programming-examples/c/Arrays/C Program to Find the Sum of Contiguous Subarray within a 1 – D Array of Numbers which has the Largest Sum.c

/*This C Program finds the sum of contiguous subarray within a 1 – D array of numbers which has the largest sum.*/

/*
 * C Program to Find the Sum of Contiguous Subarray within a 1 - D Array of Numbers which has the Largest Sum
 */
#include <stdio.h>
#include <stdlib.h>

int maxSubArraySum(int a[], int size, int *begin, int *end)
{
    int max_so_far = 0, max_end = 0;
    int i, current_index = 0;
    for (i = 0; i < size; i++)
        {
            max_end = max_end + a[i];
            if (max_end <= 0)
                {
                    max_end = 0;
                    current_index = i + 1;
                }
            else if (max_so_far < max_end)
                {
                    max_so_far = max_end;
                    *begin = current_index;
                    *end = i;
                }
        }
    return max_so_far;
}

int main()
{
    int arr[] = {10, -2, 15, 9, -8, 12, 20, -5};
    int start = 0, end = 0;
    int size = sizeof(arr) / sizeof(arr[0]);
    printf(" The max sum is %d", maxSubArraySum(arr, size, &start, &end));
    printf(" The begin and End are %d & %d", start, end);
    getchar();
    return 0;
}

/*
 The max sum is 56 The begin and End are 0 & 6