Hey!

I am new to CP and I keep getting penalties for bad submissions during contests. In my last contest, I got 3, a heavy penalty... I know :/

It's usually a small thing that I missed before submitting (usually in the A and B problems) but I was wondering:

Do experienced CPs invest time in creating more test cases before submitting the code? any tips? ****

Sometimes creating test cases takes more than writing the solution. :/

Thxx