oj.uz

Submission #201315

# Submission time Handle Problem Language Result Execution time Memory
201315 2020-02-10T07:46:58 Z dimash241 Meetings (JOI19_meetings) C++17
29 / 100
 2000 ms 1764 KB 
//#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 deg[2020];
int u[2020];

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

void Bridge (int, int);
int Query (int, int, int);
vector < pair < int, int > > v;

void PrintOut(int a, int b) {
	if (a > b) swap(a, b);
	v.pb(mp(a, b));
	if (sz(v) == n) {
		for (auto it : v)
			cout << it.F << ' ' << it.S << '\n';
		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 Solve(int N) {
	n = N;
	vector < int > p(n, 0);
	for (int i = 0; i < n; i ++) {
		g[i].clear();
		deg[i] = 0;
		u[i] = 0;
		p[i] = i;
	}  	

	for (int i = 1; i < n; ++i) {
		g[0].push_back(i);
		for (int j = i + 1; j < n; ++j) {
			int x = Query(0, i, j);
			if (x != j) g[x].pb(j);
			if (x != i) g[x].pb(i);
		}
	}

	for (int i = 0; i < n; i ++) {
		reduce(g[i]);
		for (auto j : g[i])
			++deg[j];
	}
	queue < int > q;
	q.push(0);
	while(q.size()) {
		int v = q.front();
		q.pop();
		u[v] = 1;

		for (auto to : g[v]) deg[to]--;
		for (auto to : g[v]) if (deg[to] == 0 && !u[to]) {
			PrintOut(v, to);
			q.push(to);
		}
	}
}

/*
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
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 504 KB Output is correct
2 Correct 5 ms 376 KB Output is correct
3 Correct 5 ms 376 KB Output is correct
4 Correct 5 ms 380 KB Output is correct
5 Correct 5 ms 376 KB Output is correct
6 Correct 5 ms 376 KB Output is correct
7 Correct 5 ms 376 KB Output is correct
8 Correct 5 ms 376 KB Output is correct
9 Correct 5 ms 376 KB Output is correct
10 Correct 4 ms 376 KB Output is correct
11 Correct 5 ms 376 KB Output is correct
12 Correct 5 ms 376 KB Output is correct
13 Correct 5 ms 504 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 504 KB Output is correct
2 Correct 5 ms 376 KB Output is correct
3 Correct 5 ms 376 KB Output is correct
4 Correct 5 ms 380 KB Output is correct
5 Correct 5 ms 376 KB Output is correct
6 Correct 5 ms 376 KB Output is correct
7 Correct 5 ms 376 KB Output is correct
8 Correct 5 ms 376 KB Output is correct
9 Correct 5 ms 376 KB Output is correct
10 Correct 4 ms 376 KB Output is correct
11 Correct 5 ms 376 KB Output is correct
12 Correct 5 ms 376 KB Output is correct
13 Correct 5 ms 504 KB Output is correct
14 Correct 5 ms 376 KB Output is correct
15 Correct 5 ms 376 KB Output is correct
16 Correct 5 ms 508 KB Output is correct
17 Correct 5 ms 376 KB Output is correct
18 Correct 5 ms 376 KB Output is correct
19 Correct 5 ms 376 KB Output is correct
20 Correct 5 ms 504 KB Output is correct
21 Correct 6 ms 376 KB Output is correct
22 Correct 6 ms 504 KB Output is correct
23 Correct 7 ms 632 KB Output is correct
24 Correct 6 ms 380 KB Output is correct
25 Correct 6 ms 504 KB Output is correct
26 Correct 6 ms 380 KB Output is correct

Subtask #3
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 504 KB Output is correct
2 Correct 5 ms 376 KB Output is correct
3 Correct 5 ms 376 KB Output is correct
4 Correct 5 ms 380 KB Output is correct
5 Correct 5 ms 376 KB Output is correct
6 Correct 5 ms 376 KB Output is correct
7 Correct 5 ms 376 KB Output is correct
8 Correct 5 ms 376 KB Output is correct
9 Correct 5 ms 376 KB Output is correct
10 Correct 4 ms 376 KB Output is correct
11 Correct 5 ms 376 KB Output is correct
12 Correct 5 ms 376 KB Output is correct
13 Correct 5 ms 504 KB Output is correct
14 Correct 5 ms 376 KB Output is correct
15 Correct 5 ms 376 KB Output is correct
16 Correct 5 ms 508 KB Output is correct
17 Correct 5 ms 376 KB Output is correct
18 Correct 5 ms 376 KB Output is correct
19 Correct 5 ms 376 KB Output is correct
20 Correct 5 ms 504 KB Output is correct
21 Correct 6 ms 376 KB Output is correct
22 Correct 6 ms 504 KB Output is correct
23 Correct 7 ms 632 KB Output is correct
24 Correct 6 ms 380 KB Output is correct
25 Correct 6 ms 504 KB Output is correct
26 Correct 6 ms 380 KB Output is correct
27 Correct 156 ms 940 KB Output is correct
28 Correct 159 ms 1016 KB Output is correct
29 Correct 152 ms 1044 KB Output is correct
30 Correct 158 ms 1060 KB Output is correct
31 Correct 157 ms 888 KB Output is correct
32 Correct 192 ms 972 KB Output is correct
33 Correct 156 ms 1008 KB Output is correct
34 Correct 149 ms 1012 KB Output is correct
35 Correct 145 ms 1016 KB Output is correct
36 Correct 163 ms 1148 KB Output is correct
37 Correct 249 ms 888 KB Output is correct
38 Correct 241 ms 760 KB Output is correct
39 Correct 219 ms 700 KB Output is correct

Subtask #4
0 / 71.0

# Verdict Execution time Memory Grader output
1 Execution timed out 3072 ms 1764 KB Time limit exceeded
2 Halted 0 ms 0 KB -