oj.uz

Submission #201313

# Submission time Handle Problem Language Result Execution time Memory
201313 2020-02-10T07:44:04 Z dimash241 Meetings (JOI19_meetings) C++17
29 / 100
 2000 ms 1672 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 go (int v) {
	u[v] = 1;
	for (auto to : g[v]) deg[to]--;
	for (auto to : g[v]) if (deg[to] == 0 && !u[to]) {
		PrintOut(v, to);
		go(to);
	}
	
}

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];
	}

	go(p[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
7.0 / 7.0

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

Subtask #2
10.0 / 10.0

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

Subtask #3
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 376 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 376 KB Output is correct
5 Correct 5 ms 376 KB Output is correct
6 Correct 4 ms 376 KB Output is correct
7 Correct 4 ms 380 KB Output is correct
8 Correct 5 ms 376 KB Output is correct
9 Correct 5 ms 504 KB Output is correct
10 Correct 5 ms 504 KB Output is correct
11 Correct 5 ms 504 KB Output is correct
12 Correct 5 ms 504 KB Output is correct
13 Correct 4 ms 376 KB Output is correct
14 Correct 6 ms 504 KB Output is correct
15 Correct 6 ms 376 KB Output is correct
16 Correct 5 ms 504 KB Output is correct
17 Correct 6 ms 376 KB Output is correct
18 Correct 5 ms 504 KB Output is correct
19 Correct 6 ms 376 KB Output is correct
20 Correct 6 ms 504 KB Output is correct
21 Correct 6 ms 504 KB Output is correct
22 Correct 6 ms 504 KB Output is correct
23 Correct 5 ms 376 KB Output is correct
24 Correct 5 ms 376 KB Output is correct
25 Correct 6 ms 376 KB Output is correct
26 Correct 6 ms 504 KB Output is correct
27 Correct 160 ms 960 KB Output is correct
28 Correct 167 ms 1016 KB Output is correct
29 Correct 164 ms 888 KB Output is correct
30 Correct 162 ms 1140 KB Output is correct
31 Correct 179 ms 888 KB Output is correct
32 Correct 179 ms 944 KB Output is correct
33 Correct 166 ms 1012 KB Output is correct
34 Correct 164 ms 1168 KB Output is correct
35 Correct 154 ms 1140 KB Output is correct
36 Correct 155 ms 1016 KB Output is correct
37 Correct 248 ms 888 KB Output is correct
38 Correct 239 ms 760 KB Output is correct
39 Correct 212 ms 632 KB Output is correct

Subtask #4
0 / 71.0

# Verdict Execution time Memory Grader output
1 Execution timed out 3085 ms 1672 KB Time limit exceeded
2 Halted 0 ms 0 KB -