Checklist

Have you spent time going through the examples carefully?
Have you read the constraints properly?
Are you clearing data in between test cases (if applicable)?
Are you checking for overflow (long long)?
Have you made sure there are no precision issues (double / long double not float, avoid floating point if not strictly needed)?
Are you printing doubles with the fixed and setprecision IO manipulators?
Have you submitted a slow solution to make sure it doesn't pass?
Have you stress tested with random case generation?
Have you used pen and paper?
- Have you gone through example test cases (solving as a human would)?
- Is there any pattern in how you're solving test cases on paper that could be generalized?
Are there any mathematical observations applicable to the problem?
Have you gone through all possible edge cases?

Provide feedback