OJ-Problems-Source/HDOJ/3921_autoAC.cpp

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#include <stdio.h>
#include <string.h>
#include <math.h>
#include <algorithm>
using namespace std;
struct Point
{
double x, y;
} node[201];
struct T_T
{
int id;
double dis;
} que[201];
double sx, sy;
double ans;
double dis[201];
double map[201][201];
int q[201][201], q2[201][201];
int n;
int m;
bool vis[201];
int ra, rb, rc, rd;
double rmin;
double rdis;
double dist(int i, int j)
{
return sqrt((node[i].x - node[j].x) * (node[i].x - node[j].x)
+ (node[i].y - node[j].y) * (node[i].y - node[j].y));
}
bool cmp(T_ a, T_ b)
{
return a.dis < b.dis;
}
void init()
{
for(int i = 0; i < m; i++) dis[i] = dist(i, m);
for(int i = 0; i < m; i++)
for(int j = i + 1; j < m; j++)
map[i][j] = map[j][i] = dist(i, j);
for(int i = 0; i < m; i++)
{
int temp = 0;
for(int j = 0; j < m; j++)
if(i != j)
{
que[temp].id = j;
que[temp].dis = dis[j] + map[j][i];
temp++;
}
sort(que, que + temp, cmp);
for(int j = 0; j < temp; j++)
q[i][j] = que[j].id;
}
for(int i = 0; i < m; i++)
{
int temp = 0;
for(int j = 0; j < m; j++)
if(i != j)
{
que[temp].id = j;
que[temp].dis = map[i][j];
temp++;
}
sort(que, que + temp, cmp);
for(int j = 0; j < temp; j++)
q2[i][j] = que[j].id;
}
}
void solve()
{
rmin = -1;
int a, b, c, d;
for(b = 0; b < m; b++)
if(!vis[b])
{
for(c = 0; c < m; c++)
if(!vis[c] && b != c)
{
int t = 0;
a = q[b][t];
while(vis[a] || a == c)
{
t++;
a = q[b][t];
}
t = 0;
d = q2[c][t];
while(vis[d] || d == a || d == b)
{
t++;
d = q2[c][t];
}
double cou = dis[a] + map[a][b] + map[b][c] + map[c][d];
double cdis = (dis[a] + dis[b] + dis[c] + dis[d]) / 4.0;
if(rmin < 0 || cou < rmin || (rmin == cou && cdis < rdis))
{
rmin = cou;
rdis = cdis;
ra = a, rb = b, rc = c, rd = d;
}
t = 0;
d = q2[c][t];
while(vis[d] || d == b)
{
t++;
d = q2[c][t];
}
t = 0;
a = q[b][t];
while(vis[a] || a == c || a == d)
{
t++;
a = q[b][t];
}
cou = dis[a] + map[a][b] + map[b][c] + map[c][d];
cdis = (dis[a] + dis[b] + dis[c] + dis[d]) / 4.0;
if(rmin < 0 || cou < rmin || (rmin == cou && cdis < rdis))
{
rmin = cou;
rdis = cdis;
ra = a, rb = b, rc = c, rd = d;
}
}
}
vis[ra] = 1;
vis[rb] = 1;
vis[rc] = 1;
vis[rd] = 1;
ans += rmin;
}
int main()
{
int T;
int cas = 1;
scanf("%d", &T);
while(T--)
{
scanf("%lf%lf", &sx, &sy);
scanf("%d", &n);
m = 4 * n;
for(int i = 0; i < m; i++) scanf("%lf%lf", &node[i].x, &node[i].y);
node[m].x = sx;
node[m].y = sy;
init();
ans = 0;
memset(vis, 0, sizeof(vis));
for(int i = 0; i < n; i++)
{
solve();
}
printf("Case #%d: %0.2lf\n", cas++, ans);
}
return 0;
}