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답안 #131985

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
131985 2019-07-18T07:19:32 Z 이온조(#3189) Fences (JOI18_fences) C++14
51 / 100
 1000 ms 52044 KB 
#include <bits/stdc++.h>
using namespace std;
using pii = pair<int, int>;
using pid = pair<int, double>;
using pdi = pair<double, int>;
using pdd = pair<double, double>;
#define X first
#define Y second

const double eps = 1e-6;

struct line { pdd S, E; };
struct dot { pdd D; int id; bool ps; };
struct node { double v; int c, id; };

bool operator <(node PP, node QQ) { return PP.v > QQ.v; }

inline double f(double x) { return max(x, -x); }
inline double dst(pdd A, pdd B) { return sqrt((A.X-B.X) * (A.X-B.X) + (A.Y-B.Y) * (A.Y-B.Y)); }
inline double CCW(pdd A, pdd B, pdd C) { return A.X*B.Y + B.X*C.Y + C.X*A.Y - A.Y*B.X - B.Y*C.X - C.Y*A.X; }
inline int CCWs(pdd A, pdd B, pdd C) {
	int tmp = CCW(A, B, C);
	if(tmp < 0) return -1;
	if(tmp > 0) return +1;
	if(tmp == 0) return 0;
}
inline bool on(line A, pdd B) {
	if(A.S > A.E) swap(A.S, A.E);
	if(B < A.S || A.E < B) return false;
	return f(CCW(A.S, A.E, B) / dst(A.S, A.E)) < eps;
}
inline bool its(line A, line B) { // strict
	if(on(A, B.S) || on(A, B.E) || on(B, A.S) || on(B, A.E)) return false;
	return CCWs(A.S, A.E, B.S) * CCWs(A.S, A.E, B.E) == -1 && CCWs(B.S, B.E, A.S) * CCWs(B.S, B.E, A.E) == -1;
}
inline pdd push(line A, pdd B) {
	double ds = dst(A.S, A.E);
	double d = f(CCW(A.S, A.E, B) / ds);
	double dx = A.S.Y - A.E.Y, dy = A.E.X - A.S.X;
	pdd PA = {B.X + dx * (d/ds), B.Y + dy * (d/ds)};
	pdd PB = {B.X - dx * (d/ds), B.Y - dy * (d/ds)};
	if(dst(PA, A.S) > dst(PB, A.S)) swap(PA, PB);
	return PA;
}

line I = {{0.0, 0.0}, {1000.0, 1.0}};
vector<dot> T;
vector<pid> adj[100009];
line A[111];
int N, S, K;
double ans = 1e9, D[2][100009];
bool chk[111];

inline bool ok(line L) {
	bool f = 0;
	f |= its(L, {{S, S}, {S, -S}});
	f |= its(L, {{S, -S}, {-S, -S}});
	f |= its(L, {{-S, -S}, {-S, S}});
	f |= its(L, {{-S, S}, {S, S}});
	f |= its(L, {{S, S}, {-S, -S}});
	f |= its(L, {{-S, S}, {S, -S}});
	return !f;
}

void dijk(int st) {
	// printf("start: (%d, %d)\n", T[st].D.X, T[st].D.Y);
	for(int i=0; i<K; i++) D[0][i] = D[1][i] = 1e9;
	D[0][st] = 0.0;
	priority_queue<node> pq; pq.push({0.0, 0, st});
	while(pq.size()) {
		node n = pq.top(); pq.pop();
		// printf("now: (%f, %d, (%d, %d))\n", n.v, n.c, T[n.id].D.X, T[n.id].D.Y);
		if(f(D[n.c][n.id] - n.v) > eps) continue;
		for(auto& it: adj[n.id]) {
			int tc = n.c;
			if(its({T[n.id].D, T[it.X].D}, I)) tc = 1 - tc;
			if(D[tc][it.X] > n.v + it.Y) {
				D[tc][it.X] = n.v + it.Y;
				pq.push({D[tc][it.X], tc, it.X});
			}
		}
	}
	ans = min(ans, D[1][st]);
}

