Submission #201434

#	Time	Username	Problem	Language	Result	Execution time	Memory
201434		dimash241	Meetings (JOI19_meetings)	C++17	100 / 100	1203 ms	1068 KiB

meetings

//#pragma GCC target("avx2")
//#pragma GCC optimize("O3")
 
//# include <x86intrin.h>
#include "meetings.h"
 
# include <bits/stdc++.h>
 
# include <ext/pb_ds/assoc_container.hpp>
# include <ext/pb_ds/tree_policy.hpp>
 
using namespace __gnu_pbds;
using namespace std;
 
template<typename T> using ordered_set = tree <T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
 
#define _USE_MATH_DEFINES_
#define ll long long
#define ld long double
#define Accepted 0
#define pb push_back
#define mp make_pair
#define sz(x) (int)(x.size())
#define every(x) x.begin(),x.end()
#define F first
#define S second
#define lb lower_bound
#define ub upper_bound
#define For(i,x,y)  for (ll i = x; i <= y; i ++) 
#define FOr(i,x,y)  for (ll i = x; i >= y; i --)
#define SpeedForce ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0)
// ROAD to...                                                                                                                                                                                                                Red
 
inline void Input_Output () {
	//freopen(".in", "r", stdin);
   //freopen(".out", "w", stdout);
}
 
const int dx[] = {-1, 0, 1, 0};
const int dy[] = {0, -1, 0, 1};
 
int n, m, k;
vector < int > g[2020];
int e[2020][2020];
int deg[2020];
int u[2020];

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
	 
 
void Bridge (int, int);
int Query (int, int, int);
int opera = 0;
map < pair < int, int > , int > was;
 
void PrintOut(int a, int b) {
	if (a > b) swap(a, b);
	opera++;
	if (opera == n) {
		assert(0);
	}
//	cerr << ' ' << a << ' ' << b << ' ' << opera << '\n';
//	if (opera == 1) exit(0);
	Bridge(a, b);
}
 
void reduce (vector < int > &v) {
	sort(every(v));
	v.resize(unique(every(v)) - v.begin());
	random_shuffle(every(v));
}

void go (int v) {
	if (g[v].empty()) return;
//	reduce(g[v]);
	vector < int > cur;
	cur.swap(g[v]);

	int len = cur.size();
	int y = cur[rng() % len];
	int x = v; 
	set < int > s;
	s.insert(v);
	s.insert(y);
	for (int z : cur) if (z != y) {
	//	cout << x << ' ' << y << ' ' << z << '\n';
		int t = Query(x, y, z);
		s.insert(t);

		if (t != z) g[t].pb(z);
	}
	//exit(0);
	vector < int > ord(s.begin(), s.end());
//	for (auto it : ord) cout << it << ' ';
//	exit(0);
	sort(every(ord), [&](int y, int z) { 
		return (x == y) || ((x != z) && Query(x, y, z) == y); 
	} );

//	cout << sz(ord);
//	exit(0);

	for (int i = 1; i < sz(ord); ++i) {
		PrintOut(ord[i-1], ord[i]);
	}
	for (auto it : ord)
		go(it);
}
 
 
void Solve(int N) {
	n = N;
	opera = 0;
	for (int i = 1; i < n; ++i)
		g[0].pb(i);
	go(0);
}
 
/* 
namespace {
 
const int MAX_N = 2000;
const int MAX_CALLS = 100000;
 
void WrongAnswer(int code) {
  printf("Wrong Answer [%d]\n", code);
  exit(0);
}
 
int N, num_calls;
std::vector<int> graph[MAX_N];
std::set<std::pair<int, int>> edges, edges_reported;
 
int weight[MAX_N];
 
bool Visit(int p, int e, int rt = -1) {
  if (p == e) {
    ++weight[p];
    return true;
  }
  for (int q : graph[p]) {
    if (q != rt) {
      if (Visit(q, e, p)) {
        ++weight[p];
        return true;
      }
    }
  }
  return false;
}
 
}  // namespace
 
int Query(int u, int v, int w) {
  if (!(0 <= u && u <= N - 1 && 0 <= v && v <= N - 1 && 0 <= w && w <= N - 1 &&
        u != v && u != w && v != w)) {
    WrongAnswer(1);
  }
  if (++num_calls > MAX_CALLS) {
    WrongAnswer(2);
  }
  std::fill(weight, weight + N, 0);
  Visit(u, v);
  Visit(u, w);
  Visit(v, w);
  for (int x = 0; x < N; ++x) {
    if (weight[x] == 3) {
      return x;
    }
  }

  printf("Error: the input may be invalid\n");
  exit(0);
}
 
void Bridge(int u, int v) {
  if (!(0 <= u && u < v && v <= N - 1)) {
    WrongAnswer(3);
  }
  if (!(edges.count(std::make_pair(u, v)) >= 1)) {
    WrongAnswer(4);
  }
  if (!(edges_reported.count(std::make_pair(u, v)) == 0)) {
    WrongAnswer(5);
  }
  edges_reported.insert(std::make_pair(u, v));
}
 
int main() {
  if (scanf("%d", &N) != 1) {
    fprintf(stderr, "Error while reading input\n");
    exit(1);
  }
  for (int i = 0; i < N - 1; ++i) {
    int u, v;
    if (scanf("%d%d", &u, &v) != 2) {
      fprintf(stderr, "Error while reading input\n");
      exit(1);
    }
    graph[u].push_back(v);
    graph[v].push_back(u);
    edges.insert(std::make_pair(u, v));
  }
 
  num_calls = 0;
  Solve(N);
  if (edges_reported.size() != static_cast<size_t>(N - 1)) {
    WrongAnswer(6);
  }
  printf("Accepted: %d\n", num_calls);
  return 0;
}
 
// B...a   */

• Subtask 1: 7 / 7
• Subtask 2: 10 / 10
• Subtask 3: 12 / 12
• Subtask 4: 71 / 71