# C Exercises: Return maximum sum such that no two elements are adjacent

## C Array: Exercise-68 with Solution

Write a program in C to return the maximum sum such that no two elements are adjacent.

**Visual Presentation:**

**Sample Solution:**

**C Code:**

```
#include <stdio.h>
// Function to find the maximum sum of elements in an array such that no two elements are adjacent
int maxSumSubseq(int arr1[], int n) {
int incl = arr1[0]; // Initialize incl as the first element of the array
int excl = 0; // Initialize excl as 0, representing no elements chosen initially
int excl_new; // Temporary variable to store the updated value of excl
int i;
for (i = 1; i < n; i++) {
// Store the larger of incl and excl in excl_new
excl_new = (incl > excl) ?incl : excl;
// Update incl to the sum of the current element and excl
incl = excl + arr1[i];
// Update excl to the larger of previous excl and excl_new (which was either incl or excl)
excl = excl_new;
}
// Return the maximum of incl and excl as the final result
return ((incl > excl) ? incl : excl);
}
int main() {
int arr1[] = {1, 3, 5, 9, 7, 10, 1, 10, 100};
int n = sizeof(arr1) / sizeof(arr1[0]);
int i;
// Printing the original array
printf("The given array is : ");
for (i = 0; i < n; i++) {
printf("%d ", arr1[i]);
}
printf("\n");
// Finding and printing the maximum sum of non-adjacent elements in the array
printf("The maximum sum from the array such that no two elements are adjacent is: %d \n", maxSumSubseq(arr1, n));
return 0;
}
```

Sample Output:

The given array is : 1 3 5 9 7 10 1 10 100 The maximum sum from the array such that no two elements are adjacent is: 122

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