59. Scan Memory for Three Consecutive Increasing Values

#include <stdio.h>

int find_pattern(int *mem, int n) {
    if(n < 3) {return  -1;}

    for(int i = 2; i < n; i++){
        int val1 = *(mem + i - 2);
        int val2 = *(mem + i - 1);
        int val3 = *(mem + i);

        if((val2 == val1 + 1) && (val3 == val2 + 1)){
            return (i - 2);
        }
    }

    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;
}