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pku 3608



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鍏堥澶勭悊鎵鏈夊嚫鍖咃紝鐒跺悗dp銆?br>
 1#include<iostream>
 2#include<cmath>
 3#include<algorithm>
 4#include<complex>
 5#include<vector>
 6#include<stdio.h>
 7using namespace std;
 8typedef complex<double> point;
 9const int maxn = 530;
10const double eps = 1e-8;
11const double inf = 1e10;
12const double pi = acos( -1.0 );
13double dp[maxn];
14int c[10];
15bool cmp( point p1, point p2 )return real(p1) < real(p2) || real(p1) == real(p2) && imag(p1) < imag(p2); }
16double operator^( point p1, point p2 )return imag( conj( p1 ) * p2 ); }
17int dblcmp( double x )return x < -eps ? -1 : x > eps ; }
18double minn( double x, double y )return x < y ? x : y; }
19void convex_hull( vector<point> &p, vector<point> &poly )
20{
21    int sz = 0, i, k;
22    poly.clear( );
23    sort( p.begin( ), p.end( ), cmp );
24    for( i = 0; i < p.size( ); ++i )
25    {
26        while( sz >= 2 && dblcmp( poly[sz-2- p[i] ^ poly[sz-1- p[i] ) <= 0 )
27            poly.pop_back( ), sz--;
28        poly.push_back( p[i] );
29        sz++;
30    }

31    k = sz;
32    for( i = p.size( ) - 2; i >= 0; i-- )
33    {
34        while( sz > k && dblcmp( poly[sz-2- p[i] ^ poly[sz-1- p[i] ) <= 0 )
35            poly.pop_back( ), sz--;
36        poly.push_back( p[i] );
37        sz++;
38    }

39    poly.pop_back( );
40}

41
42int main( )
43{
44    double a[maxn], x, y;
45    int i, j, q, n, m, len, k = 1, sz;
46    vector<point> p, poly, poly1;
47    while1 )
48    {
49        p.clear( );
50        scanf("%d%d",&n,&m);
51        if( n == 0 && m == 0 )break;
52        for( i = 0; i < n; i++ )
53        {
54            scanf("%lf%lf",&x,&y);
55            p.push_back( point( x, y ) );
56        }

57        len = 1 << n;
58        for( i = 1; i < len; i++ )
59        {
60            poly.clear( );
61            poly1.clear( );
62            j = i; q = 0;
63            while( j )
64            {
65                if( j & 1 ) poly.push_back( p[q] );
66                q++
67                j >>= 1;
68            }

69            convex_hull( poly, poly1 );
70            sz = poly1.size( );
71            for( a[i] = 2 * pi * m, j = 0; j < sz; j++ )
72                 a[i] += abs( poly1[j] - poly1[(j+1)%sz] );
73        }

74        for( dp[0= 0.0, i = 1; i < len; i++ )
75            dp[i] = inf;
76        for( i = 0; i < len; i++ )
77            for( j = 1; j < len; j++ )
78                if( ( j & i ) == 0 )
79                    dp[i|j] = minn( dp[i] + a[j], dp[i|j] );
80        printf("Case %d: length = %.2lf\n",k++,dp[len-1]);
81    }

82    return 0;
83}
 
84


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fzu 1918 John鈥檚 Directionhttp://www.shnenglu.com/AmazingCaddy/archive/2010/06/01/116851.htmlAmazingCaddyAmazingCaddyMon, 31 May 2010 17:27:00 GMThttp://www.shnenglu.com/AmazingCaddy/archive/2010/06/01/116851.htmlhttp://www.shnenglu.com/AmazingCaddy/comments/116851.htmlhttp://www.shnenglu.com/AmazingCaddy/archive/2010/06/01/116851.html#Feedback0http://www.shnenglu.com/AmazingCaddy/comments/commentRss/116851.htmlhttp://www.shnenglu.com/AmazingCaddy/services/trackbacks/116851.html闃呰鍏ㄦ枃

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