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#include<iostream>
#include<cmath>
#include<cstdio>
using namespace std;
 
int n;
long long x[200005], y[200005], t[200005];
double dp[200005][2];
double dis(int P, int Q){
    return sqrt((x[P]-x[Q])*(x[P]-x[Q])+(y[P]-y[Q])*(y[P]-y[Q]))/(t[Q]-t[P]);
}
int main(){
    dp[0][0]=dp[0][1]=0;
    cin >> n;
    for (int l=0; l<n; ++l){
        cin >> t[l] >> x[l] >> y[l];
        if (l==0) continue;
        dp[l][0]=max(dp[l-1][0], dis(l-1, l));
        dp[l][1]=max(dp[l-1][1], dis(l-1, l));
        if (l==1) continue;
        //cout << dis(l-1, l) << endl;
        dp[l][1]=min(dp[l][1], max(dp[l-2][0], dis(l-2, l)));
    }
    cout << dp[n-1][1];
    //printf("%.8lf", dp[n-1][1]);
    return 0;
}
 

prog.cpp:1:2: error: stray ‘#’ in program
 t#include<iostream>
  ^
prog.cpp:1:1: error: ‘t’ does not name a type
 t#include<iostream>
 ^
In file included from /usr/include/c++/6/cmath:43:0,
                 from prog.cpp:2:
/usr/include/c++/6/ext/type_traits.h:162:35: error: ‘__gnu_cxx::__is_null_pointer’ declared as an ‘inline’ variable
   __is_null_pointer(std::nullptr_t)
                                   ^
/usr/include/c++/6/ext/type_traits.h:162:35: error: ‘bool __gnu_cxx::__is_null_pointer’ redeclared as different kind of symbol
/usr/include/c++/6/ext/type_traits.h:157:5: note: previous declaration ‘template<class _Type> bool __gnu_cxx::__is_null_pointer(_Type)’
     __is_null_pointer(_Type)
     ^~~~~~~~~~~~~~~~~
/usr/include/c++/6/ext/type_traits.h:162:21: error: ‘nullptr_t’ is not a member of ‘std’
   __is_null_pointer(std::nullptr_t)
                     ^~~
prog.cpp: In function ‘int main()’:
prog.cpp:14:5: error: ‘cin’ was not declared in this scope
     cin >> n;
     ^~~
prog.cpp:18:45: error: ‘max’ was not declared in this scope
         dp[l][0]=max(dp[l-1][0], dis(l-1, l));
                                             ^
prog.cpp:22:60: error: ‘min’ was not declared in this scope
         dp[l][1]=min(dp[l][1], max(dp[l-2][0], dis(l-2, l)));
                                                            ^
prog.cpp:24:5: error: ‘cout’ was not declared in this scope
     cout << dp[n-1][1];
     ^~~~

Standard output is empty