Add Leetcode Solutions in cpp, Java

[aritrasen12345]

[aritrasen12345]

@restrictedCodex Please assign me this issue under 'Hactoberfest' label.

[ShubhamSj07]

@aritrasen12345 , pls go ahead & start adding ds algos 🙌🏻✨

[anujjain5699]

Please assign this issue to me

[Roshan5401]

I am good at dsa in cpp please assign me this under hacktoberfest i would like to contribute.