59. Scan Memory for Three Consecutive Increasing Values

#include <stdio.h>

int find_pattern(int *mem, int n) {
    mem++;
    n -= 2;
    int idx = 0;
    while(n--)
    {
        if((*mem == *(mem-1) + 1) && (*mem == (*mem + 1) - 1)) return idx;
        idx++;
        mem++;
    }
    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;
}