Scan Memory for Three Consecutive Increasing Values

Code

#include <stdio.h>

int find_pattern(int *mem, int n) {
    int start = 0;

    for (int i = 1; i < n; i++) {
        if (*(mem + i) != *(mem + i - 1) + 1) {
            start = i;
        }

        if (i - start == 2) {
            return start;
        }
    }

    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;
}

Solving Approach