这个题，要用floyd算法：
/*
ID: qq104801
LANG: C++
TASK: cowtour
*/
#include <iostream>
#include <fstream>
#include <cstring>
#include <vector>
#include <list>
#include <set>
#include <queue>
#include <cstdio>
#include <algorithm>
#include <cmath>
#define NMAX 151
#define z 1E-8
#define INF 9999999
using namespace std;
struct point
{
int x;
int y;
};
int n;
point p[NMAX];
double dd[NMAX][NMAX];
double distant(point a,point b)
{
return sqrt((a.x-b.x)*(a.x-b.x)+(a.y-b.y)*(a.y-b.y));
}
double diameter(int x)
{
double maxi=0;
for(int i=0;i<n;i++)
{
if(i==x)continue;
if(abs(dd[x][i]-INF)>z&&dd[x][i]>maxi)
maxi=dd[x][i];
}
return maxi;
}
void test()
{
freopen("cowtour.in","r",stdin);
freopen("cowtour.out","w",stdout);
cin>>n;
for(int i=0;i<n;i++)
{
cin>>p[i].x>>p[i].y;
//cout<<p[i].x<<" "<<p[i].y<<endl;
}
for(int i=0;i<n;i++)
for(int j=0;j<n;j++)
dd[i][j]=INF;
char c;
for(int i=0;i<n;i++)
{
getchar();
for(int j=0;j<n;j++)
{
fscanf(stdin,"%c",&c);
if(c==‘1‘)
{
dd[i][j]=distant(p[i],p[j]);
dd[j][i]=dd[i][j];
}
//cout<<c;
//if(j==n-1)cout<<endl;
}
}
for (int k=0;k<n;k++)
for(int i=0;i<n;i++)
for(int j=0;j<n;j++)
{
if( dd[i][k]+dd[k][j]<dd[i][j])
{
dd[i][j]=min(dd[i][j],dd[i][k]+dd[k][j]);
dd[j][i]=dd[i][j];
}
}
double maxi=INF;
double temp;
for(int i=0;i<n;i++)
for(int j=0;j<n;j++)
if(abs(dd[i][j]-INF)<z &&i!=j)
{
temp=distant(p[i],p[j]) + diameter(i)+diameter(j);
if(temp<maxi)maxi=temp;
}
for(int i=0;i<n;i++)
if(diameter(i)>maxi)maxi=diameter(i);
printf("%.6lf\n",maxi);
}
int main ()
{
test();
return 0;
}
test data:
USACO Training Grader Results 16 users online CAN/2 CHN/8 GBR/1 IND/1 KOR/1 TUR/1 USA/2 USER: cn tom [qq104801] TASK: cowtour LANG: C++ Compiling... Compile: OK Executing... Test 1: TEST OK [0.003 secs, 3552 KB] Test 2: TEST OK [0.005 secs, 3552 KB] Test 3: TEST OK [0.008 secs, 3552 KB] Test 4: TEST OK [0.005 secs, 3552 KB] Test 5: TEST OK [0.065 secs, 3552 KB] Test 6: TEST OK [0.081 secs, 3552 KB] Test 7: TEST OK [0.041 secs, 3552 KB] Test 8: TEST OK [0.059 secs, 3552 KB] Test 9: TEST OK [0.065 secs, 3552 KB] All tests OK. YOUR PROGRAM (‘cowtour‘) WORKED FIRST TIME! That‘s fantastic -- and a rare thing. Please accept these special automated congratulations. Here are the test data inputs: ------- test 1 ---- 8 10 10 15 10 20 10 15 15 20 15 30 15 25 10 30 10 01000000 10111000 01001000 01001000 01110000 00000010 00000101 00000010 ------- test 2 ---- 2 0 0 1 0 00 00 ------- test 3 ---- 4 0 0 1 0 0 20 1 20 0100 1000 0001 0010 ------- test 4 ---- 30 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 0 10 0 11 0 12 0 13 0 14 0 0 100 1 100 2 100 3 100 4 100 5 100 6 100 7 100 8 100 9 100 10 100 11 100 12 100 13 100 14 100 111111111111111000000000000000 111111111111111000000000000000 111111111111111000000000000000 111111111111111000000000000000 111111111111111000000000000000 111111111111111000000000000000 111111111111111000000000000000 111111111111111000000000000000 111111111111111000000000000000 111111111111111000000000000000 111111111111111000000000000000 111111111111111000000000000000 111111111111111000000000000000 111111111111111000000000000000 111111111111111000000000000000 000000000000000111111111111111 000000000000000111111111111111 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000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000110000000000000000000001000010010000000000000 Keep up the good work! Thanks for your submission!
时间： 2024-10-17 06:42:04