Scan Memory for Three Consecutive Increasing Values

Use *(pntr+2) to see for the required value. 

#include <stdio.h>

int find_pattern(int *mem, int n) {
    // Write your pointer-based logic here
    int i;
    for(i = 0; i<n-3 ; i++){
        if(*(mem+i)+2 == *(mem+i+2))
            return i;
    }
    return -1;
}

int main() {
    int n, arr[100];
    scanf("%d", &n);

    for (int i = 0; i < n; i++) {
        scanf("%d", &arr[i]);
    }

    int res = find_pattern(arr, n);
    printf("%d", res);

    return 0;
}

Solving Approach

iterate through all elements until n-2 , search for value and value +2 at index i and i+2 respectively.