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input/code.cpp: In function 'int main()':
input/code.cpp:25:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d %d",&N,&M,&K);
                            ^
input/code.cpp:30:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d",&a[i]);
                     ^

#include <bits/stdc++.h>
#define MAXK 25

using namespace std;

int getColour (int num) {
	int val = num % 5;
	mt19937 mt(val);
    uniform_int_distribution<int> dist(0, 2);
    while (1) {
    	int res = dist(mt);
    	if (val == num) {
    		return res;
    	}
    	val++;
    }
}

int notColour (int c1, int c2) {
	return 3 - c1 - c2;
}

int main () {
	int N, M, K;
	scanf("%d %d %d",&N,&M,&K);
	int i, j;
	static int a[MAXK];
	for (j = 0; j < M; j++) {
		for (i = 0; i < 2*K+1; i++) {
			scanf("%d",&a[i]);
		}
		int c = getColour(a[K]);
		int l = 1;
		while (l <= K) {
			if (getColour(a[K-l]) != c) {
				break;
			}
			l++;
		}
		int r = 1;
		while (r <= K) {
			if (getColour(a[K+r]) != c) {
				break;
			}
			r++;
		}
		int res;
		if (l % 2) {
			res = c;
		} else {
			res = notColour(c, getColour(a[K+r]));
		}
		if (res == 0) {
			printf("A\n");
		} else if (res == 1) {
			printf("B\n");
		} else {
			printf("C\n");
		}
	}
	return 0;
}

Test 1

Group: 1

Verdict: UNKNOWN

Test 2

Group: 2

Verdict: UNKNOWN

Test 3

Group: 3

Verdict: UNKNOWN