www.spoj.com/problems/BRCKTS/
This is another problem on Segment Trees. Although this is a basic/easy level problem.
In input a string of brackets will be given. The brackets can be open brackets or close brackets. Among
these words we will distinguish correct bracket expressions. These are
such bracket words in which the brackets can be matched into pairs such that
every pair consists of an opening bracket and a closing bracket
appearing further in the bracket word
for every pair the part of...
Unable to scan WhatsApp QR code ?
As you know that WhatsApp has released a web-version for its android, windows and ios WhatsApp app.
It is available on https://web.whatsapp.com/ .
But some users are not able to scan the QR code. So if you are one of them, you may try some of these steps -
1) Update your WhatsApp to the latest version availabe. This will most probably solve the issue.
2) Hold your phone still for some seconds. This may also be issue. So just hold your phone still for some seconds and let the QR code scanner...