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int go(vector <int> v) {
	map<int, int> mp;
	for (auto i: v) {
		mp[i]++;
	}
 
	for (auto i: mp) {
		if(i.second>=2) cnt++;
	}
 
	if(cnt%2)	return mp.size()-1;
	return mp.size();
}

Main.java:1: error: class, interface, or enum expected
int go(vector <int> v) {
^
Main.java:3: error: class, interface, or enum expected
	for (auto i: v) {
	^
Main.java:5: error: class, interface, or enum expected
	}
	^
Main.java:9: error: class, interface, or enum expected
	}
	^
Main.java:12: error: class, interface, or enum expected
	return mp.size();
	^
Main.java:13: error: class, interface, or enum expected
}
^
6 errors

Standard output is empty