/**
 * 100/100
 * Kadane's algorithm
 * @param A
 * @return
 */
fun solution(A: IntArray): Int {
    var maxSlice = A[0]
    var maxEnding = A[0]
    /**
     * For each position, we compute the largest sum that ends in that position
     * If we assume that the maximum sum of a slice ending in position i equals maxEnding
     * then the maximum slice ending in position i equals max(A[i], maxEnding + A[i])
     * All this is basically an implementation of Kadane’s algorithm:
     * https://en.wikipedia.org/wiki/Maximum_subarray_problem#Kadane's_algorithm
     */
    for (i in 1 until A.size) {
        maxEnding = Math.max(A[i], maxEnding + A[i])
        maxSlice = Math.max(maxEnding, maxSlice)
    }
    return maxSlice
}

/**
 * A non-empty array A consisting of N integers is given. A pair of integers (P, Q), such that 0 ≤ P ≤ Q < N, is called a slice of array A. The sum of a slice (P, Q) is the total of A[P] + A[P+1] + ... + A[Q].
 *
 * Write a function:
 *
 * class Solution { public int solution(int[] A); }
 *
 * that, given an array A consisting of N integers, returns the maximum sum of any slice of A.
 *
 * For example, given array A such that:
 *
 * A[0] = 3  A[1] = 2  A[2] = -6
 * A[3] = 4  A[4] = 0
 * the function should return 5 because:
 *
 * (3, 4) is a slice of A that has sum 4,
 * (2, 2) is a slice of A that has sum −6,
 * (0, 1) is a slice of A that has sum 5,
 * no other slice of A has sum greater than (0, 1).
 * Write an efficient algorithm for the following assumptions:
 *
 * N is an integer within the range [1..1,000,000];
 * each element of array A is an integer within the range [−1,000,000..1,000,000];
 * the result will be an integer within the range [−2,147,483,648..2,147,483,647].
 */