Visa Inc. Software Developer interview questions

Got sent the OA. the first question was not too difficult. the second one wasnt difficult either but did take longer. the third and forth werre very difficult for me

HR interview was very delightfull and smooth Hr describes all about the compony and asked me question about my expirience in my field Also we talked about recruiting process and next steps Technical interview - Code challenge 4 algorithm questions - 2 easy 1 middle 1 hard