Language: C++

/// kAAzuki Hoshino
/*
#pragma comment(linker, "/stack:200000000")
#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#pragma GCC optimize("unroll-loops")
*/
#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
#define int long long
typedef tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update>ordered_set;
typedef long double ld;
typedef vector<int> vi;
typedef pair<int,int> pi;
typedef vector<pi> vpi;
#define inf 1000000000
#define mod 1000000007
#define rep(i,a,b) for (int i = a; i <= b; i++)
#define rep1(i, a, b) for(int i =a; i >=b; i--)
#define dmp(x) cerr<<"line "<<__LINE__<<" "<<#x<<":"<<x<<endl
#define fs first
#define sc second
#define pb push_back
#define all(c) (c).begin(),(c).end()
#define mt make_tuple
template<class S,class T> ostream& operator<<(ostream& o,const pair<S,T> &p){
	return o<<"("<<p.fs<<","<<p.sc<<")";
}
template<class T> ostream& operator<<(ostream& o,const vector<T> &vc){
	o<<"{";
	for(const T& v:vc) o<<v<<",";
	o<<"}";
	return o;
}

int n,vis[1003];
ld dist[1003],x[1003],y[1003],r[1003],x1,y1;
vector<pair<int , ld>> adj[1003];

ld getdist( int i, int j ){
        return  sqrt(( x[i]-x[j] )*( x[i] - x[j] ) + ( y[i] - y[j] )*( y[i] - y[j] ) );
}

void djikstra( int s ){

priority_queue<pair<int , ld>> q;
q.push( {0, s} );
for(int i=1;i<=n+1;i++){
        dist[i] = 1e18;
}
while(!q.empty()){
        s = q.top().second;q.pop();
        if(vis[s])continue;
        vis[s]=1;
        for(auto t:adj[s]){
                if( dist[t.fs] > dist[s]+t.sc ){
                        dist[t.fs] = dist[s]+t.sc;
                        q.push({ -dist[t.fs], t.fs });
                }
        }
}

}

signed main(){
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
//freopen("input.txt", "r", stdin);
//freopen("output.txt", "w", stdout);
        cin >> x[0] >> y[0] >> x1 >> y1;
        cin >> n;
        x[n+1]=x1;
        y[n+1]=y1;
        for(int i=1;i<=n;i++){
                cin >> x[i] >> y[i] >> r[i];
        }
        for(int i=0;i<=n+1;i++){
                for(int j=i+1;j<=n+1;j++){
                        ld d =  max( (ld)0 ,  getdist( i, j ) - (r[i]+r[j]));
                        adj[i].pb( {j, d} );
                        adj[j].pb( {i, d} );
                }
        }
        djikstra( 0 );
        cout << fixed << setprecision(12);
        cout << dist[n+1] << endl;

return 0;
}
///....


