59. Scan Memory for Three Consecutive Increasing Values

#include <stdio.h>

int find_pattern(int *mem, int n) {
    // Write your pointer-based logic here
    if(!mem || n <= 0) return -1;

    int* p1 = mem;
    int* p2 = mem + 2;

    for(int i = 0; i < n - 2; i++) {
        if((*p1 == *(p1 + 1) - 1) && (*(p1 + 1) == *(p1 + 2) - 1)) return i;
        p1++;
        p2++;
    }

    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;
}