Scan Memory for Three Consecutive Increasing Values

Code

#include <stdio.h>

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