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Submission #555894

# Submission time Handle Problem Language Result Execution time Memory
555894 2022-05-01T18:41:24 Z Magi Park (BOI16_park) C++14
100 / 100
 525 ms 66396 KB 
#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#define ll long long
#define ld long double
#define f first
#define s second

using namespace std;

const int NMAX = 2100, QMAX = 1e5;
const ld eps = 1e-9;
int n, m, w, h, tata[NMAX+10], rang[NMAX+10], viz[NMAX+10], sol[QMAX+10];
vector <pair <ld, pair <int, int> > > edge;
pair <int, pair <int, int> > q[QMAX+10];

struct circle{
	ll x, y, r;
	ld minRadiusEdge(int t){
		if(!t)
			return (y - r) * 0.5 + eps;
		if(t == 1)
			return (w - x - r) * 0.5 + eps;
		if(t == 2)
			return (h - y - r) * 0.5 + eps;
		return (x - r) * 0.5 + eps;
	}
	ld minRadiusCircle(circle other){
		ld dist = sqrt((ld)((x - other.x) * (x - other.x) + (y - other.y) * (y - other.y)));
		return (dist - r - other.r) * 0.5 + eps;
	}
}v[NMAX+10];

int findDaddy(int x){
	int r = x, y = x;
	while(r != tata[r])
		r = tata[r];
	while(x != tata[x]){
		y = tata[x];
		tata[x] = r;
		x = y;
	}
	return r;
}

void unite(int x, int y){
	if(rang[x] < rang[y])
		tata[x] = y;
	else
		tata[y] = x;
	if(rang[x] == rang[y])
		rang[x]++;
}

int main(){

	ios_base::sync_with_stdio(false);
	cin.tie(0);

	cin >> n >> m >> w >> h;
	for(int i=1; i<=n; i++)
		cin >> v[i].x >> v[i].y >> v[i].r;

	for(int i=1; i<=n; i++){
		for(int t=0; t<4; t++){
			ld r = v[i].minRadiusEdge(t);
			edge.push_back({r, {i+3, t}});
		}
		for(int j=i+1; j<=n; j++){
			ld r = v[i].minRadiusCircle(v[j]);
			edge.push_back({r, {i+3, j+3}});
		}
	}

	sort(edge.begin(), edge.end());

	for(int i=1; i<=m; i++)
		cin >> q[i].f >> q[i].s.f, q[i].s.s = i;
	sort(q+1, q+m+1);

	for(int i=0; i<=n+3; i++)
		tata[i] = i, rang[i] = 1;

	int idx = 0;
	for(int i=1; i<=m; i++){
		while(idx < edge.size() && (ld)q[i].f > edge[idx].f){
			int val1 = findDaddy(edge[idx].s.f), val2 = findDaddy(edge[idx].s.s);
			idx++;
			if(val1 == val2)
				continue;
			unite(val1, val2);
		}
		for(int t=0; t<4; t++)
			viz[t] = findDaddy(t);

		int e = q[i].s.f - 1;
		bool ans[4];
		for(int t=0; t<4; t++)
			ans[t] = false;
		ans[e] = true;

		if(viz[e] != viz[(e+3)%4]){
			//adjacent counterclockwise
			if(viz[e] != viz[(e+2)%4] && viz[e] != viz[(e+1)%4])
				ans[(e+1)%4] = true;
			//opposite
			if(viz[e] != viz[(e+2)%4] && viz[(e+1)%4] != viz[(e+3)%4] && viz[(e+1)%4] != viz[(e+2)%4])
				ans[(e+2)%4] = true;
			//adjacent clockwise
			if(viz[(e+1)%4] != viz[(e+3)%4] && viz[(e+2)%4] != viz[(e+3)%4])
				ans[(e+3)%4] = true;
		}

		for(int t=0; t<4; t++)
			if(ans[t])
				sol[q[i].s.s] = sol[q[i].s.s] * 10 + (t + 1);
	}

	for(int i=1; i<=m; i++)
		cout << sol[i] << '\n';

	return 0;
}

Compilation message

park.cpp: In function 'int main()':
park.cpp:87:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long double, std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   87 |   while(idx < edge.size() && (ld)q[i].f > edge[idx].f){
      |         ~~~~^~~~~~~~~~~~~

Subtask #1
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 484 ms 66184 KB Output is correct
2 Correct 485 ms 66168 KB Output is correct
3 Correct 501 ms 66236 KB Output is correct
4 Correct 482 ms 66192 KB Output is correct
5 Correct 498 ms 66152 KB Output is correct
6 Correct 468 ms 66192 KB Output is correct
7 Correct 450 ms 66204 KB Output is correct
8 Correct 434 ms 66168 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct

Subtask #2
31.0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 38 ms 4048 KB Output is correct
2 Correct 44 ms 4068 KB Output is correct
3 Correct 43 ms 3952 KB Output is correct
4 Correct 43 ms 3992 KB Output is correct
5 Correct 40 ms 4044 KB Output is correct
6 Correct 39 ms 4120 KB Output is correct
7 Correct 38 ms 3364 KB Output is correct
8 Correct 39 ms 3364 KB Output is correct

Subtask #3
42.0 / 42.0

# Verdict Execution time Memory Grader output
1 Correct 484 ms 66184 KB Output is correct
2 Correct 485 ms 66168 KB Output is correct
3 Correct 501 ms 66236 KB Output is correct
4 Correct 482 ms 66192 KB Output is correct
5 Correct 498 ms 66152 KB Output is correct
6 Correct 468 ms 66192 KB Output is correct
7 Correct 450 ms 66204 KB Output is correct
8 Correct 434 ms 66168 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 38 ms 4048 KB Output is correct
12 Correct 44 ms 4068 KB Output is correct
13 Correct 43 ms 3952 KB Output is correct
14 Correct 43 ms 3992 KB Output is correct
15 Correct 40 ms 4044 KB Output is correct
16 Correct 39 ms 4120 KB Output is correct
17 Correct 38 ms 3364 KB Output is correct
18 Correct 39 ms 3364 KB Output is correct
19 Correct 525 ms 66368 KB Output is correct
20 Correct 502 ms 66332 KB Output is correct
21 Correct 500 ms 66384 KB Output is correct
22 Correct 519 ms 66336 KB Output is correct
23 Correct 487 ms 66396 KB Output is correct
24 Correct 488 ms 66332 KB Output is correct