Example: Sum of Elements in the ZigZag Sequence in a given Matrix in C using Recursion

// Sum of Elements in the ZigZag Sequence in a given Matrix in C using Recursion
#include <stdio.h>
#define MAX 100
#define max(a, b)(((a) > (b)) ? (a) : (b))

int zigZagSum(int arru[][MAX], int i, int j, int n) {
   	// If we have reached bottom 
    if (i == n - 1)
        return arru[i][j];

   	// It will find the largest sum in the sequence
    int zzs = 0;
    for (int k = 0; k < n; k++)
        if (k != j)
            zzs = max(zzs, zigZagSum(arru, i + 1, k, n));

    return zzs + arru[i][j];
}

int largestZigZag(int arru[][MAX], int n) {
   	// It will consider all cells of top row as starting point 
    int res = 0;
    for (int j = 0; j < n; j++)
        res = max(res, zigZagSum(arru, 0, j, n));

    return res;
}

int main() {
    int n = 3;
    int arru[][MAX] = {
		{43, 23, 67, 41},
        {15, 16, 17, 18},
        {19, 10, 11, 21},
        {23, 24, 25, 26}
    };
    // arru - denotes the input matrix to find the largest sum

    printf("The largest zigzag sum of the matrix is: %d\n", largestZigZag(arru, n));
    return 0;
}