59. Scan Memory for Three Consecutive Increasing Values

#include <stdio.h>

int find_pattern(int *mem, int n) {
    
    for(size_t i = 0; i < n-3; i++){
        if( (*(mem+i) == (*((mem+i+1)) - 1)) && (*((mem+i+1)) == (*((mem+i+2))-1)) )
            return i;
    }

    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;
}