All these codes were bulk uploaded, which is also many days later after actually writing them. So, I couldn't test them before uploading. As a result, there are few codes which are incomplete or gives a wrong solution. Please test the codes at first by submitting them in OJ before using them.
In practice, there are codes which I wrote to practice data structures and algorithms. There might be few incomplete/WA giving solutions.
In contest, there are codes of the contests which I actually participated. So, there are a lot of codes which I couldn't complete or gave Wrong Answer verdict.