Scan Memory for Three Consecutive Increasing Values

Code

#include <stdio.h>

int find_pattern(int *mem, int n) {
    int last = *mem++;
    int consec = 0;
    int i;
    for(i = 1; i < n; i++){
        if(*mem == (last + 1)){
            consec++;
            if(consec == 2){
                return (i - consec);
            }
        }else{
            consec = 0;
        }
        last = *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;
}

Solving Approach