What is Leetcode?

What is Leetcode?
Leetcode is an online platform to enhance your skills and prepare for tech interviews.
There site has over 1900 coding problems with questions to help you prepare.

Samsung A31 does not turn on after system update

1. Press volume down button + power button at same time for at least 10 seconds, release buttons when you see phone Logo and let it finish booting up.
2. If it still does not work, try a few more times, if it still does not work, try:
3. Plug in power cable and charge for a while, no matter battery sign shows or not. then with power cable plugged in, try step 1