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#include <iostream>
#include <cmath>
using namespace std;
 
int main() 
{
 int a,b,c;
 cin>>a>>b>>c;
 if(a+b>c&&a+c>b&&b+c>a)
 {
  if(a*a + b*b==c*c||a*a+c*c==b*b||c*c+b*b==a*a)
   cout<<"Trojkat jest prostotatny";
  else
   cout<<"Trojkat nie jest prostokatny";
 }
 else
  cout<<"Trojkat nie istnieje";
}

Main.java:1: error: illegal character: '#'
#include <iostream>
^
Main.java:1: error: class, interface, or enum expected
#include <iostream>
         ^
Main.java:2: error: illegal character: '#'
#include <cmath>
^
Main.java:5: error: class, interface, or enum expected
int main() 
^
Main.java:8: error: class, interface, or enum expected
 cin>>a>>b>>c;
 ^
Main.java:9: error: class, interface, or enum expected
 if(a+b>c&&a+c>b&&b+c>a)
 ^
Main.java:13: error: class, interface, or enum expected
  else
  ^
Main.java:15: error: class, interface, or enum expected
 }
 ^
Main.java:18: error: class, interface, or enum expected
}
^
9 errors

Standard output is empty