1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
| #include <iostream>
#include <cstdio>
#include <queue>
#include <climits>
#define inf INT_MAX
using namespace std;
typedef pair <int, int> PII;
typedef long long LL;
const int N = 210, M = 3e4 + 10;
PII dog[N], site[N];
int n, m, st, ed, d[N], cur[N];
int idx = -1, hd[N], nxt[M], edg[M], wt[M];
bool bfs()
{
for (int i = st; i <= ed; i++)
d[i] = -1;
d[st] = 0;
cur[st] = hd[st];
queue <int> q;
q.push(st);
while (!q.empty())
{
int t = q.front();
q.pop();
for (int i = hd[t]; ~i; i = nxt[i])
if (d[edg[i]] == -1 && wt[i])
{
cur[edg[i]] = hd[edg[i]];
d[edg[i]] = d[t] + 1;
if (edg[i] == ed)
return true;
q.push(edg[i]);
}
}
return false;
}
int exploit(int x, int limit)
{
if (x == ed)
return limit;
int res = 0;
for (int i = cur[x]; ~i && res < limit; i = nxt[i])
{
cur[x] = i;
if (d[edg[i]] == d[x] + 1 && wt[i])
{
int t = exploit(edg[i], min(wt[i], limit - res));
if (!t)
d[edg[i]] = -1;
wt[i] -= t;
wt[i ^ 1] += t;
res += t;
}
}
return res;
}
int dinic()
{
int res = 0, flow;
while (bfs())
while (flow = exploit(st, inf))
res += flow;
return res;
}
void add (int a, int b, int c)
{
nxt[++idx] = hd[a];
hd[a] = idx;
edg[idx] = b;
wt[idx] = c;
}
bool check (int x, int z1, int z2, int y)
{
LL a = z1 - site[x].first,
b = z2 - site[x].second,
c = z1 - site[y].first,
d = z2 - site[y].second;
LL t = 4 * ((a * a + b * b) * (c * c + d * d)),
h = 3 * (a * a + b * b + c * c + d * d ) - 8 * (a * c + b * d);
return t <= h * h;
}
int main ()
{
cin >> n >> m;
st = 0;
ed = n + m;
for (int i = st; i <= ed; i++)
hd[i] = -1;
for (int i = 1; i < n; i++)
{
add(st, i, 1);
add(i, st, 0);
}
for (int i = 1; i <= n; i++)
cin >> site[i].first >> site[i].second;
for (int i = 1, a, b; i <= m; i++)
{
cin >> dog[i].first >> dog[i].second;
for (int j = 1; j < n; j++)
if (check(j, dog[i].first, dog[i].second, j + 1))
{
add(j, i + n - 1, 1);
add(i + n - 1, j, 0);
}
}
for (int i = n; i < ed; i++)
{
add(i, ed, 1);
add(ed, i, 0);
}
cout << n + dinic() << endl;
for (int i = 1; i < n; i++)
{
cout << site[i].first << ' ' << site[i].second << ' ';
for (int j = hd[i]; ~j; j = nxt[j])
if (edg[j] != st && !wt[j])
cout << dog[edg[j] - n + 1].first << ' ' << dog[edg[j] - n + 1].second << ' ';
}
cout << site[n].first << ' ' << site[n].second;
return 0;
}
|