int main() {
	scanf("%d%d",&N,&S);
	for(int i=1; i<=N; i++) {
		scanf("%lf%lf%lf%lf", &A[i].S.X, &A[i].S.Y, &A[i].E.X, &A[i].E.Y);
		T.push_back({A[i].S, i, 0});
		T.push_back({A[i].E, i, 0});
	}
	T.push_back({{S, S}, N+1, 0});
	T.push_back({{S, -S}, N+2, 0});
	T.push_back({{-S, -S}, N+3, 0});
	T.push_back({{-S, S}, N+4, 0});
	for(int i=1; i<=N; i++) {
		for(int j=0; j<T.size(); j++) {
			if(i == T[j].id) continue;
			pdd pu = push(A[i], T[j].D);

			if(ok({T[j].D, pu}) && on(A[i], pu)) {
				// puts("ok");
				T.push_back({pu, i, 1});
			}
			// else puts("not ok");
		}
	}

	K = T.size();

	// printf("K: %d\n", K);
	// for(auto& it: T) {
	// 	printf("position(%f, %f), id: %d, pushed?: %d\n", it.D.X, it.D.Y, it.id, it.ps);
	// }

	for(int i=0; i<K; i++) {
		for(int j=i+1; j<K; j++) {
			if(!ok({T[i].D, T[j].D})) continue;
			double d;
			if(T[i].id == T[j].id) d = 0;
			else d = dst(T[i].D, T[j].D);
			// printf("(%f, %f) <----> (%f, %f), cost: %f\n", T[i].D.X, T[i].D.Y, T[j].D.X, T[j].D.Y, d);
			adj[i].push_back({j, d});
			adj[j].push_back({i, d});
		}
	}

	for(int i=0; i<K; i++) {
		dijk(i);
		// chk[T[i].id] = 1;
	}
	printf("%.10f", ans);
	return 0;
}

