Every contest, there are always people who get AC on Problem A within a minute literally before I’ve even finished reading the statement sometimes.

I’m really curious how to do it so fast. Do they just skim the input and output format and instantly understand the pattern? Or is there some trick or habit that helps code so quickly and confidently without overthinking?

To be honest, personally I’ve gotten lucky a few times by just looking at the input and output examples and guessing what the math formula was, but I am not sure if it's a good habit in the long run.

Would love to hear from some experienced contestants. How do you read and process problems so fast, and how do you practice writing code quickly while still being accurate?