public class SampleExam {

    public static void main (String[] argv)
    {
	// You are encouraged to add your testing code here.
    }

    static int problem1 (int[] A, int[] B)
    {
	// Identify the day of maximum profit when A[i] = revenue 
	// on day i, and B[i] = cost on day i.

	// Temporarily:
	return -1;
    }

    static int[] problem2 (int[] A)
    {
	// Identify the elements in an array that have larger
	// elements on either side of them.

	// Temporarily:
	return null;
    }

    static boolean problem3 (String s)
    {
	// Check whether a word has two chars in sequence like "de" in "den"

	// Temporarily:
	return false;
    }

    static char[] problem4 (char[] letters, int m, int n)
    {
	// Extract part of the array letters from index m to index n,
	// including the letters at positions m and n.

	// Temporarily:
	return null;
    }

    static int problem5 (int n)
    {
	// The smallest k such that 1+3+5...+k crosses or reaches n

	// Temporarily:
	return -1;
    }

    static boolean problem6 (double[] A)
    {
	// Is A an array such that all positive values in A
	// are preceded by all the negative values in A?

	// Temporarily:
	return false;
    }

    static boolean problem7 (char[] A, char[] B)
    {
	// Is Array A contained as a sub-array of B? That is, the
	// chars in A occur in sequence as a subsequence in B?

	// Temporarily:
	return false;
    }

    static int[] problem8 (int[] A, int[] B)
    {
	// Create and return a new array that has all the elements in A
	// along with those elements in B that do not occur in A.
	// Your code must use arrays and only arrays.

	// Temporarily:
	return null;
    }

    static char[] problem9 (char[] A)
    {
	// Return a new array with all the chars in A such
	// that vowels are first and that, amongst the vowels,
	// the vowels occur in the same order as in A, and amongst
	// the consonants, they occur in the same order as in A.
	// Your code must use arrays and only arrays.

	// Temporarily:
	return null;
    }

    static int[] problem10 (int[] A)
    {
	// The array A has both positive and negative numbers.
	// Return a new array A with only the positive numbers.
	// Your code must use arrays and only arrays.
	
	// Temporarily:
	return null;
    }

}