59. Scan Memory for Three Consecutive Increasing Values

#include <stdio.h>

int find_pattern(int *memory, int n) {
    int *p = memory;
    int *end = memory + n - 2;  // last valid start position

    while (p < end) {
        if (*(p + 1) == *p + 1 && *(p + 2) == *p + 2) {
            return (int)(p - memory);  // pointer → index
        }
        p++;  // move pointer
    }

    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;
}