oj.uz

Submission #430210

# Submission time Handle Problem Language Result Execution time Memory
430210 2021-06-16T12:08:45 Z 8e7 Park (JOI17_park) C++14
67 / 100
 1155 ms 588 KB 
#include "park.h"
//Challenge: Accepted
#include <iostream>
#include <vector>
#include <algorithm>
#include <utility>
#include <random>
#include <time.h>
#include <assert.h>
#include <unordered_map>
#include <ext/pb_ds/assoc_container.hpp> // Common file
#include <ext/pb_ds/tree_policy.hpp> // Including tree_order_statistics_node_update
using namespace std;
//using namespace __gnu_pbds;
void debug() {cout << endl;}
template <class T, class ...U> void debug(T a, U ... b) { cout << a << " "; debug(b...);}
template <class T> void pary(T l, T r) {
	while (l != r) {cout << *l << " ";l++;}
	cout << endl;
}
#define ll long long
#define ld long double
#define maxn 1405
#define mod 1000000007
#define pii pair<long long, long long>
#define ff first
#define ss second

static int que[maxn];
vector<pii> ed;
int qcnt = 0;
void group(vector<int> root, vector<int> nom, int cent, vector<vector<int> > & rec);
int query(int a, int b) {
	if (a > b) swap(a, b);
	if (a == b || (que[a] == 0) || (que[b] == 0)) return 0;
	qcnt++;
	return Ask(a, b, que);
}


void solve(vector<int> v) {
	//pary(v.begin(), v.end());
	if (v.size() < 2) return;
	if (v.size() == 2) {
		ed.push_back({v[0], v[1]});
		return;
	}
	//debug(v.size());
	random_shuffle(v.begin(), v.end());
	int cent = v[0];
	for (int i = 0;i < maxn;i++) que[i] = 0;
	for (int i:v) que[i] = 1;
	if (v.size() > 5) {
		int num = 5, ma = 0, best = 0, f = 0;
		for (int i:v) {	
			que[i] = 0;
			int cnt = 0;
			for (int j = 0;j < num;j++) {
				int ix = rand() % v.size(), iy = rand() % v.size();
				if (v[ix] == i) ix = (ix + 1) % v.size();
				while (iy == ix || v[iy] == i) {
					iy = (iy + 1) % v.size();
				}
				cnt += query(v[ix], v[iy]) ? 0 : 1;	
			}
			que[i] = 1;
			if (cnt > ma) {
				ma = cnt, best = i;
			}
			if (cnt > (num / 2)) {
				cent = i, f = 1;
				break;
			}
		}
		if (!f) cent = best;
	}
		
	//debug(cent);
	for (int i:v) que[i] = 0;
	que[cent] = 1;
	vector<int> adj, sub;
	for (int i:v) {
		if (i == cent) continue;
		que[i] = 1;
		if (query(i, cent)) {
			ed.push_back({i, cent}), adj.push_back(i);
		} else {
			sub.push_back(i);
		}
		que[i] = 0;
	}
	for (int i:v) que[i] = 1;
	vector<vector<int> > rec;
	group(adj, sub, cent, rec);
	for (int i:v) que[i] = 0;
	int siz = 0;
	//debug(cent);
	for (auto i:rec) {
		siz += i.size();
		solve(i);
	}
	//assert(siz == v.size() - 1);
}
void group(vector<int> root, vector<int> nom, int cent, vector<vector<int> > &rec) {
	if (root.size() == 0) return;
	if (root.size() == 1) {
		nom.push_back(root[0]);
		rec.push_back(nom);
		return;
	}
	vector<int> ar, br, an, bn;
	for (int i = 0;i < root.size();i++) {
		if (i < (root.size() / 2)) ar.push_back(root[i]);
		else br.push_back(root[i]);
	}
	for (int i:ar) que[i] = 0;	
	for (int i:nom) {
		if (!query(i, cent)) {
			an.push_back(i);	
		} else {
			bn.push_back(i);
		}
	}
	for (int i:ar) que[i] = 1;
	group(ar, an, cent, rec), group(br, bn, cent, rec);
}
void Detect(int T, int N) {
	srand(time(NULL));
	vector<int> ini;
	for (int i = 0;i < N;i++) ini.push_back(i);
	solve(ini);
	//debug(qcnt);
	//assert(ed.size() == N - 1);
	for (auto i:ed) {
		if (i.ff > i.ss) swap(i.ff, i.ss);
		Answer(i.ff, i.ss);
	}
}
/*

4
10 9
0 1
0 2
1 3
2 4
1 5
2 6
2 7
7 8
5 9

4
8 7
0 1
0 2
0 3
0 4
0 5
0 6
0 7
*/

Compilation message

park.cpp: In function 'void group(std::vector<int>, std::vector<int>, int, std::vector<std::vector<int> >&)':
park.cpp:112:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  112 |  for (int i = 0;i < root.size();i++) {
      |                 ~~^~~~~~~~~~~~~
park.cpp:113:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  113 |   if (i < (root.size() / 2)) ar.push_back(root[i]);
      |       ~~^~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 204 KB Wrong Answer[2]
2 Halted 0 ms 0 KB -

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 92 ms 556 KB Output is correct
2 Correct 43 ms 556 KB Output is correct
3 Correct 47 ms 584 KB Output is correct
4 Correct 60 ms 460 KB Output is correct
5 Correct 88 ms 512 KB Output is correct

Subtask #3
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 147 ms 548 KB Output is correct
2 Correct 141 ms 484 KB Output is correct
3 Correct 190 ms 448 KB Output is correct
4 Correct 105 ms 440 KB Output is correct
5 Correct 270 ms 408 KB Output is correct
6 Correct 315 ms 540 KB Output is correct
7 Correct 119 ms 412 KB Output is correct
8 Correct 169 ms 440 KB Output is correct

Subtask #4
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 67 ms 404 KB Output is correct
2 Correct 99 ms 572 KB Output is correct
3 Correct 79 ms 456 KB Output is correct
4 Correct 134 ms 516 KB Output is correct
5 Correct 83 ms 440 KB Output is correct
6 Correct 109 ms 460 KB Output is correct
7 Correct 106 ms 472 KB Output is correct
8 Correct 136 ms 520 KB Output is correct
9 Correct 155 ms 448 KB Output is correct
10 Correct 94 ms 572 KB Output is correct
11 Correct 84 ms 512 KB Output is correct
12 Correct 126 ms 588 KB Output is correct
13 Correct 185 ms 568 KB Output is correct
14 Correct 113 ms 580 KB Output is correct
15 Correct 88 ms 444 KB Output is correct
16 Correct 144 ms 528 KB Output is correct
17 Correct 71 ms 580 KB Output is correct
18 Correct 93 ms 544 KB Output is correct
19 Correct 66 ms 500 KB Output is correct
20 Correct 144 ms 456 KB Output is correct

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 1155 ms 492 KB Wrong Answer[5]
2 Halted 0 ms 0 KB -