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#include <iostream> // https://p...content-available-to-author-only...j.com/problems/AL_26_04/
using namespace std;
int tab[58]; 
int main(){
	int n;
	cin >> n;
	int a;
	int liczba;
	while(n--)
	{
		cin >> a;
		for(int i=0; i<a; i++)
		{
			cin >> liczba;
			tab[liczba+48]++;
		}
		for(int i=48; i<=57; i++)
		{
			if(tab[i]!=0)
			{
				if(tab[i]%2==1)
					cout << i-48<<endl;
			}
		}
		for(int i=48; i<=57; i++)
			tab[i]=0;
	}
}

Main.java:1: error: illegal character: '#'
#include <iostream> // https://pl.spoj.com/problems/AL_26_04/
^
Main.java:1: error: class, interface, or enum expected
#include <iostream> // https://pl.spoj.com/problems/AL_26_04/
         ^
Main.java:3: error: class, interface, or enum expected
int tab[58]; 
^
Main.java:4: error: class, interface, or enum expected
int main(){
^
Main.java:6: error: class, interface, or enum expected
	cin >> n;
	^
Main.java:7: error: class, interface, or enum expected
	int a;
	^
Main.java:8: error: class, interface, or enum expected
	int liczba;
	^
Main.java:9: error: class, interface, or enum expected
	while(n--)
	^
Main.java:12: error: class, interface, or enum expected
		for(int i=0; i<a; i++)
		^
Main.java:12: error: class, interface, or enum expected
		for(int i=0; i<a; i++)
		             ^
Main.java:12: error: class, interface, or enum expected
		for(int i=0; i<a; i++)
		                  ^
Main.java:15: error: class, interface, or enum expected
			tab[liczba+48]++;
			^
Main.java:16: error: class, interface, or enum expected
		}
		^
Main.java:17: error: class, interface, or enum expected
		for(int i=48; i<=57; i++)
		              ^
Main.java:17: error: class, interface, or enum expected
		for(int i=48; i<=57; i++)
		                     ^
Main.java:23: error: class, interface, or enum expected
			}
			^
Main.java:25: error: class, interface, or enum expected
		for(int i=48; i<=57; i++)
		              ^
Main.java:25: error: class, interface, or enum expected
		for(int i=48; i<=57; i++)
		                     ^
Main.java:27: error: class, interface, or enum expected
	}
	^
19 errors

Standard output is empty