Sukujuhla

#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

int main() {
	cin.tie(0);
	ios_base::sync_with_stdio(false);
	
	int n, m, k, o = 0;
	cin >> n >> m >> k;
	
	vector<int> v(2 * k + 1);
	
	for(int i = 0; i < 2 * k + 1; i++) {
		cin >> v[i];
		if(v[i] == 1) o = i % 2;
	}
	
	cout << ((o+k+1) % 2 == 0 ? "A\n" : "B\n");
}

Test 1

Group: 1

Verdict: UNKNOWN

Test 2

Group: 2

Verdict: UNKNOWN

Test 3

Group: 3

Verdict: UNKNOWN