import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Objects;
class Solution {
public int solution(int[][] board, int[] moves) {
List<Integer> list = new ArrayList<>();
int count = 0;
for (int move : moves) {
for (int j = 0; j < board.length; j++) {
if (board[j][move - 1] != 0) {
list.add(board[j][move - 1]);
if (list.size() >= 2 && Objects.equals(list.get(list.size() - 2), list.get(list.size() - 1))) {
list.remove(list.size() - 2);
list.remove(list.size() - 1);
count++;
}
board[j][move - 1] = 0;
break;
}
}
}
return count*2;
}
}