OJ Board

im some problems numbers are to be processed that cannot be stored in the variable with simple data types, e.g., volume 7 problem no. 748 how can these numbers be handled and processed

in many problems it is said that there will be a blank line ... how is blank line taken as input ... how can the enter key can be taken as input

similarly the other problem is that in some problems it is not mentioned that how the input will end what to do in that case

i wanted to get my program judged online but didnt have my user id ..... when i registered i didnt get any user id .......... wht shud i do now