I don’t understand why the editorials for some problems (probably harder) are missing? first exxample from april challenge - http://www.codechef.com/APRIL13/problems/STRQUERY - and for this month I’m presume they are not done all of them.
For some time they are here in forum - http://discuss.www.codechef.com/questions/8522/strquery-editorial .
thnks betlista!