59. Scan Memory for Three Consecutive Increasing Values

#include <stdio.h>

int find_pattern(int *mem, int n) {
    int *ptr = mem;
    int *start = mem;
    int count = 1;

    ptr++;
    while(ptr < mem + n - 2)
    {
        if(*ptr == *start + count)
        {
            if(ptr == start + 2)
               return start - mem;
            count++;    
        }
        else
        {
            start++;
            count = 1;
        }
         
        ptr++;
    }
    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;
}