[r] = 1;
	if (l >= r ? Ask(r, l, Place) : Ask(l, r, Place)) {
		l >= r ? Answer(r, l) : Answer(l, r);
		unite(l, r);
		return;
	}
	int lo = 0, hi = N - 1, ans = -1;
	while (lo <= hi) {
		int mid = (lo + hi) / 2;
		memset(Place, 0, sizeof Place);
		for (int i = mid; i < N; i++)
			Place[i] = 1;
		Place[l] = Place[r] = 1;
		if (l >= r ? Ask(r, l, Place) : Ask(l, r, Place)) ans = mid, lo = mid + 1;
		else hi = mid - 1;
	}
	solve(l, ans);
	solve(ans, r);
}

void Detect(int T, int N) {
	::N = N;
	for (int i = 0; i < N; i++) {
		link[i] = i;
		sz[i] = 1;
	}
	vector<int> tmp;
	int root = (T == 4 ? rng() % N : 0);
	for (int i = 0; i < N; i++)
		if (i != root) tmp.pb(i);
	shuffle(tmp.begin(), tmp.end(), rng);
	for (int i : tmp) solve(root, i);
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 27 / 27
• Subtask 4: 0 / 30
• Subtask 5: 0 / 23