Compilation message

fences.cpp: In function 'int main()':
fences.cpp:98:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int j=0; j<T.size(); j++) {
                ~^~~~~~~~~
fences.cpp: In function 'int CCWs(pdd, pdd, pdd)':
fences.cpp:26:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
fences.cpp: In function 'int main()':
fences.cpp:87:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&N,&S);
  ~~~~~^~~~~~~~~~~~~~
fences.cpp:89:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lf%lf%lf%lf", &A[i].S.X, &A[i].S.Y, &A[i].E.X, &A[i].E.Y);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
18.0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 2680 KB Output is correct
2 Correct 4 ms 2680 KB Output is correct
3 Correct 4 ms 2680 KB Output is correct
4 Correct 4 ms 2680 KB Output is correct
5 Correct 5 ms 2680 KB Output is correct
6 Correct 5 ms 2680 KB Output is correct
7 Correct 5 ms 2680 KB Output is correct
8 Correct 4 ms 2680 KB Output is correct
9 Correct 4 ms 2684 KB Output is correct
10 Correct 4 ms 2680 KB Output is correct
11 Correct 4 ms 2680 KB Output is correct
12 Correct 4 ms 2680 KB Output is correct
13 Correct 4 ms 2680 KB Output is correct
14 Correct 4 ms 2680 KB Output is correct
15 Correct 4 ms 2680 KB Output is correct
16 Correct 5 ms 2680 KB Output is correct
17 Correct 3 ms 2680 KB Output is correct
18 Correct 4 ms 2680 KB Output is correct
19 Correct 5 ms 2680 KB Output is correct
20 Correct 4 ms 2680 KB Output is correct

Subtask #2
33.0 / 33.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 2680 KB Output is correct
2 Correct 4 ms 2680 KB Output is correct
3 Correct 4 ms 2680 KB Output is correct
4 Correct 4 ms 2680 KB Output is correct
5 Correct 5 ms 2680 KB Output is correct
6 Correct 5 ms 2680 KB Output is correct
7 Correct 5 ms 2680 KB Output is correct
8 Correct 4 ms 2680 KB Output is correct
9 Correct 4 ms 2684 KB Output is correct
10 Correct 4 ms 2680 KB Output is correct
11 Correct 4 ms 2680 KB Output is correct
12 Correct 4 ms 2680 KB Output is correct
13 Correct 4 ms 2680 KB Output is correct
14 Correct 4 ms 2680 KB Output is correct
15 Correct 4 ms 2680 KB Output is correct
16 Correct 5 ms 2680 KB Output is correct
17 Correct 3 ms 2680 KB Output is correct
18 Correct 4 ms 2680 KB Output is correct
19 Correct 5 ms 2680 KB Output is correct
20 Correct 4 ms 2680 KB Output is correct
21 Correct 4 ms 2808 KB Output is correct
22 Correct 15 ms 2680 KB Output is correct
23 Correct 9 ms 2680 KB Output is correct
24 Correct 6 ms 2680 KB Output is correct
25 Correct 7 ms 2688 KB Output is correct
26 Correct 7 ms 2680 KB Output is correct
27 Correct 8 ms 2680 KB Output is correct
28 Correct 5 ms 2680 KB Output is correct
29 Correct 6 ms 2680 KB Output is correct
30 Correct 5 ms 2680 KB Output is correct
31 Correct 5 ms 2808 KB Output is correct
32 Correct 5 ms 2680 KB Output is correct
33 Correct 10 ms 2680 KB Output is correct
34 Correct 7 ms 2680 KB Output is correct
35 Correct 64 ms 2936 KB Output is correct
36 Correct 138 ms 3320 KB Output is correct
37 Correct 6 ms 2680 KB Output is correct
38 Correct 4 ms 2680 KB Output is correct
39 Correct 13 ms 2808 KB Output is correct
40 Correct 4 ms 2652 KB Output is correct
41 Correct 5 ms 2680 KB Output is correct
42 Correct 12 ms 2808 KB Output is correct
43 Correct 208 ms 3260 KB Output is correct

Subtask #3
0 / 49.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 2680 KB Output is correct
2 Correct 4 ms 2680 KB Output is correct
3 Correct 4 ms 2680 KB Output is correct
4 Correct 4 ms 2680 KB Output is correct
5 Correct 5 ms 2680 KB Output is correct
6 Correct 5 ms 2680 KB Output is correct
7 Correct 5 ms 2680 KB Output is correct
8 Correct 4 ms 2680 KB Output is correct
9 Correct 4 ms 2684 KB Output is correct
10 Correct 4 ms 2680 KB Output is correct
11 Correct 4 ms 2680 KB Output is correct
12 Correct 4 ms 2680 KB Output is correct
13 Correct 4 ms 2680 KB Output is correct
14 Correct 4 ms 2680 KB Output is correct
15 Correct 4 ms 2680 KB Output is correct
16 Correct 5 ms 2680 KB Output is correct
17 Correct 3 ms 2680 KB Output is correct
18 Correct 4 ms 2680 KB Output is correct
19 Correct 5 ms 2680 KB Output is correct
20 Correct 4 ms 2680 KB Output is correct
21 Correct 4 ms 2808 KB Output is correct
22 Correct 15 ms 2680 KB Output is correct
23 Correct 9 ms 2680 KB Output is correct
24 Correct 6 ms 2680 KB Output is correct
25 Correct 7 ms 2688 KB Output is correct
26 Correct 7 ms 2680 KB Output is correct
27 Correct 8 ms 2680 KB Output is correct
28 Correct 5 ms 2680 KB Output is correct
29 Correct 6 ms 2680 KB Output is correct
30 Correct 5 ms 2680 KB Output is correct
31 Correct 5 ms 2808 KB Output is correct
32 Correct 5 ms 2680 KB Output is correct
33 Correct 10 ms 2680 KB Output is correct
34 Correct 7 ms 2680 KB Output is correct
35 Correct 64 ms 2936 KB Output is correct
36 Correct 138 ms 3320 KB Output is correct
37 Correct 6 ms 2680 KB Output is correct
38 Correct 4 ms 2680 KB Output is correct
39 Correct 13 ms 2808 KB Output is correct
40 Correct 4 ms 2652 KB Output is correct
41 Correct 5 ms 2680 KB Output is correct
42 Correct 12 ms 2808 KB Output is correct
43 Correct 208 ms 3260 KB Output is correct
44 Execution timed out 1070 ms 52044 KB Time limit exceeded
45 Halted 0 ms 0 KB -