oj.uz

Submission #667632

# Submission time Handle Problem Language Result Execution time Memory
667632 2022-12-01T20:20:06 Z dozer Roads (CEOI20_roads) C++14
0 / 100
 1 ms 340 KB 
#include <bits/stdc++.h>
using namespace std;
#define fileio() freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout)
#define fastio() cin.tie(0), ios_base::sync_with_stdio(0)
#define pb push_back
#define endl "\n"
#define sp " "
#define pii pair<int, int>
#define st first
#define nd second
#define N 100005
#define L(node) node * 2
#define R(node) node * 2 + 1
#define int long long

const int INF = 1e9 + 7;
const int modulo = 1e9 + 7;
int adj[N], done[N];
double x[N], y[N];
int ox[N], oy[N];

int32_t main()
{
	//fileio();
	fastio();

	int n;
	cin>>n;
	vector<int> vec;
	int a, b;
	for (int i = 1; i <= n; i++)
	{
		int x1, x2, y1, y2;
		cin>>x1>>y1>>x2>>y2;
		a = x1 - x2;
		b = y1 - y2;
		int u = 2 * i - 1, v = 2 * i;
		x[u] = x1, y[u] = y1;
		x[v] = x2, y[v] = y2;

		adj[u] = v;
		adj[v] = u;

		vec.pb(u);
		vec.pb(v);
	}
	//cout<<a<<sp<<b<<endl;
	double hyp = sqrt(a * a + b * b);
	for (int i = 1; i <= 2 * n; i++)
	{
		ox[i] = x[i], oy[i] = y[i];
		if (x[i] == y[i] && x[i] == 0) continue;
		double hyp2 = sqrt(x[i] * x[i] + y[i] * y[i]);
		double cos = x[i] / hyp2, sin = y[i] / hyp2;
		//cout<<hyp<<sp<<hyp2<<sp<<cos<<sp<<sin<<endl;
		y[i] = hyp2 * ((a / hyp) * sin + cos * (b / hyp));
		x[i] = hyp2 * ((a / hyp) * cos - sin * (b / hyp));
		//cout<<x[i]<<sp<<y[i]<<endl;
	}
	sort(vec.begin(), vec.end(), [&](int a, int b){
		return make_pair(y[a], x[a]) < make_pair(y[b], x[b]); 
	});
	for (auto i : vec) cout<<i<<sp;
	cout<<endl;
	vector<array<int, 4>> ans;
	set<pair<pair<double, double>, int>> s;
	done[adj[vec.front()]] = 1;
	for (auto i : vec)
	{
		if (done[i] == 0 && !s.empty())
		{
			//cout<<i<<endl;
			auto it = s.lower_bound({{x[i], (double)-modulo}, 0});
			if (it == s.end()) it--;
			pair<double, double> tmp = it->st;
			int ind = it->nd;
			ans.pb({ox[i], oy[i], ox[ind], oy[ind]});
			done[i] = 1;
			done[adj[i]] = 1;
		}
		s.insert({{x[i], -y[i]}, i});
	}

	for (auto i : ans)
	{
		for (int j = 0; j < 4; j++) cout<<i[j]<<sp;
		cout<<endl;
	}

	cerr<<"time taken : "<<(float)clock() / CLOCKS_PER_SEC<<" seconds\n";
}

Compilation message

roads.cpp: In function 'int32_t main()':
roads.cpp:75:25: warning: variable 'tmp' set but not used [-Wunused-but-set-variable]
   75 |    pair<double, double> tmp = it->st;
      |                         ^~~
roads.cpp:48:30: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized]
   48 |  double hyp = sqrt(a * a + b * b);
      |                            ~~^~~
roads.cpp:48:22: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized]
   48 |  double hyp = sqrt(a * a + b * b);
      |                    ~~^~~

Subtask #1
0 / 0.0

# Verdict Execution time Memory Grader output
1 Failed 0 ms 340 KB Condition failed: "iB != P2I.end()"
2 Halted 0 ms 0 KB -

Subtask #2
0 / 15.0

# Verdict Execution time Memory Grader output
1 Failed 1 ms 340 KB Condition failed: "iA != P2I.end()"
2 Halted 0 ms 0 KB -

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Failed 1 ms 340 KB Condition failed: "iA != P2I.end()"
2 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Failed 0 ms 340 KB Condition failed: "iA != P2I.end()"
2 Halted 0 ms 0 KB -

Subtask #5
0 / 15.0

# Verdict Execution time Memory Grader output
1 Failed 0 ms 340 KB Condition failed: "iB != P2I.end()"
2 Halted 0 ms 0 KB -

Subtask #6
0 / 40.0

# Verdict Execution time Memory Grader output
1 Failed 0 ms 340 KB Condition failed: "iB != P2I.end()"
2 Halted 0 ms 0 KB -