ww.codechef.com/problems/REVWORDS why in this problem we are doing t++ please

[ssjgz]

It’s your code; you tell us!

Anyway, if you mean “why does it fail if I don’t do it” - because you haven’t read the first part of this post

My code is working fine on my cpu compiler but on codechef it shows wrong answers

Reading T won’t read the rest of the line after T, so the next call to getline will read the remaining characters after T until the end of the line. You need to skip the rest of the line after reading T: int T; cin>>T; // Skip to the next line. cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n'); After that, you’ll need to fix the potential out-of-bounds access on the line: else if (str[len-1]=='t' && str[len-2]== 'o' && str[len-3]== 'n' && str[len-4]== ' '…