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#include <fstream>
#include <vector>
#include <cmath>
#include <cstring>
#include <algorithm>
#include <iomanip>
using namespace std;
 
ifstream F("hallway.in");
ofstream G("hallway.out");
 
const double eps = 1e-8;
 
typedef pair<int,int> pdd;
#define x first
#define y second
 
const int N = 1010;
 
vector<pdd> pt;
int n,m,k;
int ds[N][N];
int d[N];
int mk[N];
 
int dist(pdd a,pdd b)
{
    return (a.x-b.x)*(a.x-b.x)+(a.y-b.y)*(a.y-b.y);
}
 
int main()
{
    F>>n>>m>>k;
    for (int i=1;i<=k;++i)
    {
        int x,y;
        F>>x>>y;
        pt.push_back( make_pair(x,y) );
    }
    for (int i=1;i<=k;++i)
        for (int j=1;j<=k;++j)
            ds[i][j] = dist(pt[i-1],pt[j-1]);
    ds[0][k+1] = ds[k+1][0] = 1<<30;
    for (int i=1;i<=k;++i)
    {
        ds[0][i] = ds[i][0] = pt[i-1].y*pt[i-1].y;
        ds[i][k+1] = ds[k+1][i] = (m-pt[i-1].y)*(m-pt[i-1].y);
    }
    for (int i=1;i<=k+1;++i)
        d[i] = 1<<30;
    int n = 0;
    for (int i=1;i<=k+1;++i)
    {
        mk[n] = 1;
        int ans = 1<<30;
        for (int j=1;j<=k+1;++j)
            if ( !mk[j] )
            {
                d[j] = min(d[j],max(d[n],ds[n][j]));
                ans = min(ans,d[j]);
            }
        for (int j=1;j<=k+1;++j)
            if ( !mk[j] && d[j] == ans )
            {
                n = j;
                break;
            }
        if ( n == k+1 )
        {
            G<<fixed<<setprecision(8)<<sqrt(ans)/2<<'\n';
            return 0;
        }
    }
}
 

Main.java:1: error: illegal character: \35
#include <fstream>
^
Main.java:1: error: class, interface, or enum expected
#include <fstream>
         ^
Main.java:2: error: illegal character: \35
#include <vector>
^
Main.java:3: error: illegal character: \35
#include <cmath>
^
Main.java:4: error: illegal character: \35
#include <cstring>
^
Main.java:5: error: illegal character: \35
#include <algorithm>
^
Main.java:6: error: illegal character: \35
#include <iomanip>
^
Main.java:9: error: class, interface, or enum expected
ifstream F("hallway.in");
^
Main.java:10: error: class, interface, or enum expected
ofstream G("hallway.out");
^
Main.java:12: error: class, interface, or enum expected
const double eps = 1e-8;
^
Main.java:14: error: class, interface, or enum expected
typedef pair<int,int> pdd;
^
Main.java:15: error: illegal character: \35
#define x first
^
Main.java:15: error: class, interface, or enum expected
#define x first
        ^
Main.java:16: error: illegal character: \35
#define y second
^
Main.java:20: error: class, interface, or enum expected
vector<pdd> pt;
^
Main.java:21: error: class, interface, or enum expected
int n,m,k;
^
Main.java:22: error: class, interface, or enum expected
int ds[N][N];
^
Main.java:23: error: class, interface, or enum expected
int d[N];
^
Main.java:24: error: class, interface, or enum expected
int mk[N];
^
Main.java:26: error: class, interface, or enum expected
int dist(pdd a,pdd b)
^
Main.java:29: error: class, interface, or enum expected
}
^
Main.java:34: error: class, interface, or enum expected
    for (int i=1;i<=k;++i)
    ^
Main.java:34: error: class, interface, or enum expected
    for (int i=1;i<=k;++i)
                 ^
Main.java:34: error: class, interface, or enum expected
    for (int i=1;i<=k;++i)
                      ^
Main.java:37: error: class, interface, or enum expected
        F>>x>>y;
        ^
Main.java:38: error: class, interface, or enum expected
        pt.push_back( make_pair(x,y) );
        ^
Main.java:39: error: class, interface, or enum expected
    }
    ^
Main.java:40: error: class, interface, or enum expected
    for (int i=1;i<=k;++i)
                 ^
Main.java:40: error: class, interface, or enum expected
    for (int i=1;i<=k;++i)
                      ^
Main.java:41: error: class, interface, or enum expected
        for (int j=1;j<=k;++j)
                     ^
Main.java:41: error: class, interface, or enum expected
        for (int j=1;j<=k;++j)
                          ^
Main.java:43: error: class, interface, or enum expected
    ds[0][k+1] = ds[k+1][0] = 1<<30;
    ^
Main.java:44: error: class, interface, or enum expected
    for (int i=1;i<=k;++i)
    ^
Main.java:44: error: class, interface, or enum expected
    for (int i=1;i<=k;++i)
                 ^
Main.java:44: error: class, interface, or enum expected
    for (int i=1;i<=k;++i)
                      ^
Main.java:47: error: class, interface, or enum expected
        ds[i][k+1] = ds[k+1][i] = (m-pt[i-1].y)*(m-pt[i-1].y);
        ^
Main.java:48: error: class, interface, or enum expected
    }
    ^
Main.java:49: error: class, interface, or enum expected
    for (int i=1;i<=k+1;++i)
                 ^
Main.java:49: error: class, interface, or enum expected
    for (int i=1;i<=k+1;++i)
                        ^
Main.java:51: error: class, interface, or enum expected
    int n = 0;
    ^
Main.java:52: error: class, interface, or enum expected
    for (int i=1;i<=k+1;++i)
    ^
Main.java:52: error: class, interface, or enum expected
    for (int i=1;i<=k+1;++i)
                 ^
Main.java:52: error: class, interface, or enum expected
    for (int i=1;i<=k+1;++i)
                        ^
Main.java:55: error: class, interface, or enum expected
        int ans = 1<<30;
        ^
Main.java:56: error: class, interface, or enum expected
        for (int j=1;j<=k+1;++j)
        ^
Main.java:56: error: class, interface, or enum expected
        for (int j=1;j<=k+1;++j)
                     ^
Main.java:56: error: class, interface, or enum expected
        for (int j=1;j<=k+1;++j)
                            ^
Main.java:60: error: class, interface, or enum expected
                ans = min(ans,d[j]);
                ^
Main.java:61: error: class, interface, or enum expected
            }
            ^
Main.java:62: error: class, interface, or enum expected
        for (int j=1;j<=k+1;++j)
                     ^
Main.java:62: error: class, interface, or enum expected
        for (int j=1;j<=k+1;++j)
                            ^
Main.java:66: error: class, interface, or enum expected
                break;
                ^
Main.java:67: error: class, interface, or enum expected
            }
            ^
Main.java:71: error: class, interface, or enum expected
            return 0;
            ^
Main.java:72: error: class, interface, or enum expected
        }
        ^
55 errors

Standard output is empty