import java.util.Scanner; public class Main{ public static void main(String[] args) { Scanner in = new Scanner(System.in); int n = in.nextInt(); int[] result = new int[n*2]; for(int i=0;i<n*2;i++){ result[i] = in.nextInt(); } int count =0; int length = n<<1; for(int i=0;i<length;){ if(result[i]>>1 == result[i+1]>>1){ i += 2; continue; }else{ for(int j =i+1;j<length;j++){ int xuhao = result[i]>>1; int temp = result[i+1]; if(result[j]>>1 == xuhao){ result[i+1] = result[j]; result[j] = temp; count++; break; } } } } System.out.println(count); } }
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