59. Scan Memory for Three Consecutive Increasing Values

#include <stdio.h>

int find_pattern(int *mem, int n) {
    for (int i = 1; i < n - 1; i++) 
    {
        int prev = *(mem + i - 1);
        int current = *(mem + i);
        int next = *(mem + i + 1);

        if (current - prev == 1 && next - current == 1) 
        {
            return i - 1;
        }
    }

    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;
}