59. Scan Memory for Three Consecutive Increasing Values

#include <stdio.h>

#define CONSECUTIVES 3

int find_pattern(int *mem, int n) {
    int pos = 0, count = 1;
    while (pos + CONSECUTIVES < n) {
        if (*(mem + pos + count) == *(mem + pos) + count) {
            count++;
        }
        else {
            count = 1;
            pos++;
        }

        if (count == CONSECUTIVES) return pos;
    }

    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;
}