Compiler output:
a.cc:41:42: error: 'ld y1' redeclared as different kind of entity
   41 | ld dist[1003],x[1003],y[1003],r[1003],x1,y1;
      |                                          ^~
In file included from /usr/include/features.h:523,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/os_defines.h:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/c++config.h:683,
                 from /usr/include/c++/14/cassert:43,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:33,
                 from a.cc:9:
/usr/include/x86_64-linux-gnu/bits/mathcalls.h:257:1: note: previous declaration 'double y1(double)'
  257 | __MATHCALL (y1,, (_Mdouble_));
      | ^~~~~~~~~~
a.cc: In function 'int main()':
a.cc:75:35: error: no match for 'operator>>' (operand types are 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} and 'double(double) noexcept')
   75 |         cin >> x[0] >> y[0] >> x1 >> y1;
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~ ^~ ~~
      |                             |        |
      |                             |        double(double) noexcept
      |                             std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}
In file included from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/usr/include/c++/14/istream:170:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(bool&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  170 |       operator>>(bool& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:170:7: note:   conversion of argument 1 would be ill-formed:
a.cc:75:38: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type 'double (*)(double) noexcept'
   75 |         cin >> x[0] >> y[0] >> x1 >> y1;
      |                                      ^~
/usr/include/c++/14/istream:174:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(short int&) [with _CharT = char; _Traits = std::char_traits<char>]' (near match)
  174 |       operator>>(short& __n);
      |       ^~~~~~~~
/usr/include/c++/14/istream:174:7: note:   conversion of argument 1 would be ill-formed:
a.cc:75:38: error: invalid conversion from 'double (*)(double) noexcept' to 'short int' [-fpermissive]
   75 |         cin >> x[0] >> y[0] >> x1 >> y1;
      |                                      ^~
      |                                      |
      |                                      double (*)(double) noexcept
a.cc:75:38: error: cannot bind rvalue '(short int)y1' to 'short int&'
/usr/include/c++/14/istream:177:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(short unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  177 |       operator>>(unsigned short& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:177:7: note:   conversion of argument 1 would be ill-formed:
a.cc:75:38: error: invalid conversion from 'double (*)(double) noexcept' to 'short unsigned int' [-fpermissive]
   75 |         cin >> x[0] >> y[0] >> x1 >> y1;
      |                                      ^~
      |                                      |
      |                                      double (*)(double) noexcept
a.cc:75:38: error: cannot bind rvalue '(short unsigned int)y1' to 'short unsigned int&'
/usr/include/c++/14/istream:181:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(int&) [with _CharT = char; _Traits = std::char_traits<char>]' (near match)
  181 |       operator>>(int& __n);
      |       ^~~~~~~~
/usr/include/c++/14/istream:181:7: note:   conversion of argument 1 would be ill-formed:
a.cc:75:38: error: invalid conversion from 'double (*)(double) noexcept' to 'int' [-fpermissive]
   75 |         cin >> x[0] >> y[0] >> x1 >> y1;
      |                                      ^~
      |                                      |
      |                                      double (*)(double) noexcept
a.cc:75:38: error: cannot bind rvalue '(int)y1' to 'int&'
/usr/include/c++/14/istream:184:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  184 |       operator>>(unsigned int& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:184:7: note:   conversion of argument 1 would be ill-formed:
a.cc:75:38: error: invalid conversion from 'double (*)(double) noexcept' to 'unsigned int' [-fpermissive]
   75 |         cin >> x[0] >> y[0] >> x1 >> y1;
      |                                      ^~
      |                                      |
      |                                      double (*)(double) noexcept
a.cc:75:38: error: cannot bind rvalue '(unsigned int)y1' to 'unsigned int&'
/usr/include/c++/14/istream:188:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  188 |       operator>>(long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:188:7: note:   conversion of argument 1 would be ill-formed:
a.cc:75:38: error: invalid conversion from 'double (*)(double) noexcept' to 'long int' [-fpermissive]
   75 |         cin >> x[0] >> y[0] >> x1 >> y1;
      |                                      ^~
      |                                      |
      |                                      double (*)(double) noexcept
a.cc:75:38: error: cannot bind rvalue '(long int)y1' to 'long int&'
/usr/include/c++/14/istream:192:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  192 |       operator>>(unsigned long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:192:7: note:   conversion of argument 1 would be ill-formed:
a.cc:75:38: error: invalid conversion from 'double (*)(double) noexcept' to 'long unsigned int' [-fpermissive]
   75 |         cin >> x[0] >> y[0] >> x1 >> y1;
      |                                      ^~
      |                                      |
      |                                      double (*)(double) noexcept
a.cc:75:38: error: cannot bind rvalue '(long unsigned int)y1' to 'long unsigned int&'
/usr/include/c++/14/istream:199:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  199 |       operator>>(long long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:199:7: note:   conversion of argument 1 would be ill-formed:
a.cc:75:38: error: invalid conversion from 'double (*)(double) noexcept' to 'long long int' [-fpermissive]
   75 |         cin >> x[0] >> y[0] >> x1 >> y1;
      |                                      ^~
      |                                      |
      |                                      double (*)(double) noexcept
a.cc:75:38: error: cannot bind rvalue '(long long int)y1' to 'long long int&'
/usr/include/c++/14/istream:203:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  203 |       operator>>(unsigned long long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:203:7: note:   conversion of argument 1 would be ill-formed:
a.cc:75:38: error: invalid conversion from 'double (*)(double) noexcept' to 'long long unsigned int' [-fpermissive]
   75 |         cin >> x[0] >> y[0] >> x1 >> y1;
      |                                      ^~
      |                                      |
      |                                      double (*)(double) noexcept
a.cc:75:38: error: cannot bind rvalue '(long long unsigned int)y1' to 'long long unsigned int&'
/usr/include/c++/14/istream:328:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(void*&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  328 |       operator>>(void*& __p)
      |       ^~~~~~~~
/usr/include/c++/14/istream:328:7: note:   conversion of argument 1 would be ill-formed:
a.cc:75:38: error: invalid conversion from 'double (*)(double) noexcept' to 'void*' [-fpermissive]
   75 |         cin >> x[0] >> y[0] >> x1 >> y1;
      |                                      ^~
      |                                      |
      |                                      double (*)(double) noexcept
a.cc:75:38: error: cannot bind rvalue '(void*)y1' to 'void*&'
/usr/include/c++/14/istream:122:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(__istream_type& (*)(__istream_type&)) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  122 |       operator>>(__istream_type& (*__pf)(__istream_type&))
      |       ^~~~~~~~
/usr/include/c++/14/istream:122:7: note:   conversion of argument 1 would be ill-formed:
a.cc:75:38: error: invalid conversion from 'double (*)(double) noexcept' to 'std::basic_istream<char>::__istream_type& (*)(std::basic_istream<char>::__istream_type&)' {aka 'std::basic_istream<char>& (*)(std::basic_istream<char>&)'} [-fpermissive]
   75 |         cin >>