Google Software Engineer interview questions

There was a series of very difficult interviews. So first I had to meet just to see if I was google material, if I fit the vibe, and then I had to do a series of difficult technical interviews back to back.

The reqruiter contacted me saying they wanted to employ someone with my background, and then let me prepare for 1-2 month on algorithm and data. Very basic sorting algorithms. I then prepared and joined the call. I initially thought it was going to be in English but was in Japanese (my native language). Other than conversational coding interview, the interviewer asked how to optimize it (to make it scale better, or run faster). Got the feedback saying that my understanding was all right, but my basic grammer (0-shifting and stuff) was not commendable.